A simplified model of pedestrian upper legform impact for estimate of energy-absorption space underneath bonnet lead

Nie, Bingbing; Xia, Yong; Huang, Jun; Zhou, Qing

Affiliations

¹State Key Laboratory of Automotive Safety and Energy, Tsinghua University, China

Abstract

Pedestrian upper leg impact protection is a challenging requirement in the Euro NCAP assessment. This study is aimed to develop a simplified model to provide a more reasonable estimate of the minimum energy absorption (EA) space underneath bonnet lead for upper leg impact protection. Typical shapes of upper legform impact response (the impact force vs. legform intrusion) are summarized. Then a simplified finite element model is built to represent the stiffness characteristics of vehicle front-end, especially for the local area around the bonnet leading area. Energy flow under different initial energy levels is analyzed using the simplified model. A feasible estimation on the EA space requirement for achieving specified Euro NCAP rating is established for upper legform tests.

Links

URL: http://www-nrd.nhtsa.dot.gov/pdf/esv/esv22/22ESV-000014.pdf

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