Abstract: Aiming at the problem that traditional airbag is prone to puncture by the impact of occupants large in stature, a novel tandem airbag with double chambers is designed to enhance its protection effects for passengers large in stature. Firstly a model for the occupant restraint system of an A-class car is built based on MADYMO and its effectiveness is verified by simulation and test. Then on the basis of the model for vehicle frontal crash verified, a frontal crash model with tandem airbag is established, on which a frontal crash simulation is conducted. Finally the parameters of tandem airbag are optimized by orthogonal test. The results show that the tandem airbag optimized makes the WIC for the occupant large in stature reduce by 30.7% compared with traditional airbag, significantly enhancing the safety performance of occupant restraint system.

Key words: frontal crash;tandem airbag with double chambers, orthogonal test, optimization