Research On Sled Test Technique Of Occupant Restraint System In Multiple Types Of Frontal Crash

With the development of technology and economy, automobiles has entered manyfamilies as a convenient means of transport. But the number of casualties caused by trafficaccidents also increased rapidly. How to ensure the safety of occupants has become a hotissue in today’s society. Humanity has to realize that a good passive safety has become anexcellent quality automotive products essential. The automobile has improved people’squality of life, meanwhile traffic accidents have become a hazard to human life and propertyas a major social problem. So with the changes in consumer attitudes, the major automobilemanufacturers increasing emphasis on vehicle safety.As the best means of reproduction accidents, the full scale crash has been widelyrecognized by the major manufacturers. But its high costs and long trial test period alsobrought many problems. As the sled test method can only achieve a single degree of freedomof movement, the movement of the dummy posture cannot be simulated by the existing sledtest method. Using the driver’s sided B-pillar lower acceleration as the input waveform aretoo harsh for the passenger. So the restraint system parameters cannot be optimized by theexisting sled test method.Based on a sedan as the research object, this article describes the Circle of ConstantAcceleration. The relation of vectors of acceleration can be derived. According to this theory,the improved test methods trolley are proposed. And the new method has been verified bythe simulation software. The occupant restraint system is optimized by using the Taguchidesign method in the simulation of the frontal offset impact and the frontal degree impact.The results show that the improved method can simulate the dummy’s head and chestacceleration components in each direction in the course of a frontal collision simulation. Thissled test method greatly improves the simulation accuracy and reduces the cost of the test.