Simulation Analysis And Optimization Of Automotive Seat Frontal Crash

The research on the car seat safety has always been an essential subject of research in various countries.With the continuous growth of car ownership,the incidence of traffic accidents is also increasing,the safety performance of the vehicle in the event of a collision is also being paid more and more attention to,the collision is a process of generating energy and absorbing energy,in this process,the car seat is always in contact with the human body and plays a very important role in protecting the human body from injury.Research on the safety and reliability of the seat is conducive to improving the safety performance of the car.In addition,the human body suffers from chest injury in a collision,the risk factor is large,and the optimization analysis of the human chest injury can better protect the safety of the occupants in the event of an accident.In this paper,safety and reliability research is carried out for the above situation.Firstly,the finite element model of the car seat was established based on the geometric model,and the finite element model of the seat was used to build the simulation model of the seat belt fixing point and carry out the calculation,and the simulation results were compared and analyzed with the test results,and the results showed that the simulation stress value of each key part of the seat had a small error with the test stress value,which verified the validity of the seat model,but the deformation of the seat anti-submarine tube and the slide rail was more obvious,and it was easy for the occupant to be damaged by excessive submergence,which provided ideas for the subsequent analysis and improvement of the seat structure.Furthermore,based on the requirements of C-NCAP version 2021,the finite element model of the frontal crash of the seat was built and calculated and analyzed,and physical tests were conducted for this condition,and the components with large deformation of the seat were analyzed and improved according to the mandatory requirements of the test,which initially improved the safety performance of the seat and made it meet the reliability requirements.In order to better protect passengers in the event of accidents,further optimal design of the restraint system is carried out on the basis of meeting the reliability requirements of the seat structure,through the analysis of the seat frontal collision working conditions of the dummy chest injury,the restraint system parameters that affect the degree of chest injury as the design variables,the chest 3ms synthetic acceleration,chest compression,viscous index of the three performance indicators to minimize the optimizing target The optimal Latin hypercube method is used to select the sample points and establish the response surface model.In the final analysis,based on the response surface model,the adaptive simulated annealing algorithm(ASA)was selected to optimal design of the restraint system parameters to reduce the thorax damage value under frontal impact conditions,the3 ms synthetic acceleration of the thorax of the dummy is reduced by 8.6g,the compression of the thorax is reduced by 11.19 mm,and the viscosity index is reduced by 0.21m/s.The optimization effect is obvious and meets the regulatory requirements.