Research On Restraint System Matching Under Multiple Frontal Crash Situations

In the process of designing and developing the vehicle occupant restraint system,there are still a lot of manual processes,which are time-consuming and laborious.To this end,this paper conducts a study on the matching of restraint systems under various frontal impacts,and explores a method that can quickly realize the parameters of the driver side restraint system for a variety of frontal collisions.The specific work of this article is as follows:First,by summarizing and comparing the domestic and foreign frontal collision regulations,four research situations were determined,and the “Weighted Injury Criteria(WIC)” was introduced according to the occupant damage evaluation standard in the regulations as the overall evaluation indicators in the optimization process of constrained system.Next,this paper studies the energy planning theory,and compiles the corresponding automatic solution program based on it,and explains the program’s running process,input data type and operation method.Moreover,using the acceleration waveform output by the finite element simulation and preset parameters,the restrained system is matched overall,and the guidance values or range of the values and the acceleration of driver’s chest are solved.After verification and analysis,it is found that although the driver acceleration curves obtained by this program are slightly higher in the amplitudes or slightly different in the displacement domain,however,it is consistent with the trend of the curves obtained by simulation,and the acceleration curves of the same working condition are basically the same as the area enclosed by the X axis.Therefore,the matching of this program is ideal.Finally,by using Orthogonal Arrays and Range Analysis Method for sensitivity analysis,eight main influence parameters of four collisions were selected.With the help of modeFRONTIER software,the Uniform Latin Hypercube Design was applied to obtain matching combinations between different parameters,a total of 40 sets of sample simulation results.By running the edited MATLAB script file,automatically reading the simulation results of the sample points,the quadratic polynomial response surface proxy models for each working situations were constructed,and the matching optimization of the restraint system parameters was completed by using NSGA-Ⅱ algorithm.Moreover,the entire process of establishing the proxy models,performing matching optimization and outputting optimization results can be completed automatically in a few minutes.Comparing the simulation results before optimization,it is found that the maximum value of the WIC values for the four working situations has not increased,and the WIC value in three of the working situations has been reduced.Moreover,the WIC value of the worst condition in the original model has decreased by 10.7%,and the WIC values of the other two working situations also decrease by 10.9% and 2.6 % respectively.Therefore,the optimization method adopted in this paper is fast and effective,and the optimized restraint system has a more balanced protection effect for the drivers in four working situations,which has a certain reference to the realization of automatic matching optimization of the occupant restraint system.