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Design of Light-Weight Vehicle Front End Structure for Pedestrian Protection
Technical Paper
2012-01-1176
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
With a significant increase in awareness of sustainability and increased interest towards low-cost solutions, every automobile manufacturer is looking for light-weight, safer and modularized solutions for many systems involved in the vehicle. Weightage for these three factors can vary depending on the location and functionality of the system. Front end system of a vehicle is a typical example, where all the three factors assume equal importance. The system consists of a front end module (FEM) mounted with an energy-absorbing system designed to meet pedestrian safety requirements. The focus of this paper is to develop a methodology for the design of thermoplastic light-weight pedestrian-safe front end structure.
The proposed front end structure consists of an injection-molded long glass fiber polypropylene (LGF-PP) FEM and an energy-absorbing system, which consists of an energy absorber (EA), mounted on the bumper beam, and a lower-leg protector (also referred to as an undertray) mounted on the bottom portion of the FEM. The full plastic FEM is observed to offer substantial reduction in both the weight and the cost in addition to the other benefits such as integrated functionality and modular assembly. The EA and undertray are designed to give desired stiffness distribution along the vehicle width to meet pedestrian impact requirement. A concurrent design approach is used to optimize both these systems to achieve the desired weight and cost targets and the required performance. Finally, case studies are presented to understand the structural performance of the LGF-PP FEM and pedestrian impact performance of the complete front end system.
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Citation
Kulkarni, S. and Mana, D., "Design of Light-Weight Vehicle Front End Structure for Pedestrian Protection," SAE Technical Paper 2012-01-1176, 2012, https://doi.org/10.4271/2012-01-1176.Also In
Rollover, and Side Impact, Safety Test Methodology, and Structural Crashworthiness 2012
Number: SP-2336; Published: 2012-04-13
Number: SP-2336; Published: 2012-04-13
References
- Cheah, L. Evans, C. Bandivadekar, A. Heywood, J. “Factor of Two: Halving the Fuel Consumption of New U.S. Automobiles by 2035” October 2007
- European Federation for Transport and Environment “Background Briefing: Weight vs. Footprint, Weight-based standards make CO2 targets harder to reach,” April 2008
- Koch, B. Knözinger, G. Pleschke, T. Wolf, H.J. “Hybrid-Frontend als Strukturbauteil” Kunststoffe 89 1999 3
- Schijve, W. “100% composite front-end system for next generation cars” AV-TV Conference Baden-Baden 2001
- Kulkarni, S. Schijve, W. “Glass-Reinforced Thermoplastic Composites for Front End Module Applications” SAE 2010
- EuroNCAP 2004 “European New Car Assessment Programme (EuroNCAP) Assessment Protocol and Biomechanical Limits.” www.euroncap.com January 2005
- Sofi, F. Kulkarni, S. Haarda, M. Takaaki, N. “A Novel Energy Absorber Design Technique for an Idealized Force- Deformation performance,” SAE Technical Paper 2008-01-0184 2008 10.4271/2008-01-0184
- Schijve, W. “Long glass fibre PP, High performance at medium fibre length” 3rd AVK-TV Conference Baden-Baden September 2000
- Schijve, W. “Long glass fibre PP composite quality in actual parts” Vortrag 6. Internationale AVK-TV Tagung Baden-Baden October 2003
- Kulkarni, S. Nagwanshi, D. Bobba, S. “Efficient and Cost Effective Energy Absorbers for Automotive Bumper: A Novel Energy Absorber,” SAE Technical Paper 2009-26-0009 2009 10.4271/2009-26-0009
- Nagwanshi, D. Mana, D. Allen, K. Bobba, S. “Diagnosing Vehicle Aggressiveness for Pedestrian Leg Impact and Development of Efficient Front End Energy Management Systems,” SAE Technical Paper 2010-01-1168 2010 10.4271/2010-01-1168