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Design of “Lower Stiffener” for Controlling Pedestrian Lower Leg Injuries
Technical Paper
2011-26-0100
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SIAT 2011
Language:
English
Abstract
Pedestrian protection is becoming an increasingly important aspect in vehicle safety development across the globe. The two primary focus areas are protection to the head and the lower leg of the pedestrian in impacts with motor vehicles. This paper discusses the protection aspects for lower leg in pedestrian impacts.
The pedestrian lower leg injuries are measured in the form of deceleration; bend angle and knee shear as stated in regulations. Careful study indicates that a minimum of two load paths namely the upper load path (to support the femur) and the lower load path (to support tibia) are required to control the above stated injuries. Careful optimization is required to balance the stiffness on both the load paths. This paper further focuses on the component optimization to achieve necessary stiffness along the lower load path for injury control. One of the lower load path usually consists of the bumper, “lower stiffener” and its fixing system. Several iteration were carried out using CAE followed by physical tests with due considerations for design, performance, packaging and manufacturing constraints. The load path was optimized using correlated model and design was signed off successfully through full scale pedestrian lower legform tests
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Authors
Citation
Karimullah, S., Gokhale, A., Joshi, S., and Chalipat, S., "Design of “Lower Stiffener” for Controlling Pedestrian Lower Leg Injuries," SAE Technical Paper 2011-26-0100, 2011, https://doi.org/10.4271/2011-26-0100.Also In
References
- European Regulation (EC) No 78/2009 “The Type-Approval of Motor Vehicles with Regard to the Protection of Pedestrians and other Vulnerable Road Users” amending Directive 2007/46/EC and repealing Directives 2003/102/EC and repealing Directives 2003/102/EC and 2005/66/EC” January 2009
- EuroNCAP “Pedestrian Testing Protocol”, Version 5.1 February 2010
- http://www.ancap.com.au/
- http://www.nasva.go.jp/mamoru/en/assessment_car/head_protection_test.html
- http://www.euroncap.com
- Jin, Svoboda Martin, Kuklik “Influence of Bumper Design to Lower Leg Impact Response” Fisita Paper F2006SC05 2006
- ECE/TRANS/WP.29/GRSP/2009/17 “Draft Regulation on Pedestrian Safety” September 2009
- AIS 100 “Requirements for the Protection of Pedestrian & other Vulnerable Road Users in the Event of a Collision with a Motor Vehicle” July 2010
- EuroNCAP “Assessment Protocol and Biomechanical Limits”, Version 5.0 May 2009
- Schuster, Peter J “Current Trends in Bumper Design for Pedestrian Impact” SAE Paper No. 2006-01-0464 2006
- LS DYNA “LS DYNA Keyword user's Manual” Livermore software Technology Corporation 2007