Customer Magazine
Fraunhofer Institute for Structural Durability and System Reliability LBF
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ResearchDevelopment
Adaptive Helmholtz resonators PAGE 12
EditorialLBF
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Dear friends of Fraunhofer LBF, in close partnership with its customers, Fraunhofer LBF handles R&D projects in the areas of polymer technology, light-weight structures, vibration technology and reliability. In this issue of our customer magazine, we present some of the challenges our research scientists are overcoming on a day-to-day basis – from the development of technologies for plastic processing up to the implementation of light-weight structures in the automotive sector, the development of adaptive Helmholtz resonators for noise control, and the assessment of the reliability of electrical vehicles. A further highlight over the last few months has been the successful evaluation of the AdRIA project. We will continue to push ahead intensive cooperation with our strategic partners, Technische Universität Darmstadt and Darmstadt University of Applied Sciences. Our work currently focusses on technological consultation and the transfer of technology into commercial applications. In line with the Fraunhofer motto „We invent the future“, we will continue to develop solutions ranging from individual components through products right up to complete systems, and provide consultation in all areas of reliable, light-weight structures. We are looking forward to facing the challenges you may present to us in close partnership with you!
Prof. Dr.-Ing. Tobias Melz Director (acting)
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Content PAGE HighLight LOEWE Center AdRIA – top-notch research into smart structures
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ResearchDevelopment Design of interfaces: Development of tailor-made adhesion promoters and compatibilizers
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Pushing the limits – Injection-molding of compounds with functional additives and high filler content
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Durable and functionally integrated light-weight design of chassis components in automotive engineering
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Allowing for strain-hardening in fatigue assessment
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Adaptive Helmholtz resonators
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High-frequency test facility for NVH investigations in the automotive sector
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Fatigue analysis of structural adhesive bonds in vehicle body construction
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Center for System Reliability / Electromobility ZSZ-e
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UpDates Upcoming events
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EDITORIAL INFORMATION: Published by: Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF, Bartningstraße 47, 64289 Darmstadt, Phone +49 6151 705-0, Fax +49 6151 705-214, info@lbf.fraunhofer.de, www.lbf.fraunhofer.de Director (acting): Prof. Dr.-Ing. Tobias Melz · Strategic Management: Dr. Ursula Eul, Katja Schroll © Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF, Darmstadt, November 2014 Overall production: G+R Agentur für Kommunikation GmbH, 64319 Pfungstadt, www.gr-kommunikation.com Pictures: LBF-Archiv, Katrin Binner, Claus Borgenheimer, Ursula Raapke, Hessen-schafft-Wissen All rights reserved, including, but not limited to the right of reproduction, circulation and translation.
HighLight
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LOEWE Center AdRIA – top-notch research into smart structures The LOEWE Center Adaptronics – Research, Innovation, Application (AdRIA) is one of ten LOEWE Centers funded within the framework of the Hessen State Government Program for the Promotion of Scientific and Economic Excellence „LOEWE“. The Center was supported with funds in the middle double-digit million Euro range over a period of six years, extending to mid2014. The LOEWE Center AdRIA started out in mid2008 with the explicit objective of creating an internationally leading research center for smart structures in Darm stadt, an established location for scientific facilities. Over the last few years, Darmstadt has become one of the top addresses for research on smart structures in Germany and throughout Europe, and has established itself as an international leader. As part of the program, a research center for smart structures was established at Technische Universität Darmstadt, along with a Chair for Structural Health Monitoring. At the same time, a complementary
research and training center for „Functionally Integrated Light-Weight Design“ was established at the Darmstadt University of Applied Sciences. Beyond the expiry of the Hessen State funding program, the three partners will continue their cooperation under the roof of the LOEWE Center AdRIA, in order to promote research in the area of smart structures. In March 2014 the LOEWE Center AdRIA was successfully evaluated by a committee of high-ranking experts. The experts were impressed with the results achieved as well as with the demonstration systems that had been implemented and specifically praised the efficient cooperation of the partners. Based on the recommendations of the committee of experts, the Hessen State Government has granted an extension of funding until mid-2016 in the amount of a further € 2.6 million. The purpose of this funding extension is the transfer of the Fraunhofer side of the center into a division for smart structures at the Fraunhofer LBF.
The AdRIA team following the interim review in 2011
Development and adaptation of new functional materials Research activities in the area of material development currently revolves around the development of elastomer actuators and sensors, materials for the design of transparent sensors, high-temperature piezo ceramics, functional thinfilms and lead-free piezo ceramics. Specifically in the area of lead-free piezo ceramics, significant progress was achieved within the framework of the research work conducted at the AdRIA center, which focused on the temperature-related proper-
ties of barium titanate based lead-free systems. Temperature stability up to 60°C was demonstrated for both small and large signals. Likewise, significant progress was achieved in the area of dielectric elastomers for use in dynamic applications. A unique electrode design enables the performance of such stacked actuators to be systematically adjusted. These actuators feature through excellent force coupling with the surrounding structures. Apart from investigations relating to the use of these actuators as adaptive absorbers for vibration control, the
HighLight
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EAP stacked actuators for dynamic applications
long-term stability of dielectric elastomer stacked actuators was demonstrated in durability tests. Fraunhofer LBF has a clean-room workplace for the production of stacked actuators from thin elastomer films. Development of manufacturing technologies for the production of functionally integrated structures and components Designated target of these manufacturing processes are enhancing economic efficiency in the production of active structures, enabling these structures to be offered in the market for a lower price. An innovative process was developed at the LOEWE Center AdRIA, in which piezo electric actuators are monolithically integrated into structural components by means of
selective laser melting. Apart from effectively protecting the actuator from harsh environments, the method developed also enables application tailored adaption of stiffness, actuator pre-loading and coupling to the adjacent passive structure. Research work further concentrated on the development of printed resistive strain gauges. Manufacturing processes were developed using the flexographic and the screen printing methods, which enabled strain gauges
and thermal sensors to be printed successfully. A further sensor production method was determined by combining the foil stamping printing process with laser technology. By this even finer sensor, structures with higher quality and stability over time can be produced. In addition, deep-drawing processes were developed, which enable functionally printed metal sheets or sheets pro vided with metal conductor traces to be formed with de formations up to 20 percent.
sents a particular research focus. Over the last few years, prototypes of sensors, actuators as well as adaptive and active absorbers of various shapes and sizes have been built for a variety of applications in vibration control: For
Adaptive vibration and noise control Vibration technology is a key element of the research activities, whereby the development of networked systems and components for adaptive or active vibration control repre-
Active engine mount in a test vehicle
Piezo actuator models produced in an additive production process
example in automobiles (e.g. convertibles), mechanical engineering, wind turbines, aircrafts, rail vehicles or medical devices. In addition, dedicated methods and simulation toolboxes were set up for the design, development and evaluation of components, enabling the modelling and simulation of such active systems. In addition to a number of other practical test facilities, two test vehicles were constructed within the framework
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of the lead project „Adaptive Car“, in which the individual solutions for vibration and noise control were tested under in-vehicle conditions and refined for use in volume production. A milestone in the development process was the design of an active engine mount. Its design, comprising a piezo actuator, silicone springs, control system and power electronics, isolates the engine from the body causing fewer vibrations to be transmitted and thus significantly reducing the noise level in the vehicle. Furthermore, scientists at the LOEWE Center AdRIA were engaged in the development of solutions for reducing
HaLOEWEN energy efficient sensor node (current prototype shown in the foreground)
LOEWE-Center AdRIA celebrates its 6th anniversary.
Follow the link to view the video. http://bit.ly/1pR1x88
sound transmission through double-glazed windows, based, e.g. on elastomer actuators (see above), and the design of methods for sound masking. Structural and condition monitoring Research in this sector revolves around the development and combination of various methods and systems for monitoring of damage attributes on structures, e.g. by load measurement and analysis vibration analysis, or ultrasound investigations. Scientists are concentrating on smart sensor networks for monitoring, for example the condition of bridges, wind generators, rotating systems or critical vehicle components. For the latter application, a system was developed
within the framework of the EU Maintenance on Demand (MoDe) project, which received the renowned DHL Innovation Award 2013. Beyond the development of appropriate sensors, along with simulation, modelling and control technology for global and local structure monitoring, the Darmstadt scientists also created a unique sensor node, characterized by highly efficient operation and hence ultra low energy consumption. Another objective is development of energy autonomous sensor systems. A prototype of such a system has already been built and is currently further improved within the framework of the project „Energy Autonomous Mobility – Reliable, Energy Autonomous Systems for Mobile People“ (ESZüG) of the German Federal Minstry of Education and Research (BMBF). Adaptronics Center in Darmstadt with impact on the whole of Europe On 7 May 2014, within the framework of the annual Europe Week, the Hessen State
From the left: Acting Institute Director Prof. Tobias Melz, Prof. Thilo Bein, Head of LOEWE Center AdRIA, and Boris Rhein, Hessen State Minister of Higher Education, Research and the Arts together at Fraunhofer LBF
Minister of Higher Education, Research and the Arts, Mr. Boris Rhein, was able to obtain a first-hand impression of the innovative capacity and relevance of the Darmstadt adaptronics research facility and its importance for Europe.
Contact Prof. Dr.-Ing. Thilo Bein +49 6151 705-463 thilo.bein@lbf.fraunhofer.de www.loewe-adria.de
ResearchDevelopment
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Design of interfaces: Development of tailor-made adhesion promoters and compatibilizers To accurately tailor the properties of plastic materials to the requirements of a specific application, polymers are frequently combined with each other or with other substances into new materials. However, most plastic materials are insufficiently compatible with one another and with other materials. Hence, the nature of the interface between the components has a significant influence on the property profile of the resulting multi-Â phase polymer systems. For this reason, polymer-based adhesion promoters and compatibilizers are developed in
the Division Plastics to optimize proven or create new materials. Unlike currently available systems, these offer the capability of being tailored specifically to the combination of materials being used. Adhesion promoters and compatibilizers are typically functionalized polymers, which can be produced with specific polymerization methods, which is what the group for the design of interfaces specializes in. The substances can be added to a plastic material as an additive or applied to the surface as a primer. For initial testing, the products are syn-
Synthesis of adhesion promoters and compatibilizers on a laboratory scale
Upscaling of synthesis in the kilogram laboratory
thesized on a laboratory scale. To be able to assess their effectiveness under close-to-real conditions, LBF’s kilogram laboratory provides the capability of upscaling the synthesis procedure. In this way, adhesion promoters and compatibilizers can be produced on a kilogram scale and made available to the customer, for example for conducting their own tests. Various projects have demonstrated that the adhesion promoters and compatibilizers developed were able, for example, to improve the mechanical properties of polymer blends, improve the fiber/ matrix bond in fiber-reinforced
plastics, or increase the adhesion between incompatible substances in hybrid materials.
Schematic presentation of the improvement of adhesion between incompatible materials
Contact Dr. Roland Klein +49 6151 705-8611 roland.klein@lbf.fraunhofer.de
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Pushing the limits – Injection-molding of compounds with functional additives and high filler content Beyond standard applications, additives and fillers for plastic compounds enable property profiles to be achieved, which go far beyond the properties typically expected from plastics. The systematic development of highly filled plastic compounds allows e.g. the functional properties of powder solids, such as carbon in the form of soot (carbon black) or graphite, metal powders or ceramics, to be combined with the outstanding processing properties of plastic materials. A key challenge for this class of materials lies in ensuring the processibility of the
materials for the concerned specific component. With this in mind, the Division Plastics at Fraunhofer LBF, along with the development of the material, also creates the essential models for simulating processing properties of a material before the material is actually processed. Injection molding simulation is a widely established method for investigating processing properties. The reliability of such a simulation is essentially dependent on the quality of the respective material models. Ultra high-filled plastic compounds require appropriate measuring and eval-
Fig. 1: Validation of a material model for ultra high-filled graphite compound, shown here for a bipolar plate for fuel cell applications. The simulation of the weld front can be seen on the right, the experimental result on the left
Fig. 2: Design of an injection molded USB contact made of a conductive plastic compound developed at Fraunhofer LBF
uation methods for determining the essential material property models used in the simulation. Fraunhofer LBF has the expertise to determine all necessary material data and material models for molding simulation for such rheologically complicated materials, prepare this information for use in the simulation, and conduct an experimental validation, if desired. Deliberately avoiding reverse engineering, we use only directly measured material data. By way of example, Figure 1 shows premature freezing of the melt front of an ultra high-filled molding compound during filling of a geometrically complex cavity in the simulation. The photo-
graph on the left shows the actual molded part manufactured under identical injection molding conditions. Figure 2 shows injectionmolded USB connectors. Again, the filling of the mol ded part with cross sections below 1 mm² can be simula ted with high prediction accuracy, even for an ultra high-filled material.
Contact Dr. Christian Beinert +49 6151 705-8735 Christian.Beinert@lbf.fraunhofer.de
ResearchDevelopment
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Durable and functionally integrated light-weight design of chassis components in automotive engineering Durable and functionally integrated light-weight design is a key technology when it comes to reducing the energy consumption of vehicles without limiting the increasing mobility in the population. There is a significant weight reduction potential, not only relating to the vehicle interior and exterior, but also in the area of structural engine and chassis components. Specifically where the chassis is concerned, lightweight materials such as carbon or glass fiber reinforced plastics may substantially reduce the overall weight of the system. In addition, optimizing the choice of material and stiffness will also contribute towards a noticeable improvement in ride comfort. The potential for durable, functionally integrated lightweight design is particularly high in the area of chassis components, where numerous individual components provide a variety of options for combining multiple individual components into a single, multi-functional component. Further potential for light-weight design can be derived from the
material used – conventional steel or aluminum parts can be replaced with parts made from carbon or glass fiber reinforced plastic. Functional integration in this context is to be understood not only as the integration of several components or functional elements into a single component, but also includes the integration of sensors into a structure, enabling the structure to be monitored in service. This can be achieved through so-called structural health monitoring
systems (SHM systems). The Lightweight Structures department at Fraunhofer LBF has recently developed a suspension control arm made from carbon fiber for a middleclass car, to replace a conventional steel control arm. The main focus of attention was the fiber-compatible design, in particular with a view to suitability for a high-volume production process. The use of carbon fibers and a fibercompatible design enabled a total weight reduction of
35 percent to be achieved. The next step in the design of the light-weight suspension arm will be the integration of a structural health monitoring system, enabling monitoring of areas of the control arm exposed to particularly high loads. This will permit the detection and display, e.g., of damage caused by abuse (such as an accident) or material fatigue – with a view to improving the safety of the components and, above all, enhancing traffic safety.
Control arm made from carbon fiber
Contact Dominik Spancken Paul Töws +49 6151 705-412 dominik.spancken@lbf.fraunhofer.de paul.toews@lbf.fraunhofer.de
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Allowing for strain-hardening in fatigue assessment Cold-forming processes are highly cost efficient, and coldformed components are therefore widely used in the mechanical engineering and automotive sectors. This process causes the material strength to increase locally as a result of strain-hardening. Taking this effect into account in the durability assessment of coldformed components allows additional weight and cost savings. On behalf of Schaeffler Technologies GmbH & Co. KG, Fraunhofer LBF has investigated the effect of cold-forming, using as example the housing of a spur-wheel differential. To this end, samples of two initial materials were analyzed at different stages of the forming process. The tests showed that strain-hardening results in a doubling of the yield strength and an increase in ultimate tensile strength of more than 50 percent. So as not to have to depend on an experimental analysis of samples in different forming states throughout the assessment process for each individual material,
Fraunhofer LBF has developed the ANSLC program, enabling cyclic material parameters of materials in various cold-forming states to be estimated cost-efficiently on the basis of a tensile test conducÂted on the initial material state and the total equivalent plastic strain. Based on the parameters determined experimentally and with the help of the ANSLC-program, a numerical service life assessment of the gearbox housing sample component was conducted, whereby the inhomogeneous distribution of cyclic material properties in the component resulting from the cold-forming process was taken into account in the FE model. The numerical fatigue assessment conducted on the housing suggests an increase in the admissible component loading of up to 50 percent. This would allow a reduction of the component weight or the use of a less costly material.
FE model of the cold-formed housing
Contact Dr. Volker Landersheim Alessio Tomasella +49 6151 705-475 volker.landersheim@lbf.fraunhofer.de
ResearchDevelopment
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Adaptive Helmholtz resonators
The increasing traffic volume both on the road and in the air has brought about the need to reduce noise exposure in residential and commercial buildings. Adaptronics provides a variety of measures by which this can be achieved. The LOEWE Center AdRIA investigates the use of Helmholtz resonators to reduce indoor sound fields and mitigate sound transmission through double-glazed windows. Helmholtz resonators are devices for passive reduction of sound fields in rooms and sound transmission through double-walled structures such as double-glazed windows. In the past, Helmholtz resonators have been used to reduce narrow-band noise sources. Being passive systems, they benefit from lower energy consumption compared to active measures. Given that the majority of noise sources have a time-variable frequency characteristic, a novel concept was developed, which enables resonators to be controlled adaptively in line with the prevailing signal. Energy is
needed only to adapt the semi-passive system to the signal present. Helmholtz resonators are basically similar to mechanical mass-damper. Their tuning frequency is modified by varying the geometrical properties. Helmholtz resonators are a bottle-like structure comprising a neck and a round base, acting as mass, stiffness and damper of a mechanical system. Based on this knowledge, the resonator can be tuned to the desired absorption frequency by varying the geometry of the neck and the base. To investigate the noise reduction effect for indoor sound fields, an acoustic demonstrator and an office container were used. The acoustic demonstrator took the form of a hollow rectangular cuboid block, having inside dimensions of 870x620x750 mm³, with a non-absorbent wall structure. With this setup, a reduction of cavity resonance up to 19 dB was achieved. The inside volume of the office container was around 15 m³. Here, a reduction up to 21 dB was achieved.
To analyze the effectiveness of the system with regard to the reduction of sound transmission across symmetri cal and non-symmetrical double glazed windows, test carriers having dimensions of 650x900x16 mm³ and 650x900x26 mm³ were fitted with Helmholtz resonators acting on the hollow space between the two panes.
For the symmetrical doubleglazing, tests with a Helmholtz resonator showed a reduction of vibrations by up to 5 dB. The asymmetrical structure was assessed by simulation, whereby a reduction of the vibrations up to 19 dB and a reduction of the emitted sound power was achieved with up to four resonators.
„Acoustic aquarium“ with two Helmholtz resonators reducing sound transmission from a loudspeaker through a doubleglazed window and the indoor sound field
Contact Tim Bastian Klaus +49 6151 705-8368 tim.bastian.klaus@lbf.fraunhofer.de
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High-frequency test facility for NVH investigations in the automotive sector The test and characterization of vibration isolation mounts with a view to minimize noise emission in the vehicle (both structure-borne and air-borne sound) constitute an essential element of the NVH (noise, vibration, harshness) development process. This aspect applies equally to conventional power trains with internal-combustion engine, electrical power trains and hybrid vehicles. Reducing noise emission presupposes the reliable, experimental determination of characteristic parameters, which will enable an evaluation of the vibration isolation mounts and ensure a design in relation to the desired NVH system characteristics. In this context, the dynamic transfer stiffness is one of the important parameters. The parameter characterizes the vibro-Â acoustic transfer behavior in complex quantities and defines the inertia, spring and damping characteristics at various frequencies. The new test facility to characterize passive and active isolation mounts will be taken
into service at Fraunhofer LBF during the first quarter of 2015. In terms of actuator technology, the new test fa cility comprises an electromechanical spindle drive and an electro-dynamic vibration exciter to realize a broadband frequency excitation. The maximum force amplitude of the vibration exciter, which is capable of providing arbitrary dynamic signals, amounts to 8 kN. The dynamic force amplitude can be combined with a static preload of max. 5 kN. Depending on the test specimen, the test facility is developed to investigate isolation mounts up to 2000 Hz and a dynamic vibration displacement of max. 50 mm. The test facility will provide new development possibilities with the aim to minimize structure-borne and air-borne noise emission in the automotive industry, machinery and plant engineering, energy and consumer goods. Fraunhofer LBF customers will benefit from the new test capabilities for passive and active isolation mounts within service and research intentions.
Fig. 1: Fraunhofer LBF research vehicle for NVH investigations
The following options will be available: - Investigation and development of new isolation components (passive and active engine mounts, materials, and variance of elastomers) - High-frequency characterization of plastic components as well as of passive and active mounts at frequencies up to 2 kHz - Parameter selection and validation of numerical simulation models (e.g. by means of the dynamic stiffness, cf. Fig. 2) - Transfer path analysis (on the basis of the stiffness method) within the framework of NVH tests
Fig. 2: Validation of FEM simulation models of elastomers by measurement data
- Time domain replication of field measurements in the test facility to develop control systems for active mounts (cf. Fig. 1)
Contact Matthias Schmidt +49 6151 705-452 matthias.schmidt@lbf.fraunhofer.de
ResearchDevelopment
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Fatigue analysis of structural adhesive bonds in vehicle body construction Requirements with regard to the reliable joining of lightweight structures have been becoming more and more demanding, not least due to the use of a variety of dissimilar materials. Adhesive bonding offers a number of benefits as a joining technology: On the one hand, this joining technology enables materials to be joined, which are either unsuitable for welding, or difficult to weld, such as fiberreinforced plastics. Secondly, enhancements in terms of crash behavior or NVH properties can be achieved. For newly developed products, calculation and simulation procedures have to carry out within the framework of the design of such structures. During this
process, potential for lightweight design is often neglected, which would result from fatigue design considering variable amplitude loading. To take into account the specific requirements for structural adhesive bonds within the framework of experimental fatigue analysis, a novel, component-like specimen was developed at Fraunhofer LBF. Results of investigations carried out under various cyclic loading show that the allowable load amplitude is approximately 75 percent higher in the case of fatigue assessment considering variable-amplitude loading, compared to a conservative assessment for constantamplitude loading with the
Component-like specimen (specimen shown on the left, CAD model with clamping adaptor on the right)
Comparison of the fatigue strength of the bonded, componentlike specimen under constant and variable amplitude loading
maximum occurring load range. This means that there is a weight-reduction potential. Numerical fatigue life assessments can be performed on the basis of the stress averaging and the critical distance approach. With regard to linear damage accumulation, it must be noted that the damage sums observed are dependent on stress distribution, failure criterion and load spectrum. Over many years of research Fraunhofer LBF has been able to develop significant expertise in the area of fatigue assessment of struc-
tural adhesive bonds, and will gladly support you in the assessment of your bonded joints.
Contact Dr. Jens Eufinger +49 6151 705-276 jens.eufinger@lbf.fraunhofer.de
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Center for System Reliability/ Electromobility ZSZ-e The new Fraunhofer LBF Center for System Reliability / Electromobility ZSZ-e will be opened in March 2015 at our Kranichstein campus, comprising new offices, various seminar and meeting rooms, as well as dedicated project rooms designed for close cooperation between LBF research scientists and customers. In addition, the center is equipped with leadingedge test facilities, accommodated in a fully equipped test building, as well as a highperformance test facility for battery systems, housed in a separate building. In total, the ZSZ-e provides 4,000 m² of floor area, which includes 650 m² laboratory surface. Technical focus of the ZSZ-e research work: • Development and implementation of suitable test procedures for battery systems • Definition of simplified testing procedures and testing guidelines • System analysis and assessment (module, complete battery, cooling system, BMS) • Analysis and assessment of load data
• Research fleet (EMOBILBF) for recording load data under actual driving conditions High-performance test facility: • Battery tester with 250 kW electrical power • Environmental chamber with 16 m² surface area, 3,5 m high, providing a temperature range from -40 to 80°C • Multi-axial simulation table (MAST) for introducing mechanical loads (vibration, shaking) into specimens with a mass of up to 1,000 kg, at frequencies up to 200 Hz, up to 13 g The test facility offers the unique opportunity of simultaneously introducing mecha nical, thermal and electrical loads into traction battery systems, including a full set of sensors for detailed monitoring and evaluation of the test procedure, providing a high-value offering for suppliers, developers and manufacturers of traction battery systems in the area of cars, vans and commercial vehicles.
LBF research fleet The LBF research fleet comprises: • Tesla Model S • Smart Electric Drive • Smart Micro Hybrid Drive • Nissan Leaf • BMW i3 Range Extender • BMW i3 • Artega GT • GEV | one Objectives of research work conducted with the fleet: • Recording of load data under real-life driving conditions • Analysis of user behavior • Assessment of influences on traction battery and driving behavior resulting from the time of day/season, traffic volume and road condition • Identification of weak points and definition of optimization potential for electric vehicles
Events March 26, 2015 Opening of the «Center for System Reliability/ Electromobility ZSZ-e» Office building, laboratory and battery testing center Including greeting, keynote address, presentation of test facility for battery systems and Fraunhofer LBF concept vehicle «GEV | one» March 27, 2015 «Traction-E» Technical Conference With contributions by experts from industry and research regarding battery and driveline traction systems. Presentation of new developments, electro mobility driving experience.
Contact Dr. Chalid el Dsoki +49 6151 705-8490 chalid.el.dsoki@lbf.fraunhofer.de
UpDates
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Upcoming events We would be pleased to welcome you at one of the following events: Testing methods for durability testing in vehicle construction, German Association for Materials Research and Testing DVM
January 28 – 29, 2015
Zwickau, Germany
4th Conference on Light-Weight Design 2015 of the Fraunhofer Lightweight Design Alliance
February 11 – 12, 2015
Oberhausen, Germany
International Polyolefins Conference
February 22 – 25, 2015
Houston, USA
Reliability of mechatronic and adaptronic systems, German Association for Materials Research and Testing DVM
February 25 – 26, 2015
Dresden, Germany
Practical applications of polymer analysis
March 20, 2015
Darmstadt, Germany Fraunhofer LBF
Elastomer components, German Association for Materials Research and Testing DVM
March 24 – 25, 2015
Hannover, Germany
Opening of the „Center for System Reliability / Electromobility ZSZ-e“
March 26, 2015
Darmstadt, Germany Fraunhofer LBF
„Traction-E“ Technical conference
March 27, 2015
Darmstadt, Germany Fraunhofer LBF
Hannover Fair
April 13 – 17, 2015
Hannover, Germany, Adaptronics joint booth
Conference on Technical Reliability of the Association of German Engineers VDI
May 20 – 21, 2015
Leonberg, Germany
For further information, please visit: www.lbf.fraunhofer.de/veranstaltungen