Abstract: Based on GB 20072—2006 and rear-end collision in real life,finite element model of a passenger car with a dummy in rear-end collision is established,which correspond to car-sled model and car-car model respectively.Each model contains two types:original model and model without rear bumper.The simulation shows that deformation of structures of rear vehicle and injury of passenger increase heavily in model without rear bumper.The situation also happens to car-car model.In general,structural deformation and human injury in car-car model are higher than that in car-sled model.Thickness of rear bumper is optimized via moving least square response surface method and Adaptive Response Surface Method(ARSM).It is expected that to light weighting of rear bumper and improve injury of passenger.

Key words: rear-end collision, rear bumper, moving least square response surface method, adaptive response surface method