Injury effects of knee airbags on Chinese human dummy

Abstract

Two kinds of knee airbags and dummy crash simulation models are established, and the accuracy of the models is verified by comparing the knee module impact test data and CAE simulation data. A knee airbag and dummy crash simulation system is established, and the frontal collision finite element simulation of the Chinese 50th percentile dummy is carried out under the three conditions of no knee airbag, bottom-mounted knee airbag, and rear-mounted knee airbag. According to the regulations of China-New Car Assessment Program (CNCAP), the injury data of major body parts such as the head, chest, femur, and legs are compared and analyzed, and the differences in damage to the dummy caused by the bottom-mounted knee airbag, the non-knee airbag and the rear-mounted knee airbag are focused on. Conclusion: Compared with the HIII dummy with knee airbag, the chest compression and tibia compression force of the Chinese dummy with knee airbag are larger, and the compression force of femur is smaller; compared with the condition without knee airbag, the value of head acceleration, tibial index, chest deformation, etc of Chinese dummy can be reduced with knee airbag, but the tibial axial force and knee side displacement have increased; compared with the condition of the rear-mounted knee airbag, the bottom-mounted knee airbag has better protection performance for the dummy’s head, chest, upper leg, and lower leg, but the knee side displacement of bottom-mounted knee airbag is greater, and the axial compression of the tibia is greater. This paper can provide a theoretical basis for the design of knee airbag in the Chinese market and the development of Chinese human dummy.