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Performance Analysis of a Bumper-Pedestrian Contact Sensor System by Using FE Models

Sunan Huang (Institutionen för tillämpad mekanik, Fordonssäkerhet) ; Jikuang Yang (Institutionen för tillämpad mekanik, Fordonssäkerhet) ; Rikard Fredriksson
International Journal of Crashworthiness (1358-8265). Vol. 13 (2008), 2, p. 149-157.
[Artikel, refereegranskad vetenskaplig]

A pedestrian contact sensor in the car bumper is a potential solution to trigger an active hood system. Because of the high level of temperature dependency for the bumper foam stiffness, the sensor output can be unstable at varying temperatures. A new contact sensor was therefore developed to provide a temperature-independent measurement for pedestrian impacts. This study analyzed the performance of the bumper-pedestrian contact sensor system. First, a baseline Finite Element (FE) bumper model of a production car was developed and validated. Based on the baseline model, an improved bumper model was subsequently developed to meet the requirements of the lower legform impact tests proposed by Working Group 17 of the European Enhanced Vehicle-safety Committee (EEVC WG17). Second, a FE human lower extremity model was developed. Using this model, the baseline and improved bumper models were further evaluated in terms of the predicted knee ligament raptures and long bone fractures. Finally, the new contact sensor was built into the improved bumper model. A performance study was then conducted to evaluate the sensor effectiveness. Consequently, a better diameter for the sensor tube was identified in terms of the temperature stability and mass sensitivity of the sensor output.

Nyckelord: pedestrian safety; contact sensor; finite element simulation; bumper safety performance

Denna post skapades 2008-01-14. Senast ändrad 2016-10-18.
CPL Pubid: 66006


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