Simulation Research On Driver's Side Restraint System Of A Passenger Car Frontal Impact

With the development of science and technology,automobiles have entered the homes as the most commonly used means of transportation.China's car sales have remained the number one in the world for many years,so with the increase of cars,car safety issues have become the primary problem at present.The number of frontal collisions is the most extensive and the damage is the most serious.In order to reduce the damage on the driver's side of the car after a frontal collision,it is necessary to match and further optimize the restraint system on the driver's side of the frontal collision of the car.The main research contents of the thesis are as follows:(1)Comparison of frontal collision standards at home and abroadThis paper first introduces the calculation method and main content of the injury index in the standard C-NCAP on the front side of the domestic frontal collision driver,and sets the relevant national standards for the subsequent test and simulation.The C-NCAP is then compared to the Euro-NCAP to arrive at a different focus between the two standards.In the comparison,the different standards of different countries have been detrimental to the development of automobile safety and the unified real vehicle crash test standard is two development trends.(2)Test and simulation of the front side of the car on the driver's sideOn the basis of understanding the national standard of the frontal collision restraint system of the automobile,according to the relevant requirements,the driver's side collision test of the frontal collision of the vehicle is established,and then the acceleration of the head,the acceleration of the chest and the force of the seat belt are obtained.The experimental data related to the system model is used as a verification verification standard against the subsequent simulation model.After this,MADYMO software and Hyperworks software are used to establish a simulation model of the driver's side frontal collision restraint system of the passenger car.The test data of the test and simulation and the corresponding part of the test image are benchmarked to verify the test data and simulation model.Reliability,combining theory with practice,in order to achieve the next optimization design.(3)Optimization of driver's side restraint system for frontal collision of vehiclesAccording to the problems existing in the restraint system equipped with the driver airbag,it is determined that the optimization purpose of the constraint system in this paper is to reduce the damage index values of the dummy in the simulation and obtain a better constraint system by optimizing the constraint system.Therefore,sensitivity analysis is first performed to determine the parameters and scaling ratios that need to be optimized,and the corresponding optimization index parameters are obtained.After that,the four-factor four-level orthogonal test is performed on the basis of three factors and three levels in other papers,one more factor level.The parameters considered are more extensive,and the optimization effect obtained is more accurate.Then,according to the test method variance analysis in operational research,the innovative orthogonal test is validated to verify the reliability of the data obtained by the orthogonal test.Based on the determination that the orthogonal test data is completely reliable,the polar test is based on the results of the orthogonal test.The difference analysis is further verified and optimized,and the optimization of the frontal collision constraint system of the passenger car is realized.(4)Results and conclusionsIn this paper,after the sensitivity analysis,the main parameters affecting the frontal collision driver side restraint system are the diameter of the airbag,the diameter of the airbag vent hole,the airflow rate of the generator,and the seat belt limit force value.After orthogonal test and range analysis,the order of influence of the above four parameters on head injury index HIC,chest acceleration and chest compression was obtained.Finally,based on the reduction of all damage indicators,the final optimization results of the driver's side restraint system for the frontal collision of the car are obtained.The research methods in this paper can provide some references for performance optimization of constrained systems under other speed or other forms of collision conditions.