A reversible bumper system for protecting pedestrian lower limbs from car collisions

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A reversible bumper system for protecting pedestrian lower limbs from car collisions

Huang, Sunan / Yang, Jikuang

This study investigated the performance of a Reversible Bumper System (RBS) for protecting pedestrian lower limbs from car collisions. The Finite Element (FE) model of the RBS was developed based on a validated car front FE model. The FE models of a lower legform impactor and a pedestrian lower limb were used to investigate the performance of the RBS model at different impact conditions. The bio-fidelity of the EEVC WG17 lower legform impactor is poor for the knee kinematics. It is doubtable to use the legform impactor to predict the pedestrian knee injuries. The performance of the RBS for protecting pedestrian lower limbs can be obviously improved by reducing the bumper stiffness. The protective performance of the RBS is impaired during the deploying process by the speed of 2.5 m/s or greater.If less than 150 mm, the maximum deployment distance of the specific RBS has no influence on the bumper protective performance. The calculated injury parameters from the human lower limb FE model can be used for the evaluation of protective performance for a newly designed bumper system.