International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 08 Issue: 07 | July 2021
p-ISSN: 2395-0072
www.irjet.net
DESIGN, OPTIMIZATION AND STRUCTURAL ANALYSIS OF BICYCLE CHASSIS Adarsh Unnikrishnan1, Abuthahir M2, Albert Jose3, Muhammed Mohazin KS4, Sadanandan R5 1-4UG
student, Department of Mechanical Engineering Professor, Dept. of Mechanical Engineering, Rajadhani Institute of Science and Technology, Kerala, India ---------------------------------------------------------------------***---------------------------------------------------------------------design an optimized bicycle chassis using topological Abstract - The bicycle frame has been undergoing optimization and analysis using different materials. many changes and advancements these days. The chassis frame has to be able to cope with different 2. METHODOLOGY criterias including the strength, weight, cost and apt shape. The best chassis is the one that could have an 1. Study of Triangularisation of Chassis 2. Dimensional Analysis overall performance in the above mentioned criterias. 3. Initial Geometry Formation So our project takes into account the above mentioned 4. Load Calculation factors. This project aims to design an optimised 5. Static analysis { Deformation and stress ) bicycle chassis using topological optimization and 6. Topological Optimization analysis using different materials. 7. Final Geometry Formation. 5Assistant
8. 9.
Keywords: Topological optimization, creo, finite element analysis.
Static Structural analysis. Material Analysis.
2.1 Initial geometry
1.INTRODUCTION Bicycles are a popular and clean mode of personal transportation for short distances in cities due to many social and environmental changes in recent years. Frame is the main structure of a bicycle on which various accessories are mounted. The bicycle chassis has been undergoing many changes and advancements these days. The chassis has to be able to cope with different criteria including the strength, weight, cost and apt shape. The best chassis is the one that could have an overall performance in the above mentioned criteria. So our project takes into account the above mentioned factors. First step is shape analysis which is done through Ansys tool Topological Optimization and FEA. Topology optimization (TO) is a mathematical method that optimizes material layout within a given design space, for a given set of loads, boundary conditions and constraints the goal of maximizing the performance of the system. That means volume removal in the area where very less materials are concentrated, thereby reducing the cost and weight. After that optimized shape is drawn in CREO software considering the standard codes. The design was made to undergo the structural analysis after the load calculation. The material optimization is the final step, the conventional material is aluminum alloy or steel alloy but our studies have proved the best material in terms of strength and stiffness is CFRP (Carbon Fibre Reinforced Plastic ). So the FEA results also proves that our study is same i.e. CFRP is better material. This project aims to
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Fig 1- Initial geometry of a bicycle chassis
2.2 Load calculation Forces are calculated at the different points and fixed supports are provided at the respective locations. Force are calculated considering the load of the passenger to be 75 kg. F = 75*9.81= 716 N Load at the handle bar = 506 N At the Pedal section ( falling from the top). V²= u²+2as , u=0 we get , V²= 2*9.81*3.1 = 60.822 m2/s2 V=7.92 m/s Acceleration at the ground, v = u+at, sub u=0, v=7.92 m/s, t=.1sec a=(v-u)/t = ( 7.92-0)/.1 = 79.2 m/s² Force = ma = 75 * 79.2 = 5946 N At the Bottom portion the Cylindrical Support is provided.
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