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TEAM MECHANIKA’10 Head of Department Dr. Debabrata Chakraborty Faculty Advisor, MESA Dr. Niranjan Sahoo President, MESA Rohit Koolwal Vice President, MESA Bhushan Maskay Chief Editor Yash Dalmia Ashish Kumar Members :Adeel Ahmed Akshay Pasricha Anupam Singhal Ravish Vasan Shivam Mishra Gaurav Kapoor Rishi Garg Vasu Goel Paresh Goel Penumarthi Vivek Choudry N.R.Sreeram Designers :Rohit Sharma Shivanku Kumar

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Debabrata Chakraborty Professor & Head

Message from HOD

It is my pleasure to see that the Mechanical Engineering Students’ Association (MESA), IIT Guwahati has successfully brought out the fifth edition of MECHANIKA. I am also quite happy to note that the quality of MECHANIKA in terms of its organization and contents is improving with every passing edition. We must congratulate the student members of the editorial board for their commendable effort in this regard. The pages that follow will contain good number of articles covering topics ranging from purely technical articles on one hand and articles related to professional development on the other hand contributed by students, faculty members, alumni as well as personnel from industry. I am sure these will not only be useful for the students of Mechanical Engineering but also for others by providing information about some of the current developments in the field of Mechanical Engineering. Hope you all will enjoy reading this issue of MECHANIKA like the earlier issues and will contribute whole heartedly for successful future editions.

Dr. Niranjan Sahoo Faculty Advisor MESA

Message from Faculty Advisor I am delighted to see the fifth edition of annual department magazine MECHANIKA is published through Mechanical Engineering Students’ Association (MESA). It has been a constant effort by the executive members of MESA to make it a great success. This issue of the magazine contains interesting general and technical articles written by faculty members, alumni and students of the department. It also gives the general view of the outgoing students about the living culture in the institute. Moreover the thrust areas of research pertaining to different spectrum of Mechanical stream are also highlighted in this article. I take this opportunity to congratulate the editors, authors, members of MESA team for their endeavor. I wish that readers will find this magazine interesting that will boost moral support of MESA team for subsequent issues.

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Yash Dalmia E

Editor’s "A good engineer thinks in reverse and asks himself about the stylistic consequences of the components and systems he proposes." - Helmut Jahn. Four years here and all of us will be asking such questions to ourselves... Engineer is what I am soon going to be called by this sane world. But, amazingly

for the first time, last night while writing this letter I have made an effort to know what the term ENGINEER actually means. I always thought it is something that will get you respect and earn you a living. But it is now I realize how lopsided my perceptions had been. Dictionary meaning says ENGINEER means a person who is skilled in the principles and practice of any branch of Engineering but a TRUE ENGINEER is one who also knows how to interact with teachers, parents, friends, colleagues in class and at work and home. These skills required are what my teachers at IIT G have taught me. Four years back when we came here we were a pool of raw talent and energy. Last four years here at IIT Guwahati transformed that raw talent into skills and provided it with a positive direction. Now the onus is on us to go out and excel in our chosen fields. And I am sure we will do that and attain new heights and bring glory to our family and our Institute. Every year we have more and more talented and brighter people entering this college and

that makes us proud as individuals and as a team. The Mechanical Department is not different and now produces a batch of fine Mechanical engineers, yet again. This edition of Mechanika is a compilation of the expressions of the people associated with MESA and who are making us proud in every spheres of life. This year we not only have the contributions from the students, the alumni and the faculty but a special article from Respected Dr. Sahasrabudhe, the present Director, College of Engineering Pune, and member of the faculty IITG, mechanical department, has also graced our magazine. Alumni from various sectors have also penned down some thought provoking articles out of their experiences in the various sectors which will surely help the future passing out batches. This magazine covers experiences of interns, what does being an IITian mean, comparison between private and public sectors, amazing techniques revolutionizing our world, importance of soft skill development, placements, and several other informative ideas. In the end, I would like to congratulate all the students who have fared well in competitive examinations like CAT, GRE and GATE etc. Sky is the limit for these Proud IITians from Guwahati and we are equally proud of them. Best of Luck to all graduates of 2010 and May the blessings of almighty be always with you all.

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“Widely considered to be one of the most important archaeological artefacts ever found, it is the most

ANTIKYTHERA MECHANISM The Ancient Astronomical Computer Anupam Singhal UG II

One of the greatest discoveries of all times was made in 1901, when a group of divers working near the tiny southern Greek island of Antikythera, found in between the wrecks of an ancient Roman ship at a depth of 200 feet, several fine bronze and marble statues and remnants of a clock-like mechanism that was later found to be around 2,000 years old. Valerios StaĂŽs, an archaeologist at the National Museum, while examining these calcified lumps of corroded bronze, suddenly recognized among the broken

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statuary the fragments of a mechanism. By observing one of the corroded, inscribed plates that formed a major part of the Antikythera mechanism, he saw instantly that the inscription was ancient. The guesswork suggested it was an astrolabe, or a mechanical model of solar system or an astronomical clock.

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The Antikythera Mechanism, as it came to be known later, is widely considered to be one of the most important archaeological artefacts ever found and is the most sophisticated mechanism known from the ancient world. The mechanism was later identified as ancient mechanical computer designed to model astronomical phenomenon with remarkable accuracy, and its exact function still fascinates scholars till date. In the opinion of the epigraphers, it appears to be constructed upon theories of astronomy and mathematics developed by Greek astronomers, and the forms of the letters are those of the first century B.C. The dating is supported by the contents of the inscriptions and other remnants. The mechanism was initially kept in a wooden box, with a complex assembly of bronze gear wheels inside and dials on its outside. Its dials, gear wheels and inscribed plates were corroded and covered with a thick layer of calcified materials, and these enclosed so many details to figure out its reconstructions or conjectures. We could find vital clues to the true origins of the highly scientific technology by studying them which seemed unique to our modern civilization. The remains of the most complex scientific object are preserved at the Greek National Archaeological Museum in Athens. Nothing like this instrument is preserved elsewhere. It is a bit frightening to know that the ancient Greeks had come so close to our age in their thought as well as their scientific technology, just before the fall of their great civilization! It is evident that Greeks knew the principles of gearing, but it was employed only in simple applications like to change the angular speed or a

mechanical advantage, or to apply power through a right angle as in the waterdriven mill. Many archaeologists soon became involved in the long and difficult process of identifying the mechanism and determining its function. The object was of unique importance from the beginning and the gearing was impressively complex. The mechanism was identified as an astronomical device by analyzing the dials and the inscriptions. Some of the highest-tech imagery and a highly multidisciplinary team worked together to discover the mechanism’s function. However the research is far from complete, all the secrets of the mechanism haven’t been relinquished yet. Despite the efforts made in the first half of the century to clean up the calcified materials over its surface, the research over the last half century has began to reveal the concealed secrets. Many innovative technologies including the latest X-ray analysis technique called linear tomography were used to study the internal structure of the mechanism and its complex and confusing gear trains. The four approaches used to arrive at the answer were knowing the details of the mechanism, reading of the dials, understanding the inscriptions, and if we could relate to anything of similar mechanism. The geared wheels in the mechanism were mounted on a bronze plate. Some structural features of the mechanism deserve special attention. All the metal parts of the machine seem to have been cut from a single sheet of low-tin bronze about two millimetres thick; no parts were cast or made of another metal. All the gear wheels were made with teeth of the same angle (60

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4    ) ‚ degrees) and size, so that any wheel could mesh with any other. The strong evidence that the machine actually worked comes from the signs of repairing the machine at least twice. The casing was provided with three dials, one at the front and two at the back. The front dial provides the only known extensive specimen from antiquity of a scientifically graduated instrument. On measuring the accuracy of the graduations under the microscope, the average error over the visible 45 degrees was found to be about a quarter of a degree. The dial was fitted exactly over the main driving-wheel, which turned the pointer by means of an eccentric drum-assembly and showed the annual motion of the sun in the zodiac. It also showed the risings and settings of bright stars and constellations throughout the year. The back dials are more complex and less legible and probably indicated the main lunar phenomena of phases and times of rising and setting. At least four large areas of inscription were depicted in the fragments of the original instrument. Olympiad dial provides a novel clue to the origin of the mechanism by representing the six sets of games named on the dial, four of them, including the Olympics were major games known across the Greek world. The Antikythera Mechanism Research Project discovered the word "Olympia" on a bronze dial in 2008. When a date was entered via a crank, the Antikythera Mechanism would unveil the position of the sun, moon, or other astronomical information such as the location of other planets. This ancient astronomical calculator used the 365-day Egyptian calendar and could be adjusted to compensate for the effect of the extra quarter-day in the solar year.

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This mechanism is certainly very similar to the great astronomical cathedral clocks that were built in Europe. The scientific instrument-makers evolved from the clockmakers during Renaissance period and there are evidences to the fact that the clock that evolved to indicate the time was started as an astronomical showpiece. The Islamic devices play a key role in putting the whole story together, and demonstrated that it is through ancestry and not mere coincidence that the Antikythera mechanism resembles a modern clock. This knowledge was developed and transmitted by the Arabs to medieval Europe, where it became the foundation for subsequent inventions in the field of clockwork. Some quite a few young and old replicas of the Antikythera Mechanism have been developed, the oldest one by Robert Deroski; one by Michael Wright who has built a fully-working model of the mechanism using traditional methods; and a model by Mogi Massimo Vicentini. Derek De Solla Price, (1974),stated that “The differential turntable is certainly the most spectacular mechanical feature of the Antikythera device because of its extreme sophistication and lack of any historical precedent�. In 1971, he gave the general plan of gearing and the almost complete description of the device functioning, by viewing the remnants of the mechanism

with gamma rays, which could penetrate the gears embedded in the calcareous blocks. The careful counting of teeth and examination of the way the gears meshed revealed that the gear ratios could be associated with well-known astronomical and calendrical parameters. This box contained around 32 gears assembled to form a mechanism, for accurately reproducing the motion of the sun and the moon against the background of fixed stars. Although, the reconstruction mechanism developed by Price had to face some controversies afterwards. The Antikythera Mechanism Research Project, which is an international collaboration of academic researchers, supported by some of the world's best hightechnology companies, aims to completely reassess the functions and importance of the Antikythera Mechanism.The project has received strong support from the National Archaeological Museum in Athens, which is the custodian of this unique astronomical computer. This project organizes conferences to present the recent research findings. The Antikythera device is truly a unique piece that forces us to consider that our knowledge of ancient science and technology is rather limited and poses a difficulty to believe that the Antikythera device is a unique piece of antiquity and the most advanced that survived.

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A Mechanical Engineer’s Dream What is that? Am I seeing a photon? I think I am. Am I travelling with the speed of light? What’s happening? Did science make the miracle possible? Isn’t it astounding? As far as I know, until now the fastest human made object is the New Horizon, NASA built a spacecraft which is on its way to Pluto. Its speed is only around 17.0993 km/sec. Then how am I able to travel with speed of light (3, 00,000 km/sec)? Did I actually disprove Einstein’s Theory of relativity? How is, a massive man like me, able to travel with speed of light? As we know to travel with speed of light one’s mass should tend to zero. New Horizon also with the mass of 478 kg is not able to do so? How am I able to do it? My main concern is the speed? I am not able to understand how I achieved it. How did I surpass the New Horizon’s mechanisms which made it the fastest one? It had a huge launch thrust of 9 MN which came from the five solid boosters of Atlas V 551 rocket of Boeing Star 48B third stage, of which major thrust came from the Russian RD-180 Engine with a thrust force of 4.152 MN. I even surpassed the RD-180 Engine which is fuelled by a kerosene / LOX mixture and uses an extremely efficient, high-pressure staged combustion cycle. The engine is unique as it employs an LOX-rich preburner, unlike typical fuel rich US designs. The thermodynamics of the cycle allow the LOX-rich preburner to be more powerful per unit weight, but with the drawback, that high pressure, high temperature gaseous oxygen must be transported throughout the engine. The movement of its nozzles is controlled by four hydraulic actuators. It is a very large engine and is quite sturdy.

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I am ecstatic. So speed of light isn’t impossible. But speed of light is also limited to me. I can’t reach Andromeda our nearest galaxy even with the speed of light. It will take a massive 20, 00,000 years. So I have to travel with speed more than light. Yes, it’s decided. I will exceed the speed of light and achieve the unthinkable. ................................................................................................................................................. What was it, all a dream? But indeed it was a good one. Now my aim in my life is to attain the speed of light (first speed of light, a short term goal and later exceeding it, a very long term one).

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Kinetic Energy Recovery System N.R.Sreeram UG I

As a mechanical engineer, have you ever cared to think that how much energy gets wasted when you put your foot on the brake pedal of your vehicle? Ever wondered if we could actually harness that energy to use it constructively? K.E.R.S is the answer. As an advanced form of regenerative braking, it promises to store the energy usually lost during braking, in batteries or use it thereupon to help in accelerating the vehicle again. Though regenerative braking was developed in 1967 for the AMC Amitron (American Motor Company’s concept car whose batteries were charged entirely by regenerative braking), K.E.R.S as a system was recently developed and implemented in F1 racing cars. Energy can be stored in the form of mechanical energy (as in a flywheel) or in form of electrical energy (as in a battery or capacitor).

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11 In the electrical mechanism, during deceleration of the car, the rotational energy of the car is used to run a dynamo (and sometimes a motor itself, which acts as both motor and dynamo) or a motor/dynamo system (MGU) which is attached to the crankshaft and converts this mechanical energy into electrical energy which can be stored in batteries for future use. This mechanism even aids in the braking as the dynamo magnets exert a force on the wheels which acts as another retarding force for the wheel. Using batteries also has a flip side – they can get extremely hot and most cars which use it require extra cooling mechanisms to make it work smoothly. To resolve this, BMW came up with the idea of using super-capacitors, instead of batteries to store the energy. According to experts, the Mechanical K.E.R.S system provides a more efficient and environment-friendly solution for the problem – partly because there is no change in state of the energy being re-used. It uses a flywheel to store the kinetic energy of the wheel which is then fed back to the wheels during acceleration on the press of a button. Like any flywheel system, to make it small, compact and energy efficient, the speed should be very high –somewhere in the order of 50000-100000 rpm. The only way this can be done, minimizing windage losses and without considerable losses in heat is to run the whole system in vacuum. The components within each variator (i.e. each system) include an input disc and an opposing output disc. Each disc is formed so that the gap created between the discs is ‘doughnut’ shaped; that is, the toroidal surfaces on each disc form the toroidal cavity.

Two or three rollers are located inside each toroidal cavity and are positioned so that the outer edge of each roller is in contact with the toroidal surfaces of the input disc and output disc. As the input disc rotates, power is transferred via the rollers to the output disc, which rotates in the opposite direction to the input disc. The angle of the roller determines the ratio of the Variator and therefore a change in the angle of the roller results in a change in the ratio. So, with the roller at a small radius (near the centre) on the input disc and at a large radius (near the edge) on the output disc, the Variator produces a ‘low’ ratio. Moving the roller across the discs to a large radius at the input disc and corresponding low radius at the output produces the ‘high’ ratio and provides the full ratio sweep in a smooth, continuous manner. The transfer of power through the contacting surfaces of the discs and rollers takes place via a microscopic film of a specially developed long-molecule traction fluid. This fluid separates the rolling surfaces of the discs and rollers at their contact points. The input and output discs are clamped together within each variator unit. The traction fluid in the contact points between the discs and rollers becomes highly viscous under this clamping pressure, thereby increasing its ‘stickiness’ and creating an efficient mechanism for transferring power between the rotating discs and rollers. The energy from this second roller is then tapped and used for accelerating the car. A third approach is a hydraulic recovery system. The principle behind hydraulic KERS units, by contrast, is to reuse a vehicle’s kinetic energy by conducting pressurized hydraulic fluid into an accumulator during deceleration, then

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conducting it back into the drive system during acceleration. But it has its shortcomings too. One is the relatively low efficiency of rotary pumps and motors. Another is the weight of incompressible fluids. And a third is the amount of space needed for the hydraulic accumulators, and their awkward form factor. None of this matters too much in, say, heavy commercial vehicles but it makes this option not so suitable for road and racing cars. Thus, the F1 teams dropped the idea of using a hydraulic system and relied more on the electrical and mechanical systems which make up most of the K.E.R.S systems used today. This is used in F1 racing cars as a way to aid the acceleration of the driver, immediately after braking – like during a turning, when the driver has to decelerate, and again, immediately accelerate. To maintain uniformity in the game, there are certain rules regarding how much power can be tapped from this system and how much can be stored. The current rules provide for a maximum of 60kw (approx. 80bhp) to be conveyed from the system which can be used for a maximum of 6.67 seconds per lap. This can all be used in one go, or in separate intervals. Another limitation in the use of K.E.R.S is that its entire equipment set weighs around 35kg, which is a backdrop as it reduces the ballast weight from around 70kg to around 30 kg – reducing the freedom to vary the car’s weight distribution. This has been partly tackled by increasing the weight limit of cars by 15-20kg in the 2010 season of F1.

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The regulations also stipulate that the release must be completely under the driver’s control. There is a boost button on the steering wheel which can be pressed by the driver to activate the system. Also, this technology has been developed by many companies in their own different styles. There is Magneti Marelli, which developed the electric system of using a battery/generator unit to store the energy; another is Ian Foley who developed the Electro-mechanical system; and Fybrid which developed the ingenious mechanical system which uses a pair of flywheels to transfer the energy. This technology is currently under development for domestic cars and if successful can improve energy efficiency and fuel consumption of automobiles, contributing to a greener and brighter future for mankind.

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Bajaj Pulsar

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DTSi Engine Technology

The Bajaj Pulsar was launched in India in 2001, developed by Bajaj Auto and Tokyo R&D. It has gone on to become one of the most successful motorcycles of India. Motorcycles of the Pulsar brand sell around 50,000 units every month. By March 2005, more than a million Bajaj Pulsars had been sold. As of now, the Pulsar brand of Baja Auto includes motorcycles with 4 different engines, with capacities of 135cc, 150cc, 180cc and 220cc. All these engines share Bajaj’s patent in India: DTSi technology or Digital Twin Spark Ignition Technology. Bajaj’s DTSi technology basically involves usage of two spark plugs for a single cylinder engine. Using two spark plugs means that the combustion inside the cylinder is initiated at two different locations rather than one. This helps in ensuring better overall combustion of the fuel inside the cylinder, and thus improving the power output, lowering fuel consumption and lowering emissions.

14 Though the usage of two spark plugs for every cylinder is patented by Bajaj Auto in India, this technology is almost as old as the automobile itself. Two spark plugs for every cylinder have been used by many engine manufacturers over time. Alfa Romeo was one of the earliest to use two spark plugs on their grand prix cars in the 1910s. Alfa Romeo has also been one of the most prolific users of twin spark plug technology as well, having used it in racing cars in the 60s as well as using it on their road cars in the 1980s and 1990s. Other than Alfa Romeo, Mercedes Benz and Porsche have also used two spark plugs in many of their engines. Twin spark plugs were also common in aviation Otto engines. In India, twin spark plug engines were first introduced when BMW introduced its twin spark engines with its F650 Funduro motorcycles. More recently twin spark plug engines were used in the 2nd generation Honda City, where they were called i-DSI or intelligent Dual and Sequential Ignition; and also by TVS in their Flame and Royal Enfield in their Thunderbird motorcycles. Twin spark ignition technology was mainly utilised to achieve efficient and quick combustion of fuel in large capacity cylinders, especially with engines with large bores. This is because when the volume in which combustion is to take place is comparatively large, for complete combustion to take place a larger amount of time is required. With usage of two spark plugs at opposite ends of the cylinder instead of one centrally mounted spark plug, two flame fronts from opposite ends move towards the centre and thus combustion is completed in a smaller amount of time. Mostly twin spark plugs are used in cylinders with swept volume greater than 300cc. For example one of the most common twin spark engines are the Alfa Romeo twin spark engines. The

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smallest of these engines had a swept volume of about 400cc per cylinder. As mentioned,when twin spark engines were first used in racing cars, the swept volume of a single cylinder could be as high as 1500cc. This meant using two spark plugs was a very easy method to achieve fast and efficient combustion. Bajaj is one of the rare users of twin spark technology in small capacity engines. Usage of two spark plugs on smaller capacity cylinders also poses the problem of having to pack an extra spark plug on a smaller cylinder head. This is especially true for modern engines which generally have 4 valves, two for inlet and two for exhaust, per cylinder. Thus, usage of twin spark technology means the cylinder head has to accommodate 4 valves and 2 spark plugs. This made construction of such engines more complicated. Bajaj also used their DTSi technology with twin valve engines.

15 Only their most recently introduced 135cc engine incorporates both 4-valve and twin spark technologies. Alfa Romeo used twin spark plugs along with 4 valves on many of its production engines. But other manufacturers like Mercedes and Porsche used it with only 2 or 3 valve heads. Sometimes twin spark technology was also used when large valves meant that the spark plug could not be centrally located and hence, for uniform combustion, two spark plugs were used. Such a head is shown below. The cylinder head (object on the right) shows that there is no space between the two valves in the centre to place a spark plug, thus there are two spark plugs at the sides.

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In modern times twin spark technology is generally considered not very useful. This is largely because of the fact that with modern computer aided design it has become possible to design more efficient combustion chambers without having to resort to using two spark plugs. Thus production engines now rarely use two spark plugs, as that involves more complications in manufacturing of engine heads. There is also the complication of having to design the combustion chamber for two flame fronts. This also required the distributor to provide two sparks instead of just one. And sometimes, the design required that the two sparks not be delivered simultaneously, but sequentially.

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EARTHQUAKE REVISITED DON’T BE SCARED, RATHER BE PREPARED Ravish Vasan UG II

If a strong earthquake really occurs someday what willl be our status? us?

You are playing counter strike on your laptop in your room, and the game is boosting you up with excitement with all the killing and thrashing at its best. Suddenly, the water bottle placed at your side on the table starts shaking. At first, you neglect it as a thought due to your excitement illusioning you to feel the shudders of the bottle. But then, a mirror placed behind you on the wall falls on the floor with a bang! Now you are out of mind! Its an EARTHQUAKE!! You run out of the room as soon as possible with ground moving like a wave. As you come outside, you see panic and anxiety everywhere with-out any proper safety guidelines and you think “IF a strong earthquake really occurs someday what will be our status?” With this kind of preparedness, we will surely be mixed into the rubble within seconds and casualties will be so high that one couldn’t imagine. It is true in saying: “A man dead is a tragedy, but lots of dead becomes a statistics!” We all here stay in a high earthquake risk zone: ZONE 5 Now you might wonder what is this zone 5?? We always have a chance of a high intensity earthquake looming over our head every time. Moreover, Earthquake never strikes with a warning. So, “Its better to be prepared rather than scared”. A fact: There is a lot of difference between the earthquakes that occur in daytime and those which occur in the night, the reason being we are out of senses during night all that’s working is our subconscious mind(except some nocturnals like few among us) thus our reflexes are weak and casualties are much more. During daytime this is not a problem and we understand the situation easily and fast. So, some sort of early prepar-edness techniques might help us in reducing the risk factor due to earthquake ripple.

Earthquake Preparedness Techniques: 1) As matter of fact, most of the casualties in an earthquake are never due to direct effect of ground shaking, building falls or all those popular myths of being trapped and swallowed by earth. Rather it is due to the after effects of the quake viz. glass shatter-ing, cupboard fall, objects flying off etc. So, our prime concern should be to ensure safety within our room walls rather than seeing the bigger picture and sitting ducks till

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butcher comes to hunt. So, we need to have “earthquake eyes� watching out everything present in our room that may hurt us directly or indirectly. For example:

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Overdrive Mechanism *) F Q

Automobiles have become the lifeline of today’s world but has anyone ever wondered about the amount of fuel they consume?

One of the ways could be, looking at alternative renewable fuels. Research is on in this direction but in the meanwhile another approach to deal with this problem could be the introduction of a mechanism which could increase the fuel efficiency of the automobile thus reducing the fuel consumption. The introduction of the overdrive mechanism in the transmission system of automobiles is precisely a step in this regard. An overdrive is a device which is commonly used in automobiles to allow the choice of an extra -high overall gear ratio for high speed cruising, thus saving fuel, at the cost of less torque. Usually the final or top gear is called overdrive. Alternatively, it can also be stated as a combination of gearing inside the transmission system which results in the output speed being greater than the input speed thus increasing fuel efficiency. History The transmission systems were limited to three to five gears earlier where the need for a higher gear ratio for highway cruising was left unfulfilled. This was accomplished by the

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20 addition of separate overdrive units to simulate an extra gear. However, the transmissions manufactured lately tend to include the overdrive within the transmission. Working The overdrive consists of an electrically or hydraulically operated epicyclic gear train bolted behind the transmission unit. It can either couple the input driveshaft directly

to the output shaft (1:1), or increase the output speed so that it turns faster than the input shaft (1:1 + n). Thus the output shaft may be "overdriven" relative to the input shaft. In newer transmissions, the overdrive speed(s) are typically as a result of combinations of planetary/epicyclic gearsets which are integrated in the transmission. The overdrive is operated by an electric solenoid controlled by a switch, usually mounted on the steering column or on fascia panel. An inhibitor switch is invariably fitted in the electrical circuit to prevent engagement of overdrive in reverse and some or all of the indirect gears. The overdrive gears are epicyclic (planetary) and consist of a sunwheel, three planet gears and an internally toothed ring gear or annulus. All gears are in constant mesh. The planet carrier is attached to the input shaft. Carried on an extension of the sunwheel, a double sided cone clutch engages with a stationary brake ring or with the outside surface of the annulus. A uni-directional clutch (UDC) or freewheel connects the input and output shafts.

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21 The cone clutch is moved forward by hydraulic pressure in the operating cylinders, so that the outer friction lining of the clutch comes into contact with the stationary brake ring. As the cone clutch is attached to the sunwheel, both come to rest and the sunwheel becomes the reaction member for the planetary train. Since the planet carrier is splined to the input shaft and driven by it, the planet wheels orbit round the stationary sunwheel and in so doing, rotate the annulus and output shaft at a speed greater than that of the carrier and input shaft. The UDC enables the output member to rotate faster than the input member. When the overdrive is engaged, a shaft that is attached to the housing of the torque converter (which is bolted to the flywheel of the engine) is connected by clutch to the planet carrier. Both the small sun gear freewheels, and the larger sun gear is held by the overdrive band. There is only one input which comes from the converter housing. Now, the planet carrier is coupled to the input shaft, the ring gear to the output while the sun gear is held fixed. Gear Ratio = 1 / (1 + S/R) The typical value of gear ratio comes out to be around 0.67:1. So the output spins once for every two-thirds of a rotation of the engine. If the engine is turning at 2000

rotations per minute (RPM), the output speed is 3000 RPM. This allows cars to drive at freeway speed while the engine speed stays nice and slow. As already stated, using overdrive gearing reduces the engine’s RPM thus reducing engine wear and normally saving fuel however there is some debate over the overall efficiency of the overdrive gearing as it requires more moving parts than the normal 1:1 drive. The other difficulty is in the drive shaft rotation speed. Overall drivetrain reduction comes down to three basic factors: transmission gearing , differential gearing (in the axle), and tire size. The rotation speed problem comes into effect when the differential gearing is a high ratio and an overdrive is used to compensate. This may create unpleasant vibrations at high speeds and possible destruction of the driveshaft due to the centripetal forces or uneven balance. The higher speeds on the driveshaft and related parts can cause heat and wear problems if an overdrive and high differential gearing are combined, and create unnecessary friction. Therefore, the impetus is to minimize overdrive use and provide a higher ratio first gear, which means more gears between the first and the last to keep the engine at its most efficient speed. This is part of the reason that modern automobiles tend to have larger numbers of gears in their transmissions.

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Design Constraints and Technologies of Hypersonic Vehicle Design

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Vinayak Kulkarni Assistant Professor Department of Mechanical Engineering

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During these advancements, design criteria are evaluated for the flight vehicles according to the flow regime, which they are going to encounter. For example, design of subsonic vehicles is dominated by form drag due to flow separation. Therefore ‘streamlining’ is preferred to delay or avoid separation. As the flight vehicle crosses the sonic barrier, pressure on the forebody increases due to presence of the standing shock wave. Hence, drag force experienced by the vehicle increases. Since this high drag force is felt due to presence of the shock wave, it is called as wave drag and reduction of this wave drag becomes a main criterion in the design of a supersonic vehicle where flight speed is more than the local speed of sound. Forebody mounting of spike is the famous method to reduce this wave drag. As the flight speed increases further and becomes more than fivefold of the local sound speed, flight is said to be in hypersonic flow regime where flow around the spacecraft is dominated by dissociation, ionization, surface reactions etc. Excessive surface heating is the greatest concern in the design of ballistic missiles and spacecrafts flying in hypersonic regime. Typical temperature at the nose of the hypersonic vehicles, flying at a speed equal to the Apollo reentry speed, will be around 11,000 K. Hence, design of hypersonic vehicles is dominated by aerodynamic surface heating where ‘reduction of heat transfer rate’ plays an important role. Stagnation point aerodynamic heating varies inversely to the square root of the nose radius. Therefore, the blunt body configuration with detached shock wave, which experiences less heating than the traditional shape with attached shock wave, is chosen for hypersonic flight. Vehicles for the Mercury, Gemini, and Apollo programs

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were designed using this concept. Although bluntness is incorporated to reduce the heating load, the maximum temperature that a space vehicle experiences in its hypersonic flight is far above the maximum sustainable temperature of any material. Hence, a proper heat shield should be designed to withstand the heating loads. Consequently, imposed nose bluntness increases the aerodynamic drag experienced by the body. This increase in the wave drag is useful during reentry of the spacecraft for aero breaking. However, it is disadvantageous during the ascent stage, since increased wave drag demands for more fuel. Hence, for safer andcheaper hypersonic flight, different techniques for heat transfer and drag reduction have to be investigated. Cooling techniques to remove the thermal energy from the surface of a hypersonic spacecraft are broadly classified into two categories : active cooling and passive cooling techniques. ‘Radiative shielding’ (e.g. Molybdenum and Zirconium) and ‘Insulation’ (e.g. Dynaquartz) cooling are the most widely used techniques in the area of passive cooling. These techniques are used to avoid the oncoming heat to the vehicle and therefore they are called passive cooling techniques. ‘Convective cooling’, ‘ablative cooling’, ‘transpiration cooling’ and ‘film cooling’ are classified as ‘active cooling techniques’. These techniques are directly used to cool the vehicle surface. In this technique, the heat absorbed by the coolant is used to raise its sensible heat or to change coolants phase. In ‘ablation’ type active cooling, a layer of ablative material is coated over the surface to be protected. This protective layer melts and vaporizes due to absorption of large amount of thermal

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energy. Graphite and phenolic materials are currently popular ones for ablative materials. It is also found that the vehicles can be cooled efficiently by transferring coolant mass in the boundary layer from its surface. Mass transfer cooling, a type of active cooling technique, is an evolving solution to the aerodynamic heating problem. The field of mass transfer cooling can be further classified into ‘transpiration cooling’ and ‘film cooling’. In transpiration cooling, coolant mass is injected into the boundary layer from a porous surface of the vehicle, to introduce the coolant as a continuous mass like sweat coming out of the human body. The film cooling technique uses discrete holes for injection of coolant in the form of jets. Bluntness at the nose of the hypersonic vehicle is necessary to alleviate the oncoming heat load. However, increased wave drag is the immediate consequence of the forced bluntness. Fuel requirement of the spacecraft increases due to very large wave drag. Therefore, it is observed that, marginal change in the drag force produces drastic change in the range of the missile or payload of the vehicle. Hence, reduction of wave drag is currently an important field of research in the area of hypersonics. Numerous techniques have been developed for reduction of wave drag encountered by the space vehicle during its flight. Most of these techniques are centered on the alteration of the flow field near the stagnation region, since the stagnation region is the region of high pressure and high temperature fluid. Therefore, we can achieve drag reduction by pushing high pressure and high temperature fluid away from the body. One such technique which is generally used for wave drag reduction is the mounting of an aerospike at the nose of the space plane to push the bow shock away from the surface

to create low temperature and low pressure region near the nose to reduce drag and heat transfer. Research has also been carried out to obtain definite length of the aerospike to obtain maximum drag reduction. Spike of length equal to the base diameter of the hypersonic vehicle is seen to most efficient. Efficiency of the spiked body in drag reduction was seen to be enhanced by introducing exothermic reaction between shock and the hypersonic vehicle to push the forebody shock further away. Similar to the solid spike technique, injection of gas from the stagnation point is attracting the attention of the hypersonic community. The injected coolant forms a fluid spike at the stagnation point and lowers drag and heat transfer experienced by the vehicle. After the injection, coolant fluid expands to the total pressure behind the shock. So, length of the fluidic spike depends on the total pressure of the jet and total pressure of hypersonic flow behind the shock. Therefore optimum injection total pressure should be investigated for the given hypersonic flight to achieve maximum drag and surface heat transfer reduction. Another drag reduction technique is the deposition of energy upstream of the stagnation point to using on board or off board laser or by any nonconventional means to introduce a disturbance in the hypersonic flow. This highly concentrated energy spot changes the flow field around the spacecraft and reduces the overall drag. It has also been seen that coating of a particular material like chromium on the surface of the hypersonic vehicle also reduces drag by introducing exothermic surface reactions like formation of chromium oxide. Deposition of energy, in the presence of these reactions, manages to push the bow shock away from the body.

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Flapping Wings Technology ? ) 3 Q T Humans were always fascinated with the flight of birds, bats and flies for many centuries. When it comes to maneuvering efficiently through the sky, birds provide the best locomotive examples. From a Canadian goose’s response to wind gust and to speed control and target tracking of a seagull, from a “blackbird” travelling at 3200 Kilometers per hour and covering about 32 body lengths per second to a common pigeon that covers 120 body lengths in one second travelling at 120 KPH are just a few attributes that humans seek to develop in their design. One of the most discussed and researched upon characteristic of birds are their ability to maneuver through difficult flying conditions like during wind gusts, snow with the use of their flapping wings. And it’s a surprisingly simple process: To turn left, all a bird has to do is to flap its right wing a little bit harder than the left wing. To end the turn, the bird simply returns to flapping its wings in unison.Researchers find it extremely intriguing to see birds doing swift aerial movements gracefully, thus tempting them to mimic the movements in aircrafts and micro aerial vehicles (MAV). The primary reasons for such superior maneuvering and flight characteristics include the “scaling laws” with respect to a vehicle’s size, as well as intuitive but highly developed sensing, navigation, and control capabilities. While flapping, birds systematically twist their wings to produce aerodynamic effects in the same way as that the ailerons on the wings of conventional airplanes operate. Specifically, one wing is twisted downward (pronated), thus reducing the angle of attack (AoA) and corresponding lift, while the other wing is twisted upward (supinated) to increase lift. With different degrees of twisting between wings, a bird is able to roll. Their wings are not only lighter, but also have much more adaptive structures as well as capabilities of integrating aerodynamics with wing and body shapes, which change all the time. Birds surely have varied mechanical aspects which can be incorporated in engineering. Flapping flight is inherently unsteady, but that’s why it works so well. Birds, bats and insects fly in a messy environment full of gusts traveling at speeds similar to their own. Yet they can react almost instantaneously and adapt with their flexible wings.

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Technological Advancements

We have much to learn from looking carefully at how nature does things. Our bird-and-plane icon highlights one such eg: people succ-eeded in building flying machines by imitating nature. We can take inspiration from nature in solving our problems as we are doing research for just a few hundred years but nature is been at it ars. for 4 billion years.

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Researchers around the world like Wei Shyy, chair of the Aerospace Engineering department at Michigan University and an author of the new book “The Aerodynamics of Low Reynolds Number Flyers.� are trying to develop small flapping wing aircraft which would fly slower than conventional airplanes, but would be able to hover at one place and glide to increase fuel efficiency. Students of Wageningen University who developed a model “Roboswift� based their project on the specific flying properties of the swift bird which can remain in the air continuously for 7000 kilometers because of its continuously adaptive wings to the flying conditions and its ability to adjust its feathers in flying conditions. It changes several parameters simultaneously during morphing, including wing sweep, wind area, the local curvature of the wing (airfoil camber) and the wing slenderness (aspect ratio). The RoboSwift is characterized by the continuously variable shape of its wings, known as ‘morphing’ wings, which are modeled on the wings of the swift. These wings make the aircraft, like its living model, very maneuverable and efficient. As a result, the RoboSwift is the first aircraft in the world to have the wing properties of living birds. People have developed wind turbines with flapping wings as the blades to increase the efficiency of the system.

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MICRO AERIAL VEHICLES F 1 ` ^ Q T Of all the snazzy and sophisticated surveillance paraphernalia that movies have always flaunted, one of the most amazing is probably those tiny flying robots with video cams and other sensors (Remember even the SpyKids used them!) What is even more amazing is that, these tiny little robots are today gaining greater importance in defense research than even radar evasive aircrafts or self-repairing aircrafts. Micro Aerial Vehicle (MAV), a concept that started in 1996 by the Defense Advanced Research Projects Agency of the United States, had only one requirement – that its dimension should not exceed 15cm. The objective was to evolve it into a fully autonomous flight system capable of military surveillance and reconnaissance applications. However, it has been realized that this promising invention could as well be used in commercial, scientific, police and mapping applications mostly for remote observation of hazardous environments that are inaccessible to ground vehicles.

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The fabrication of the airplane-like fixed wing model is very similar to a conventional aircraft. However, simply scaling down the existing technology could create problems. For instance, the wingspan has to be shorter than the chord length owing to restrictions in dimensions and this poses many problems, such as high stall-angles of attack and nonlinear lift versus angle of attack characteristics. Also the small size makes the vehicle less robust and operable only at low speeds. MAV researchers and amateurs today are focusing on developing ornithopter-like flapping-wing models and helicopter-like rotary wing models. These are inspired by the flapping and adjusting of the wings of birds and other creatures of flight and the tiny robot’s movements are being modeled on those of a real fly. The flight dynamics are no doubt very complicated and the only motion that has been possible is tethering along a straight line or gliding up. But with fast paced innovations going on, the MAV community has reasons to believe that soon they will have a robot that can mimic the fly. The three models are used in different applications as per the need. Fixed-wing MAVs can currently achieve higher efficiency and longer flight times, so these are well suited to tasks that require extended loitering times, however they cannot hover or make the tight turns. Rotary-wings allow hovering and movement in any direction, at the cost of flight time. Flapping wings offer the most potential for miniaturization and maneuverability.

We are a just around the corner of another revolution of “Small Gadgets�. Any gue-sses what Genera-tion Next technology could be? I think it could be the Lethal MAVs of the SpyKids!! Kids!!

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NIKHIL CHANDRA BEHERA (Batch of 2007), ncbehera@gmail.com Company: Reliance Industries Limited , Jamnagar (Private, Oil Refinery) Work Profile: Reliability Engineer Work Ex: 2 Years 5 Months Working Divisions in RIL: Mechanical maintenance/ Engineering services section 1.corrosion and inspection group ,2. Rotating equipment group Working hours: 9 AM to 6 PM (6 days/week) Workload: Medium (depends on deadlines) Offered Package: 6.25 LPA(post training) In Hand Salary post training: 38K /month Growth Chart: Salary increment @5 to 6 % per annum until you get a promotion. Posting Sites offered: Jamnagar, Surat, Vadodara and Mumbai. Bond: No direct bond, but a lot of indirect ones. Exit options: It’s not easy to leave RIL!

KANAD SHAURYA (Batch of 2008), shaurya.iitg@gmail.com Company: IOCL, India (PSU, Oil Refinery) Work Profile: Refinery Division, Trainee Working hours: 8 AM to 5 PM (5 days/week) Workload: Heavy Offered Package: 7.6 LPA after 6th pay commission In Hand Salary at joining time: 31K/month Growth Chart: 3% basic salary growth Posting Sites offered: Panipat, Vadodara, Haridwar, Paradip, Guwahati Bond: 1 Lakh for 3 years Exit options: Other giant oil firms.

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Survey SOURABH AGARWAL (Batch of 2008), cynide123@gmail.com Company: Engineers India Limited (EIL) (PSU, TechnicalConsultancy) Work Profile: Design Engineer Work Ex: 1 Years 7 Months. Working hours: 8:30 am to 5:00 pm (5 days/week) Offered Package: Rs. 7.5 LPA In Hand Salary: 40K/month after training Growth Chart: Promotion rate: 3 yrs (except for training period) + increment 3% of basic + increment in DA. Posting Sites offered: Delhi (for campus recruits). Bond: None (as opposed to most of the PSU’s) Exit options: Bright. After 8-10 years, you can switch to any other engineering consultancy company.

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HEMANTH BOYAPATI (Batch of 2009), hemanth.boyapati@gmail.com Company: PricewaterhouseCoopers (PwC) (Private, Technical Consultancy) Work Profile: Consultant engineer. Area of work: SAP- Business Information Warehousing (BIW) Work Ex: 5 Months Working hours: Depends on working hours of the client. Offered Package: 4.5LPA In Hand Salary at joining time: 33K/month Posting Sites offered: Location ranging from metros to suburbs. Bond: None Exit options: Deloitte, KPMG and E&Y. Perks offered: You can move from place to place on a project via company funded flight tickets.

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Alumni DEEPAK KUMAR (Batch of 2007), dkgupta.iitg@gmail.com Company: Bentley Systems India Pvt Ltd (Private, Software Development Company) Work Profile: Software Engineer Work Ex: 3 years. Working hours: 9 AM to 6 PM (5 days/week) Workload: Chill (depends on deadlines) Offered Package: Above average Posting Sites offered: Pune Bond: None Exit options: CAD Company will be more suitable. However you could switch to any SW company.

SAGAR BALLARI (Batch of 2009), sagarballari2000@gmail.com Company: Dr. Reddy's Lab (Private, Pharmaceutical Company) Work Profile: Project Engineer (Process Improvement team) Work Ex: 9 months. Working hours: 9 AM to 6 PM (5 days/week) Workload: Medium Offered Package: 4.5LPA In Hand Salary at joining time: 31K/month Posting Sites offered: Hyderabad. Bond: None. Exit options: After 1 yr planning for some consultancy firm.

ASEEM BANSAL (Batch of 2008), meetaseem@gmail.com Company: NTPC Ltd. (PSU, Power Sector Company) Work Profile: Operation Engineer Work Ex: 1 Years 8 Months. Working hours: shift duty of 8 hrs (6 days/week) Workload: Chill Offered Package: 9 LPA after 6th pay commission In Hand Salary at joining time: 37K/month Posting Sites offered: Mostly remote areas. Bond: 2.5 Lakh for 4years. Exit options: Upcoming private sector Power companies like Reliance and TATA. Perks offered: Free accommodation, transport, electricity etc.

Survey VAIBHAV KUMAR (Batch of 2009), kumarvaibhav.iitg@gmail.com Company: Larsen & Toubro Limited(L&T) (Private, Construction Company) Work Profile: Management Trainee Work Ex: 9 months. Working hours: 8:30 AM to 5 PM (5 days/week) Offered Package: 4.25LPA In Hand Salary at joining time: 22K/month Growth Chart: Performance oriented (faster than other private firms/PSUs.) Posting Sites offered: Mumbai Corporate Office (IITians preferred) Bond: 2 Lakh for 2 years Exit options: Big International oil firms. Perks offered: Free accommodation for first 11 months. PLR: Performance linked revenue starting after 2 years of work. It’s a kind of bonus at the end of each financial year depending upon your performance.

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R V SIVA NIKHIL (Batch of 2008), sivanikhil.raavi@gmail.com Company: Schlumberger OFS, China (Private, Oil Exploration) Work Profile: Field Engineer Work Ex: 18 months. Working hours: on rig site- min. 14hrs/day & on base- 10hrs/day. Workload: Heavy Posting Sites offered: Global Bond: None Future prospects: Drilling Engineer or Directional Driller, Exploration operation management. Does Schlumberger look for good physique in students for OFS profile? : They don’t see any fitness to join OFS. Only thing that counts is presence of mind in pressure situations.

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Alumni Survey SHAMIT SHRIVASTAVA (Batch of 2008) shrivastava.shamit@gmail.com ; shamits@bu.edu Pursuing PhD, Boston University (USA) Research Theme: “Fundamental sciences of cell mechano-transduction� Course fee: $36000/year for avg. 5 years Incentives @ Boston Univ. : fellowships offering payment to all your expenses (any activity fee, health insurance,tuition etc.) + stipend & Excellent labs and international exposure! Research work done before going for PhD: Research Publications # Lab Chip, 2008, 8, 747 - 754, DOI: 10.1039/b718212k “Microcirculation within grooved substrates regulates cell positioning and cell docking inside microfluidic channels� co-first author #Biomaterials. 2007 Nov 12 "A microwell array system for stem cell culture." third author #3 other conference papers *CPI: 7.77 *GRE Score: 1330 (with an F Grade due to short attendance)

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After PhD: Expected Work Opportunity: As a Professor or jobs in biomedical firms Expected Package: $60000-$120000 E Ex

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“Room 143, Hostel Kapili. The plethora of opinions and ideas pouring out from 17 ingenious but anxious minds in the room clearly depicted that it was time for the much awaited placements. There were some passionate opinions while some were logical facts, and some folks had done an entire analysis on their gut feelings. The discussion was getting heated up with everyone trying to get to a consensus about what to opt for, PSU or Private Company but none seemed to arrive!� Sounding familiar?

From that day till today, I personally have gone through an exciting and commemorative journey and gained around 5 years of experience and thought to put it in form of this article. After graduating in mechanical engineering, from IITG, I joined Defense Research & Development Organization, as a Scientist. The motivation was that we are the fresh generation of engineers ready to take on the world and will do so while working for our own country. I was trained and placed at GTRE, which aims at developing Gas Turbine engines for LCA. During my stay there, I gained a good technical insight because there I got a chance to work on the most ‘cutting edge hardware’. It surely was a relaxed life there: fixed job hours, not much stress or deadline pressures, high incentives like concession on residence charges, food etc. The CTC to the organization seemed surely high but

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a disappointing fact was that the in-hand pay was much less compared to any Private sector company, especially in the IT sector. The career growth was pretty straight forward, wherein you will get promotions for sure, but mostly based on your time in the organization rather than your efforts or acumen. It felt like it was about whom you knew rather what you knew. Even though life was good and secure, there was a decline in further growth options and more challenges, so I decided to make a move to the US to pursue Masters in Industrial Engineering. My decision was based upon my sole career prospects but it is not easy to leave PSUs for there are many bonds and contracts which they make you sign while you are joining, so it is better to weigh the options when you are joining such a company.

constantly on the cutting edge, were some of the first impressions I got there. It surely was far from the relaxed life of public sector. The competition amongst the teammates was high, which did lead to some politics, but eventually you were rewarded for your work and made a visible mark in the organization. The initial hesitation I had while entering the IT sector was of having a different background than Computer Science, but what I found there was the fact that it was more of a game of problem solving and analytical skills because at the end of the day, even software engineering is about providing a solution for an issue and computer languages etc. are just tools to arrive at the solution. Private sector did offer the flexibility to change jobs, making it easier to relocate to a city of choice and better profiles/pay for the switch. This flexibility does offer us with the opportunity to see our future with a broader aspect and have a more challenging and rewarding career.

After graduating with MS, I joined finance sector for a small stint of time, but the long working hours, hectic deadlines and most importantly, the need of a second qualifica- This article is not about concluding the fact tion degree (or relevant certifications) to that which one is better over the other. It is grow in career made me switch to IT sector. just about sharing in-person learning. It depends upon you to choose what you The difference been private sector want. company and PSU was very evident the first day. Higher level of expectations, time Decide soon and go for it!! bound schedules and one’s need to be

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C H A N G E do we need one? an alumnus...

I’ve heard many say that one year out of college, life teaches you a lot more than what it did during the whole time you spent there! But, well I thought I learnt a lot more staying at that place rather than after having left it. You miss something a lot more when you know it’s never going to come back and for most of you out there reading this… those days aren’t too far! It’s during those moments that we look back at what has happened and try and see if things could have happened any differently… a little better? Or may be a little worse… You never know but, you’d wish to go back and tinker a couple of things in your life so that those little twists make your book the most interesting one. It happened to me too and having started working on my research I became a little too obsessed with it so, was thinking of how different things would have been may be if there were a couple of things that affected my life were changed. Drowned deep in my thoughts, I got an email asking me to write something for this issue of Mechanika and I thought why not share what I feel and if someone reads it and finds it reasonable then, may be it could make a difference! When we look back at our days as a student, given a chance everyone wants to say that things ‘could’ have been much different during our times… but, none of them will dare to say that things ‘should’ have been much different. There is a subtle difference between

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For some of those who are wondering if it was good or bad, it was damn GOOD, because mechanical engineers all over the world learn the same and again and again!

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the two things and I wish I understood this when I was in Guwahati. During our times at the insti we tend to look at the loopholes in the SYSTEM more often than we should and in the process forget to acknowledge the fact that what we actually have is something we must cherish. For all the kids out there who are planning to continue learning be it as a student or in an industry, believe me, what you are learning is the same as what others are learning around the world. There will always be a few guys walking around cribbing about the lack of a highly controlled vacuum for TEM measurements or a clean room for microfabrication or that their ideas go down the drain because we have little infrastructure. But, in reality the truth is that those students are not really good enough for what they actually want to work with (and believe me that is the hard reality). The lectures that we attend (now, I mean attend in the sense for learning and not for the sake of attendance) are on par with all those lectures at the big ones like MITs and Stanfords. But, then anyone who knew me would say that it’s the obedient student in me who wants to impress his proffs saying this and not someone speaking the truth. Well, go ahead keep reading I might actually impress you ;). I’ll try to come to the point straightaway, (just in case this short article was sounding to be like an excerpt from the discarded script written for Sheldon Cooper… it wasn’t supposed to be) should things have been much different to what they were? NO. Could things have been different from what they were…YES! That’s me speaking my mind regarding the system both in terms of the academics as well as the content that we end up learning. I am neither qualified nor experienced to throw

light on why the system is either good or bad, so, I am here to try and project my perspective which I hope might help someone at some point of time, if not overnight! The fact is that I have read everything my dad has read 36 years back as a Mechanical Engineer. I read that for three years and the fourth year was a little different, I read a little more than what my Dad did, basically because the scanning probe microscopy was introduced in 1985 and my Dad was out of college by then. So, you get the point? The stuff that I read during 80% of my undergrad was what was being taught and has been taught over and over through the years. For some of those who are wondering if it was good or bad, it was damn GOOD, because mechanical engineers all over the world learn the same old stuff again and again and again! So, why all the fuss? Well what I think could be worked on is that the remaining 20% of time which we normally spend in a lecture we had chosen for the sake of it being an easy one (Now you all know what I mean ;) ) Thanks to the huge amounts of resources on our LAN some of you might have seen Steve Jobs talk about how the Calligraphy class which he took is actually helping me in changing fonts in the process of typing this article. Its courses like those which can actually make you realize what you actually want to do… Not all of us want to work and earn money as the be all and end all of life… I know, I know you guys are much better than that! Before I talk any more… Something about me which would let you decide whether or not to read the article any further: I was one of those guys whose name, the profs knew… but, how he looked like? They didn’t. So, I wasn’t the flamboyant guys sitting in the first row

37 with the motive being impress the prof. I wasn’t a pain to have in a class and I wasn’t an asset to the prof either. You know what I mean! Fifty years since the IITs have been started and we still are a part of the developing nation! The fact is that we are just happy to be labeled developing. Some say there is brain drain some say IITians are less patriotic. Come on gimme a break guys, just out of college no one is hiring us in the US/Bahamas (couldn’t find a more exotic location at this time). It’s the students who want to learn more that are going abroad. They still have some penchant for going to classes and learning new stuff‌ So, let’s not blame them‌ if we can keep them home and provide them the resources that they are working for (not money! Grad students earn less than the unemployed in the United States :D, those who read phdcomics know what I am saying ;)) not many would have left. On a personal front, I wouldn’t have left either (for those who do not believe me, I was the weird guy who forwarded an intern in Germany just because a Prof. in Madras opened up his lab doors for me!). Before having joined the IIT, most of the yet to be IITians have a fetish (for the lack of a better term) for physics and so know a lot about Richard Feynman! Well the truth is that we know Feynman for only one of the many reasons he was actually famous for. Physics aside, Feynman’s lecture “There is plenty of room at the bottomâ€? could be regarded as the single most influential work for nanotechnology. As a matter of fact people recognized this about 40 years after he gave the lecture! Feynman as a matter of fact explains why it is important to scale down from macro to micro and how simpler certain complex

problems would be if we scale down to smaller lengths and how complex the simpler problems could become! Fifty years down the line only half of what he dreamed of has transpired into reality. But, how many of you know what he dreamed of? What has been achieved? I didn’t until a few months ago! But, what amazed me is that most of the undergrads whom I was supposed to teach were actually ahead of me when it came to learning about the most modern devices and the “in-thingsâ€? like they call them, in our research meetings even during our BTPs . That would be hard to digest for any of us who leave IITs with egos which have been fed by the junta praising IITs and our achievements over and over and over in the past few years of our lives! Why should we learn the less reliable new stuff when some of our teachers might feel it’s just a short living flame will be extinguished overnight? We need to learn that stuff not just because we want to be a stronger nation or because we want to match someone else’s standards. We need to learn new stuff to be ahead of your contemporaries. At the end of the day all that matters is what is in your repertoire. That, my friend sells more than anything else! For some of the brightest minds of the nation (well, it’s stuff like this that feed our egos :D I like to hear those too) it might seem like I am trying to be successful rather than trying to learn new stuff. Believe me buddy, to learn new stuff, to be ahead of your time‌ you need to be ahead of others not in terms of the marks we gained but, in terms of the amount of knowledge you accumulate. Things would be a lot different if the walls between different departments could be broken a little more often than what they are now. During my stay there, I

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MESA

could choose what I want to learn only after the third year well, that is great considering the fact that most other contemporary colleges do not provide us with a choice. But, even then, the options were a little too limited. I was always confused about the existence of a couple of Centers viz. Center of nanotech. And Center for environment. I felt they could be a part of what we are doing, may be by floating courses which could give an insight into how what we at Mech. Engg. Dept do, could be merged with what is being done there so as to come up with something really useful. On the brighter side it is not that the departments are resistant to change but, it’s just that when everything is fine the administration will not really want to tinker the parameters because they will be afraid of causing permanent harm to the products, which in this case being a student’s career! On the other hand it’s just plain common sense that if a student is working on a project as his BTP and is deemed to be worthy enough for completing it, then each one of his batch-mates are also competent enough to at least understand what he is working on. To put things into better words, if a twenty year old who cannot find the surface area of a cylinder is capable of learning about the forging processes using laser shocks at a micro-scale why can’t we? It’s just a matter of incorporating a few modifications into the way things are already present. Why can’t we use a Youtube video to show how Rolling or Extrusion actually works? The visual medium leaves a lasting impression on the mind more than anything else. I feel that technology could be made use of in a better way if students were able to visualize as to how

and why things work. Rather than looking up on ‘how stuff works’ or searching on Google before the deadlines, a student would be better off looking at a video about continuous rolling process and answer the questions during the exam. I, for that matter remember the ten minute documentary I saw in the philosophy class of second semester more than the iron-carbon phase diagram I saw on the wall, continuously for four days! It is just a matter of time before the way things are understood changes. I know this might benefit some and not everyone but, if at least half the class is able to grasp what has been taught during the lecture then, it must be regarded as a thumping victory for the instructor considering the levels of concentration we get to see from students during classes! Another possible implementation which I was always hoping for could be, allowing interested students take up self-initiated project for say three credits which allows them to explore what they are interested in. We know that some students already do projects during their second or third years, but the effort of the student could be justified even better provided he gets due credit for his efforts in terms of the credit hours he is gaining. This might actually help improve the interests of a couple of students (if not many) may be to a greater extent. I know it is not really worth taking the pain to look at the feasibility of all such things, but, to be frank such things would make our institute look a little apart from the rest if not by far! I always wondered how better it would be if we had a few more courses about material science as electives or if we had the OR course a little earlier rather than at the far end of our B.Tech. These were more

39 from a personal opinion rather than speaking for the entire community. So, there might be many such students who actually want some things but are rather afraid or lazy to voice their opinion. So, may be a one page feedback after every semester as to what is expected of the system rather than just the feedback for instructors could do a greater good, for those few students who have similar opinions. I have read articles on the internet and in newspapers where the big-wigs of India bad-mouth the brain drain and speak of trying to motivate students. Some went to the extent of saying that even if one student stays back then, they would be happy‌ If that is the truth then, why do we have to scrap a course if it has too few students? I don’t know if it still happens but, I was told during my time at Guwahati that a particular course which was floated the previous year shall not be floated during my final year just because of similar reasons. May be such things could be prevented because if at least one student is interested in learning what I want to teach, I will be happy that I can motivate that one student into the particular field of research. This, I think would give the students a greater opportunity to explore newer research objectives rather than those which have been tried and tested for years. For the classicists, I might sound like someone who is trying to speak good of the new things and undermine the gravity of the basic principles underlying engineering. But, I am plainly trying to reiterate the fact that even if Rohit or his great great great grand-father/grandmother (I am a feminist you see) saw an apple fall on their heads and talked about discovering a new force, no one would

care to give them credit for that. It is because the apple fell on Newton’s head even before anyone else’s and he thought about it first. It is as simple as that. We will be doing greater good to the nation by encouraging newer emerging fields even if the returns are not as good. So, why not embrace technology to a greater extent and incorporate videos into the lectures so as to illustrate the actual happenings‌ why not be the change that we seek in others and break the walls between different departments even further so as to float courses together‌ like a course on atomic force microscopy together with the Physics department... or an Artificial intelligence course together with the CS department. May be these would help churn out that one individual who can be the Newton and help throw more light on our institute and country than at present! It is just a question of how long before we see a change in the way things are done‌ because change however small or huge, is bound to happen!

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Placement Report MESA MESA

Below is the list of companies which visited IIT Guwahati during placement session 2009-10 and offered job to B.Tech Mechanical Engineering students. These companies have operations ranging from core mechanical to IT (with maximum placements in core companies).

#

$

!

Company

Sector

NTPC IOCL RIL Tata Motors Jindal Steel and Power MnM Dr. Reddy’s Labs L&T Infosys Energo GAIL SAIL BOC India Ltd. Sterlite technologies Coal India ltd. Qwest telecom EIL HAL

Power Oil Oil Automobile Steel Automobile F Manufacturing Business Analyst 2 Oil and natural gas Steel Manufacturing Manufacturing Energy IT Technical consultancy Manufacturing

9 3 4+4(PPO) 3 4 3 2 2 1 1 3 2 1 3 3 1 1 6

Total No. of Registered students- 53 Total No. of students placed- 49 Number of Jobs offered through PPO – 4 (RIL) Actual Number of Jobs- 56 Average Salary- 6.4 LPA** Highest Salary – 10.8 LPA

*Till 23rd April 2010 **Average salary may vary slightly Abhishek Kumar Department Placement Representative

43

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Rohit Koolwal sent me an email requesting me to write an article about expectations from an IIT graduate to be covered in the annual magazine, Mechanika of the department of mechanical engineering. I was a bit perplexed because it is more than three and a half years that I have been away from IIT Guwahati and the current final year students would have hardly known me. Then I thought, maybe “Three Idiotsâ€? must have refreshed the memories of another Sahasrabudhe. So let me put across a few lines which had crossed my mind ‌ Like most stories, this one starts a long time ago. While an unborn India was still struggling to free itself of British chains, a wise lady called foresight was hatching a plan. A plan that would, if all went well, (All is always well) etch lines of immense promise onto mother India's palm. Lines it did etch, but with a mind of their own, and with a little help from the economic revolution around the world, they scripted a story of their own. And what a story it was! Starting with a pioneering trend in the semiconductor industry (and kicking up some pretty serious dirt in the bay area), the technical intelligentsia of our nation have moved from one pinnacle to another, leaving everyone in their turbulentwake.

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So far spread out is IIT alumnus' umbrella, that almost every stone today has already been turned over by IITians in the last few decades. Politics, social entrepreneurship, authoring, editing, journalism, entertainment media and consulting, IITians are every where. It’s the dream... Well, from all that has been said and talked about around the globe, it appears the dream has been fulfilled. Looking back at the Sarkar Committee Report and the address by the first Prime Minister of India, Pandit Jawaharlal Nehru, during the first convocation address of IIT KGP in 1956, the dreams of the nation representing India’s urges, a question arises have we really met them? Are we really able to select the real best students from all over India, rural and urban, without a booster dose of coaching classes!! What have these students been doing after being fully drained out starting from class VIII to XII and going through parallel economy of coaching classes!! Do we see the spark and challenge in the eyes of all the kids who are joining IITs today!! I am afraid, the answer would be negative. The issue of brain drain has been discussed at length over several years, oscillating between the philosophy of brain drain, economic gain and now brain gain!! The simple essence in starting these set of new IITs just after independence, was to create institutes of excellence and make a dent in the development of technologies so that nation prospers all encompassing. IITs do not figure in the top 100 institutes of the

world. We have not produced a single Nobel Laureate. We have not produced a technology which has created a flutter in the developed nation. Then don’t we have the ware withal. Yes we do have!! We have the best mathematical bent of mind, power of imagination, but this is curtailed somewhere down the line. Innovation is not valued with a few exceptions. Our teaching learning methodology, assignments, group tasks, question papers, evaluation methods, need radical change. This is certainly a responsibility of faculty and IIT administration. There are a few expectations from the students too. It pains to see students of IITs copying in examination, trying to steal a question paper from Professor’s PC (5point someone .. no exaggeration, there are factual incidents!!). Qualities of honesty, integrity, professionalism, innovation, have to be embedded in every student. The grades are not as important as to understanding the fundamentals and concepts. The co-curricular activities, getting along well with peers, team work, co-ordination and co-operation rather than mere competition are some other aspects which students need to inculcate. Students have everything that is necessary in their armory; only thing that is required is deep sense of commitment and action. I am confident, the students of IITs will bring in a true revolution and make India a destination for excellence.

F * ? 3 ? 2

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MESA

45

n m u l o C s Achiever D. Arumuga Perumal (PhD Student) # „ $%| `  \ $% | @  @ › ÂŁ ž$ =ŠŠž ¢` | | @ $_ ÂŒ $_ # | € #  ÂŒ `¢ ~ [ \ € {ÂŁ =ŠŠž> Siddharth Mehta (Final year) *|%›™Â? @™+ \ ƒŒ ÂƒÂƒ¤ Šž [ ƒ_ \ ›Â? @ Šž Satya Kalyan (Final Year) € # ˜ # @ [ | # @ ˜ \ # [

\ › @ =Š @ ` | ^ ƒ _ | @ ÂĽ $ @[ =ŠŠž$=Š Š

Anshul Garg (Second Year) @

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2006

yearbook2010

ABHISHEK KUMAR

Ghacchh, Bihari

Calculation of Radiative Heat Flux in Indian PHWRs Leibnitz Institute of Agrartechnik, Potsdam, Germany jam ke masti maaro, Khelo koodo, sab kuch karo, bas FROM Dhanbad midsem/endsem ke 2 din pehle se padhai shuru kar do 14th May NEXT Civil Services me hua to theek hai else will carry on PH 0326-2295173 with my Job EM taker2010@gmail.com BTP

INTERN

ADARSH BIKASH BTP Mechanical & Metallurgical characterization of EM Welds INTERN Indian Oil SAIKIA No dream comes true until you wake up and go to Guwahati work 27th March NEXT Tata Motors (Ahmedabad) / MBA (iff IIM A/B/C) 0374-2228053 niceboyadi@gmail.com

FROM

Adi, Saikia, Sax, Dabba, Chintu

PH EM

AJAY MALIK

MESA

PH EM

RIL, Jamnagar

Rohtak Enjoy the B.Tech life to the fullest 17th Jan NEXT Job for now 01262-295781 ajay007yaja@gmail.com

FROM

Chacha

BTP Analysis of non-Fourier heat conduction in a cylindrical geometry INTERN

47 AKASHDEEP VIRK

AKHILESH KUMAR

FROM Amritsar 10th May EM akashdeep.virk@gmail.com PH +91-9872122725

FROM Jhansi 21st Feb EM akhilesh305@gmail.com PH +91-9455163551

INTERN

University, Sydney

Akash,Virk

INTERN

BPCL, Mumbai

Akhi Design and development off slip sensor based on shear force decoupling technique Be who you are and say what you feel because those who mind don't matter and those who matter don't mind. NEXT Job at Coal India

BTP

CFD Computations of 1D and 2D Euler Equations in a shock tube Hard work never goes unrewarded, so please find your interests and work hard on them. Best Wishes. NEXT MS/PhD

BTP

AMIT K BALODA

ARUN K NIRALA

FROM Najafgarh 26th EM a.baloda@gmail.com PH +91-8010756214

FROM Jehanabad 30th Jan EM niralaiitg@gmail.com PH 9162387627

INTERN DRDO,

July

Bangalore

&

NTPC, Badarpur # $ + Studies on the effect of cerium oxide nano-particles as anti-wear lubricant additive

INTERN BTP

Study of Incompressible flow in Shock Tube

BTP

All the soaps on LAN are not good...but most of them are better than watching movies NEXT

Job. Where? That’s still undecided

Don't worry and be happy NEXT

Job at NTPC

CHAITANYA KAKI

BHANU P S RANA

FROM Nellore 6th May EM vishnu060589@gmail.com PH +91-9849506241

FROM Agra 15th July EM bps.iitg@gmail.com PH +91-9837709534

INTERN ONGC/Schlumberger

University of Luxem& '

bourg * & BTP When or when not to consider relaxation time in the radiative heat transfer within participating media

%

Design Improvisation of Cocoon Opening Machine

BTP

INTERN

Enjoy to the max NEXT

Job at Schlumberger

khao, piyo, mehnat karo NEXT

Job

48 BHUSHAN K SOREN

BIBEKANANDA M

FROM Deoghar 28th May EM bhushaniitg@gmail.com PH +91-9471327163

FROM Purulia 11th Jan EM madscientist007@gmail.com PH 9440533837

INTERN

IOCL Guwahati

Visakhapatnam Steel Murmu, Hixanyu Plant, Visakhapatnam BTP Design Improvisation of Cocoon Opening Machine INTERN

Sibbu Soren, Guruji

Analytical solution of geometrically nonlinear beam

BTP

dusron ke bakwas funde mat suno! NEXT

Job

NEXT

Learn to be happy in this wicked world; else it is self-destructible, being living here! Will take the life as it comes

CHANDRAKANT T

CHANDRA SEKHAR

FROM Lucknow 26th Aug EM no1rules@gmail.com PH +91 9415433153

FROM Guntur 19th June EM deva.chandraskr@gmail.com PH 0863-2252068

INTERN

IOCL, Guwahati

Leibnitz Institute of Agrartechnik, Potsdam, Ger BTP Drying of silicon beds INTERN

Chandu, Raveena

Position control of an active actuator during bending.

BTP

Always help your classmates and live in unity. NEXT

Job at GAIL

Be hopeful...:) NEXT

IAS / MBA

DEBENDRA DHARUA

DEEPAK SHILPI

FROM Bhaleswar 16th EM dharua@gmail.com PH 99937647667

FROM Bhopal 23rd Oct EM deepak.datamaster@gmail.com PH 0755-2625838

INTERN

July

IISc Bangalore

INTERN

NAL, Bangalore

Debu

Bakaru

Separation of Coal dust from Producer Gas

BTP

Separation of Coal dust from Producer Gas

BTP

With tick tick clock ticking, time is running out, try to enjoy every moment of the madness you will get here

Stay Focused !!! NEXT

MESA

Chandu

Job at NTPC

NEXT

Job at NTPC, prep for IES

49 GOVIND MOHAN

GRANDHI PRADEEP

FROM Bhagalpur 10th Aug EM govindmoh@gmail.com PH 9431057878

FROM Guntur 20th Dec EM grandhi.pradeep@gmail.com PH 9949912540

University of Nottingham, UK

INTERN GS

INTERN Granny, Goddy, CR

BTP Performance Enhancement of a drier in a

micro tea factory & increasing its fuel efficiency

NEXT

Do what you love and love whatever you do..In short, enjoy each moment of the four best years of your life... Job at NTPC for now and I will enjoy my future as it comes to me...

Products, Dehradun Grandhi,Grandy

Modeling and Analysis of Diesel Particulate Filters Do whatever that interests you and Follow your dreams and finally play DOTA :P

BTP

NEXT

Job at Reliance for 2-4 yrs and MBA from IIM.

SAIRAM GUTHANA

K PRASHANTH CHAUHAN

FROM Kothagudem 9th July EM sairam9920@gmail.com PH 9440870031

FROM Warangal 11th Nov EM chauhan.iitg@gmail.com PH 0870-2438538

INTERN

NFC, Hyderabad

INTERN

NAL-Bangalore

Ramboy

Modeling and analysis of Diesel Particulate Filters

BTP

gl & hf NEXT

Job at Tata Motors

BTP

& Rheological Properties of Hybrid Nanofluids

Make max utilizations of IIT’s facilities. Kuch bhi mat chhodna. (Gym, MCM, refunds :) NEXT Job at IOCL.

M USHA KIRAN

MAHAVEER PRASAD FROM SardarShahar 15 Aug EM mahaveer.agarwal@gmail.com PH 01564-221078

Oklahoma state University, USA

INTERN Teschnische Universitaat

Optimization of machine components Live the way u love. Enjoy!!

NEXT

BTP Modeling & Experimentation on Thermal

FROM Mahabubnagar 7th Sep EM cookiran2004m@gmail.com PH 0854-2250036 INTERN Kink

Job at Mahindra & Mahindra.

Racer, Chauhan, /

Bergakedmie Freiberg, Germany

Mahi, Chadda

Analysis of non-Fourier heat conduction in a cylindrical geometry Dreams are not what you see in sleep, Dreams are which do not let you sleep. NEXT JOB in core for 2-3 years then might go for MBA or start up.

BTP

50 ADITYA MUSHYAM

NAGAVENKAT ADURTHI

FROM Hyderabad 2nd Jun EM adityamushyam@gmail.com PH 040-24054692

FROM Hyderabad 27th May EM n.adurthi@gmail.com PH 040-24031106

CTTC-UPC, Barcelona, Spain BTP Two Dimensional simulations of wake and mixing layer interaction for a flow over a square cylinder INTERN

INTERN

Visaka Industries

Mushi

Chill n Rock when in IIT :) NEXT

PhD

Naga, Savuko BTP

Vibration control of a partially complaint 4 bar mechanism

Acads matter a lot....especially a very good CPI NEXT

MS

NARESH NALLAMALA

NAVEEN K BASWAL

FROM Khammam 27th Aug EM nareshnallamala1@gmail.com PH +91-9000909247

FROM Sawai M’pur 22ndNov EM nbaswal.iitg@gmail.com PH 07462-221106

INTERN SRAAC

INTERN

Ltd., Kurnool, AP Design and Fabrication of Educational Toys

NTPC, Anta

Nella

BTP

Popu, Basu

Position Control and Analysis of an Active Actuator during bending motion

BTP

Don't let emotions control us! We should control them!! NEXT

Job

Enjoy the IIT life NEXT

NAVNEET TYAGI

NISHED SINGHAL

FROM Ghaziabad 14th Sep EM navneet_1859@yahoo.co.in PH 0120-2781400

FROM Siliguri 1st Sep EM nished.singhal@gmail.com PH +91-9832088400

INTERN

IOCL Guwahati

INTERN

Langda Tyagi

Experimental and numerical feasibility of high speed projectile impact welding

BTP

Be passionate and honest about whatever you do.P.S: maintain a decent CPI. ;) Job at M&M will do an MBA after few years.

NEXT

MESA

Job at PSU or Civil services

RIL, Jamnagar Kats, Katya

Computational Study on Single Stage and Multi Stage Metal Hydride Based Hydrogen Compressor Do not lose your individuality in the crowd NEXT Job for few years; may go for an MBA later

BTP

51 BTP

NITIN KISHORE

PANKAJ SANGWAN

FROM Bareilly 2 Nov. EM nitinkishore.iitg@gmail.com PH 9412291866

FROM Bhiwani 11th Jul EM sangwan.pankaj@gmail.com PH 9812002025

INTERN NTPC Anta

INTERN CTTC,

(Raj.)

7

Barcelona

Study of nucleation study in water

BTP

UPC, Terrassa,

Design & development of slip sensor based on shear force decouplingtechnique

enjoy your 4 years and don’t waste the opportunities u get here NEXT

job for some time

khush raho NEXT

PIYUSH ANAND

FROM New Delhi 4th Oct EM dewan.peehoo@gmail.com PH 011-25116165

FROM Chandigarh 5th Nov EM piyushanand88@gmail.com PH 0172 - 2572326

INTERN INRIA,

INTERN University

Nancy France

Development of water rocket for rescue operation

BTP

of Sydney, Australia BTP Studies on Porous Medium Combustion

Probably MS or job at Qwest

NEXT

Job at L&T

PRABHA SHANKAR

PRADEEP SAGWAL

FROM Saharsa 12th Dec EM prabhashankar25@gmail.com PH +91-9472856780

FROM Kurukshetra 1st Aug EM pradeep.sagwal@gmail.com PH 01746-254754

INTERN REL

Nuberg Engineering Sagu limited, Noida BTP Study of mechanical and metallurgical property of Electromagnetic welding.

Mumbai

Bhaaya

Nucleation Conformation

INTERN

Must do preparation for CAT...it will help U in placement NEXT

Dude

Have a passion in life, and never loose enthu in anything you do!

Everything happens for a reason

BTP

Chain aur aaram ki zindagi

PEEHOO DEWAN

PU

NEXT

Sangwan

No plan.......

Enjoy every moment at IIT NEXT

Job at sterlite

52 PRARTHNA MAJUMDAR

PRATEEK SACHDEVA

FROM Guwahati 5th Sept EM prarthana.majumdar@gmail.com PH 0361-2523167

FROM Gurgaon 25th Dec EM prateeksachdeva88@gmail.co PH 0124-4035140

Freidrich Alexander Univ/ErlangenNurnberg(Ger)

Schlumberger Asia Services Limited, Mumbai Jack Study of Porous Medium Combustion BTP and its incorporation in an LPG stove.

INTERN Palkie, Palkie.com, Majedar BTP When and

when not to consider relaxation time in radiative heat transfer 4 wonder yrs at G flies, you say? I say they stay.. we go :) Cheers to four years of fun mistakes and silly friends we made!!! NEXT MSE in Aeronautics and Astronautics (Stanford University)

INTERN

Choose a job you like and you will never have to work a day of your life.. Currently job at NTPC and then MBA after a year or two

NEXT

PRATIK SACHAN

RAGHUVENDRA REDDY

25th Feb FROM Kanpur EM coolpratik25@gmail.com PH 0512-2614833

FROM Warangal 12th Jun EM raghu.r.l5@gmail.com PH +919948439880

INTERN University

INTERN

of South Australia, Adelaide, Australia BTP Computational Study on Metal Hydride Based Hydrogen Compressor

Visaka Industries

Prats, Big Daddy P

Keep smiling...coz smile is a curve that sets everything straight! Job for now, then MBA after 2 or 3 years

NEXT

RAKESH KUMAR

ROHIT KOOLWAL FROM Jaipur 22nd Feb EM rohitkoolwal@gmail.com PH 0141-2521490

INTERN

IOCL, GUWAHATI

analysis of diesel particulate

filter Focus on your job NEXT

MESA

Job

control of a four bar mechanism using IPMC as rotar When you live for a strong purpose, then hard work isn’t an option. It’s a necessity. NEXT Rightnow job(Dr.Reddys),maybe an MBA after 2 years.

FROM Jehanabad 15th Jul EM iitg.rakesh@gmail.com PH +91-9939972442 Rakesh Bhai BTP Thermal

Raghu BTP Vibration

INTERN FMP Technology

GmbH, Germany Kool BTPNumerical prediction of radiative heat transfer in fuel channels of PHWR's Time is like a river. You cannot touch the same water twice, so enjoy every moment of life... NEXT Job as for now and maybe MBA in coming years.

53 ROHIT SINGHAL

SANSIDDHA PANI

FROM Aligarh 2nd Sep EM rohit7033@gmail.com PH 0571-6450708

FROM Bhubaneswar 7th Jul EM julupani@yahoo.com PH 0674-2545522

University of Minho, Guimaraes, Portugal BTP Noise and Vibration Control of Machineries used for Silk Processes INTERN

Single

INTERN HAL,

Helicopter Division Pani BTP Modeling and Analysis of a Heat Recovery System

Work for a decent CPI. It really matters. NEXT

Job at JSPL (possibly)

Have Fun..... Job at Tata Motors....may be MBA and entrepreneurship a few years down the line.

NEXT

S SATYA KALYAN

SAURABH MUNDEJA

FROM Hyderabad 26th Jun EM killertrue@gmail.com PH 040-23732589

FROM Chandigarh 2nd Jul EM saurav.mundeja@gmail.com PH 172-2592769

INTERN

Dr.Reddys, Hyderabad

INTERN HONDA

Mama BTP

Power Plant Design

BTP

Reduction of dents in silk machineries

Love u all...

Think big, act big and live big NEXT

Larsen and Toubro

Shalabh

Job at Coal India and MBA from IIMA after 2 years :)

NEXT

SHALABH MALHOTRA

SHESHANK VERMA

FROM Kanpur 18th May EM whizkidshalabh@gmail.com PH +91-9416212266

FROM Gurgaon 19th Aug EM sheshank.verma@gmail.com PH 0124-4008502

c INTERN

HSU Hamburg, Germany Verma, Burman BTP Aerodynamic design of Front wing of F1 Car Get the priorities right. Academics and sports help much more than Techniche, Alcher, Alfaaz etc.

Michigan State University, USA

BTP Aerodynamic

Design of a Front Wing for a Formula One Car "If we all did the things we are capable of doing we would literally astound ourselves." - Thomas Alva Edison NEXT Job at NTPC

INTERN

NEXT Right after graduation, job as an analyst at

Infosys. MBA for sure 3-4 years down the line.

54 samal, smaal

SHIVAKUMAR S

SHYAM K SHARMA

FROM Hyderabad 25th Aug EM samalashiva@gmail.com PH +91-9701100070

FROM Chhapra 15th April EM shyamsharmarocks@gmail.com PH +91-9431408517

INTERN Nuclear

INTERN

Fuel Complex,

Structural Optimization of Machine Components

BTP

Shyam BTP

Study on anti wear lubricant additives.

Have fun & good luck NEXT

Tata steel, Jamshedpur

Hyderabad

Job at GAIL

Look for the rising sun. NEXT

Job at EIL.

SIDDHARTH B

SIDDHARTH MEHTA

FROM Raipur 14th Apr EM siddharth12sid@gmail.com PH 0771-4022392

FROM Jaipur 17th Dec EM siddharth171287@gmail.com PH 0141-2520225

INTERN

IOCL Guwahati

INTERN

RIL, Surat

Siddi, Jehaadi, Baba

Bakar

Experimental and Numerical Feasibility of High Velocity Projectile Impact Welding

BTP

BTP

Study of hybrid Nano fluids

Gaming is not good for health, ahemm mama NEXT

Job

NEXT

SIDDHARTH KAMBALA

YASHASWY SIRUGUDI

FROM Vizag 30th May EM siddu.kambala@gmail.com PH +91-9397099413

FROM Hyderabad 1st Feb EM yash.sirugudi@gmail.com PH 040-23801380

INTERN

DRDO, Hyderabad

INTERN

Neo BTP

BTP

Harmonic Drive: Design and analysis If passion drives you, let reason hold the reins.

Carpe Diem \m/ Job for now‌ will pursue MBA in an yer or two...

MESA

DRDO, Hyderabad yash, yasu, ssv

Harmonic Drive: Design and analysis

NEXT

Alcher, Techniche or Manthan, none will get u a job or MS, only two things are useful in IIT, CPI and Bakar! MBA

Right now job (RIL), maybe a MBA later on.

NEXT

55 SUMAN KUMAR

SURESH R

FROM Biharsharif 6th May EM k.suman019@gmail.com PH 9934214439

FROM Chennai 12th Feb EM nasrsuresh@yahoo.co.in PH 9840382044

INTERN IOCL

INTERN Q-Tech

(Guwahati)

Suman babu

Fabrication and Design of educational toys

BTP

Everything is possible if you are honest. NEXT To

become an IAS officer

NEXT

FROM Patna 14th Nov EM sushant4u.iitg@gmail.com PH 0612-2665312

15th Apr FROM Jodhpur EM tush.iitg@gmail.com PH +91-9829188741

Q-Tech tooling, Bangalore BTP Improvisation of lap-cutting machine for ERI silk processing Don’t suppress. do it..Whatever u ever wished.

INRIA-Nancy, France Development of water rockets for rescue operations

INTERN BTP

Lila, Tush

Enjoy your four years of stay here in whatever way you like because there’s always a happy ending and someday you will realize"HEAVEN WAS HERE...ONCE". NEXT Will

probably go for an MBA after a work experience of 2-3 years.

JSPL

UDIT VARSHNEY

YASH DALMIA

FROM Aligarh 29th Apr EM uditinheaven@gmail.com PH 9411041906

FROM Nagpur 28th Nov EM jigsaw.yash@gmail.com PH 0712-2541685

INTERN Narora

INTERN

atomic Power Station BTP Thermal analysis of diesel particulate filter Beware of people who say "padhne se kuch nahi hota” Job at SAIL

RIL, Jamnagar Dalu, Daldiya, Charlie

mut-man, chantu

NEXT

Settling in chennai

TUSHAR LILA

INTERN

Kaaliya

Get your future planned before it’s too late.

SUSHANT KUMAR

Babloo

NEXT

tooling, Bangalore BTP Self lubricated bearings

Development and Performance evaluation of self lubricating cutting tool.

BTP

Be a 'fighter' in whatever field you choose ahead in your life. Job at RIL…Planning for a startup in Centralized Air cooling.

NEXT

FOURTHIER’S DESK

56

MESA

A Maverick in all or

justa CPI 10? Adarsh Bikash Saikia UG IV

Every story runs on a particular plot. Happiness, sad, thriller, scandalous, greed or provocation, anything can make up a good plot. But some stories have them all; blended in uneven proportions to let the protagonist himself decide, which plot should come next. These are the stories that are never ending. They flex in whichever way you want them to. They may be very confusing; like this one! This is the story of a guy who loves mathematics, plays with physics and never lets the chemistry running inside his body, make him any less passionate for learning. He is treasured, cherished, esteemed by the people around him, intelligence that can only be matched by the 100th guy coming next. He walks into the gates of IIT Guwahati, a beautiful campus, picture perfect sceneries, an ambience that can give the best tourist resorts of our nation, a run for their money. Now initially, that is on the day of our orientation every one of us has a different dream. As the director welcomes us, we sit beside our parents; silent, sincere-look on our faces and trying very hard not to concentrate on the pretty sister of one of the freshers’ (Damn!! How you wish she was as intelligent as his geek brother). It seems as if the director will speak for like ever… “Be a good student, study well, you’ll have tough competition; enjoy your life at IITG and so on.” But somewhere inside our minds the “engineer” is getting inspired. The Biotech guy was thinking about the new gene he’d introduce after 2nd year, the CS guy was already busy hacking Google in his mind, the mechanical guy was calculating the efficiency of the flying machine he would start working on and the “designers” had no idea what is in store for them. So most of us have at least something planned for the next 4 years of our stay at their respective departments. We are in IIT! We feel our life is now set and we are going to be rich and prosperous. Then comes MA101. What diverges? What converges? What makes you say 2 comes after 1? Do you think you can fool the prof. by making him buy it, when you say that 1 is greater than 0? How stupid of you. Your best friend, who had been a 100% in every math exam, ever since he learnt the numbers 1,2,3…, got 0.5/10 in first quiz. You felt happy to have at least scored in the average region (that is 0). You hate real analysis, you hate mathematics on the whole, you hate going to classes and finally you start hating IIT. Just the other day the metric second division commerce guy of your school called you up and

57 told you about all the beautiful girls in his class and that he was going out with Nita, no wait, was it Gita, or was it theta? Or omega? Gosh!! All these formulae start driving you crazy. But still somehow your best-friend manages to ‘just pass’ all his courses. A 6 point something sounds okay to him ‘cuz the books are written only on the crazy five-pointers. Your friend is a ‘genius’. You are also doing good‌ just 2 backlogs- ED and maths (What are summers for?). The very ambitious minds who once thought of writing hacks for Google and facebook, are now attending counseling sessions specially organized by DOAA and Welfare Board for the underperformers. The mechanical guy’s flying machine crashes into bits even before sketching its design and he carries his ‘drafter’ for 3 consecutive odd semesters. The designers were happy this time; they were crowding the core-1 canteen. One of their professors just gave a treat to every student ‘cuz the whole class scored above 8 this semester. Your best friend is in the band. He’s become a rockstar, awesome singer, awesome guitarist. When you sloth he slogs- a cricketer too, going for inter-IIT too!! Isn’t their supposed to be some restriction at the number of talents a person can have!! But you are relaxed. How stupid your friend is. He thinks his guitar can mesmerize the Profs into grading him dassis, or he can turn his magic bat to get a job in the placements. He is also in the debating team! How nerdy does that sound? The people in the debate team only talk- just give them a topic and they’ll TALK for hours together. They have an auto-START button for Talk and a defective STOP one. Don’t you

think your friend is having a boring time at such places? You play your counter strike, dude! Kill that terrorist ‌ common ‘’Fire in the hole’’. You just spent your 3rd year summer at IITG. You are all clear now. No backlogs, finally you can throw away your drafter (DD in ME-111). The placement season begins- you and your friend both apply for the last company of the semester. And you think you have an edge dude! You are 0.12 higher than him in CPI count. Some of the questions asked in that interview:-You sound like you are from Bihar, is it true? No sir, its Jharkhand. Okay, what are your hobbies? Counterstrike. I was the best terrorist of my clan. Do you know who the finance minister of our nation is? Umm.. Narendra Modi, sir, I guess. Where was your 3rd year internship? IITG ED ME111. Thank you! You may leave now. Wow awesome interview man. You nailed them all. It isn’t required to tell that with all your so called accomplishments you will finally get a job(if u do not go for Ms) in TCS. And the best part your friend over whom you had an edge of .12 or so CPI is going off for a job in one of the companies but with a better off package than yours. It’s just how he had managed to outsmart other IITians by making others think that his guitar or bat wouldn’t speak for him in the interview!! Being an IITian isn’t being a nerd or so, but creating an aura amongst everybody outside who is already in awe. What do you think, which plot of yours led to this story? Confusing? Let it be so, I am sure IITians are smart enough to finish the plot on a better and a positive note understanding the essence of other activities while maintaining a respectable CPI‌.

“

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Â… DOAA and W =

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FOURTHIER’S DESK

58

MESA

FOREIGN ya INDUSTRIAL?? the intern dilemma...

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59

INTERVIEW

Chandrakant Tandon, GAIL India interview

Have you seen the GAIL website?

Yes Sir

Tell me the URL of the website.

Sir, I typed GAIL on Google and then clicked on the topmost result; didn't see the URL.

(they were not convinced)

sir ek bachha bana hua tha website par!

(A smile appeared on everyone's face)

Nished Singhal, IIM Bangalore interview !3 %

How many coaches are there in Delhi metro train?

25

(puzzled) 25?

No sir, 25 is the number of gates, there are around 5 coaches.

(While coming back from the interview, I counted the coaches, there were 4!)

# % 9

Where are you from?

Bareilly

Who sang the song (singing) "Jhoomka Gira re bareilly k bazar mein!"

(confused) I don't know!

60 Siddharth Mehta, RIL Intern interview

Why do you want to join Reliance?

My father worked for Aditya Birla Group, 2nd biggest industrial group in India. I want to work in a company that is bigger than the company that my father worked for. So, I have no option other than Reliance!

Pankaj Sangwan, John Deere interview

Can you make some changes in condenser and pump of Rankine cycle so as to get a better efficiency?

Sir, industry has been using this cycle since years in the way it is and right now I'm not in a position to make such changes but may be after 5 or 10 years of research I might do something.

What do you know about power steering?

Whenever I go to my village during vacations I drive tractor in fields. I've seen something like "power steering" written over there. As per my knowledge, power steering mechanism reduces required force to turn the tractor.

Usha Kiran, M&M interview

Have you ever thought why people can’t get out of their cars when they are stuck in heavy rains (like almost drowned) (Interviewer laughed and said OK, nice try!)

MESA

May be because the electrical equipment of the car gets crashed and they cannot open the doors!

61

tHINK

tHE

E D I S t OU

BOX

3 3 =

1 ^ 1 ?

` Â… ) ;

) q@ ˆ x … W

)††

Q: What will you do if I run away with your sister?" “I will not get a better match for my sister than you, sir."

Q: Interviewer (to a student girl candidate) - What if one morning you woke up & found that you were pregnant..?? Girl - I will be very excited and take a day off, to celebrate with my husband. *Normally an unmarried girl will be shocked to hear this, but she managed it well. “Why should I think it in the wrong way...?� she later added when asked.

Q: (He had ordered a cup of coffee for the candidate. Coffee arrived and was kept before the candidate) and then he asked, “What is before you? “ Candidate: (Instantly replied) “Tea" C He got selected. You know why did he say "TEA" when he knows very well that coffee was kept before him. (Answer: The question was "What is before you (U - alphabet) Reply was "TEA" (T - alphabet) Alphabet "T" was before Alphabet "U�)

62 source: internet and e-mails

Q: The interviewer asked the candidate "This is your last question of the interview. Please tell me the exact position of the center of this table on which you have kept your files." *Candidate confidently put one of his fingers at some random point on the table and told that it was the central point of the table. Interviewer asked, “How did u get to know that this is the central point of this table..?”, to which candidate replies quickly , “Sir, you are not likely to ask any more question, as it was the last question that u promised to ask.....” And hence, he was selected for his quick-wittedness....

II

T

‘G

’f ac to r

This is what Interviewer expects from the Interviewee…. "THINK OUTSIDE THE BOX"…

Gaurav Kapoor UG II MESA

63

M.Tech Batch ‘10, ME IITG 3

3 Â…

F `

! H € H %

1.

Prince R.

Machine Design

A comprehensive three dimensional fracture mechanics study of functionally graded material structures using finite element analysis.

2.

Yogesh Kumar Rathore

Fluid & Thermal Engg

Ignition delay time measurement of biofuel using shock tube.

3.

Nagarjuna Reddy.Y

Fluid & Thermal Engg

Performance analysis of transpiration cooling technique in hypersonic applications.

4.

Khilawan Singh

Machine Design

Virtualization Of Mechanical Vibration Experiments For Internet Based Remote Laboratory

5.

H.Lalhmingsanga

Fluid & Thermal Engg

Experimental Investigation of Free Surface Elevation of Liquid In an Excited Rectangular Container.

6.

A.V. Dhanunjaya Reddy

Machine Design

Optimum Design and Analysis of Tapered Roller Bearings

7.

Dinkar Brajeshkumar K

Fluid and Thermal

Combustion study of producer gas run dual fuel diesel engine.

8.

Dinesh Kumar Yadav

Machine Design

Detemination of T-stress by interior collocation method by using finite lement method.

64 9.

Machine Design

Geometrically nonlinear analysis of the functionally grad panels

10. Mahesh Kumar Yadav

Fluid and Thermal

Modeling and Simulation of a Co-generation power plant.

11. Sudarshan Kumar

Machine Design

Stability Analysis Of Pressure Dam Bearing

12. Bhogilla Satya Sekhar

Fluid & Thermal

13. Amol S. Chaudhari

Fluid & Thermal

Performance studies on metal hydride based thermal energy storage system. Modeling of a Gas-turbine cycle Cogeneration plant with biomass as fuel

14. Viraj Vilas Shete

Fluid & Thermal

15. Maqsood Alam

Fluid & Thermal

16. Nilesh Murlidhar Bondre

CAM

Friction stir welding forming behavior

17. Garlapati Nagababu

Machine design

Finite element determination of Shape of the Three Parameter Zone at the Crack-Tip.

18. Devendra Kumar Sahu

Machine design

A study on the performance of interior collocation method for determination of stress intensity factors

19. Pawan Kumar Rathore

Machine Design

Optimal Sensors-actuators placement in smart frp structure using genetic algorithm.

20. Satya Pramod Jammy

Fluid & Thermal

Characterization of scramjet engines

21. Girish Oppattaiyamath

Fluid & Thermal

Conjugate Heat Transfer Analysis in Hypersonic Flows

22. Nirmal Halder

Fluid & Thermal

Design & development of multi-feed biogas digester

23. Praveen agrawal

Fluid & Thermal

Multi-time scale analysis of a bio-heat transfer problem using the lattice boltzmann method and finite volume method.

24. Shashi Mohan

CAM

Recrystallization Phenomenon in Cold Worked Steels

25. Amit Kumar Haldar

Machine Design

Unaxial and multiaxial performance of thermoplastic composite material

26. Gundavarapu V S Kumar

Fluids And Thermal

Computation Of Various Incompressible And Micro Flows Using Lattice Boltzmann Method

27. N.Vikram Manoj Kumar

Machine Design

Design and Devlopment of Self-Lubricating cutting Tool For High speed Machining

28. Saptarshi Mandal

Fluids and thermal

Preperation and characterization of nanofuel to reduce the emission level of a diesel engine with Cfd analysis and experimental verification

29. M. Bhargava

CAM

Deformation Mechanism Maps For Cast Zirconium Alloys

30. Anand Mohan Fapal

Modelling And Stability

Analysis Of Rotors Supported On Gas Foil Bearings

31. Ajay Sharma

CAM

Tribological Characterisation Of Nanocomposite

32. Vijay More

Machine Design

Nonlinear analysis of annular circular paltes

MESA

Abhay Bodake

Application of Immersed Boundary Method to Incompressible Viscous Flow Development and analysis of Reduced Order Models for unsteady aerodynamics loads

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Nostalgia Treading around the alien place With apprehension, hopes and fears Getting used to the hectic pace Yes I miss those four great years Acting like the boss around With the uncanny support of peers Enjoying the courses newly found Yes I miss those four great years So looking forward to fly away Inspired from the seniors’ cheers The resolute patient self at display Yes I miss those four great years Carving a future in a distant dream Remembering the joys and tears All emotions to the very extreme Yes I miss those four great years Trapped now in a distant land Great from afar though it appears Looking back I now understand How much I miss those four great years Siddharth Kalla, Batch of 2009, = > @@7 Q

mechanika > Z

Z

‘

1 / 3 ; * !1/3*% Department of Mechanical Engineering Email: mesa@iitg.ernet.in W 4 € 4    4°'[H$Š[H"”_"™## E ˆ4°'[H$Š[H"Š'#™Š"

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