Virtual Optimization And Test Validation For Frontal Occupant Restraint System In Frontal Collision Base On C-NCAP Of Automobile

With the popularity and development of cars,traffic accidents are more and more.Every year,tens of thousands of people die in traffic accidents,and the number of injured is even more numerous.Automobile collision safety has been paid more and more attention by all walks of life.Frontal collision is one of the most common forms of vehicle collision in automobile traffic accidents.During the collision process,the restraint system in the vehicle including seat belts,seats,airbags,steering system and other safety components will provide protection to the occupants,which can effectively reduce the injury degree of the occupants.The occupant constraint system is composed of several subsystems,each subsystem needs to match each other to achieve the optimal protection effect.At present,collision test and computer simulation analysis are mainly used to match the constraint system.The collision test method is the closest to the actual vehicle collision,and the results are more reliable,but only through the test.The method needs long development period,high cost for vehicle and high cost for test.Computer simulation technology can be involved in the early stage of product development,through the simulation analysis and calculation of the data model and optimization improvement,so as to reduce the cost of automobile test and development and shorten the development cycle.However,the computer simulation analysis method can not completely simulate the actual vehicle collision conditions.With the development of computer simulation and analysis technology,more and more engineers apply computer simulation technology and collision test method to the development of constraint system.Based on the fact that an autonomous compact car meets the five-star requirement of 2018 version of C-NCAP,this paper optimizes and improves the front row restraint system of 100% overlap rigid wall barrier collision test and tests.To achieve its performance decomposition target in 100% frontal impact.This paper first introduces the present situation of passive safety of automobile,and expounds the influence of C-NCAP on road safety in China.Secondly,the damage mechanism of occupants in frontal impact and the test method and evaluation method of 2018 C-NCAP 100% overlapping rigid wall barrier are introduced in detail.And then through L.S-DYNA software is used to simulate and calculate the constraint system of front row passenger base configuration under 100% overlapping rigid barrier impact test condition.Then the performance of the front row constraint system is optimized and improved by the method of experimental design.Finally,the performance of the optimized constraint system is verified by the frontal impact simulation test,and finally the 100% overlapping rigid wall barrier impact test is carried out through the actual vehicle.Verify that the front-row constraint system meets the performance decomposition goal in the frontal 100% overlapping rigid barrier collision test of version 2018 C-NCAP.From the point of view of engineering design,based on the 2018 version of CNCAP evaluation rules,the method of combining simulation analysis technology with test means is used to complete the development of frontal occupant restraint system under 100% overlapping rigid wall barrier collision.The forward development process of a complete front row constraint system is introduced,which provides an important reference for the subsequent development of vehicle constraint system.