Research On Optimization Of Vehicle Structural Crashworthiness Based On Improved Whale Optimization Algorithm

Facing the increasingly serious traffic accident problem,how to improve the safety performance of the car when the collision accident happens has become the focus problem to be solved urgently.As a key element of vehicle passive safety performance,the crashworthiness of vehicle body structure has a direct impact on the damage to occupants caused by impact load.Therefore,the optimization of vehicle body structure is of great significance to reduce the damage to occupants.In this paper,considering the complexity of the structural optimization problem,the optimization model was established by using swarm intelligence algorithm and approximate model technology to study the optimization of the crashworthiness of the body structureWhale Optimization Algorithm(WOA)is a global optimization algorithm based on group cooperation,which has good performance but some limitations.Therefore,an improved multi-objective whale optimization algorithm(IMOWOA)is proposed.The algorithm uses chaotic search strategy and global extremum optimization strategy to enhance the group search ability,reduce the blind spots,enrich the diversity of the population,and avoid the precocious convergence.In addition,the external repository strategy is used to maintain the diversity of the population,and the method called superiority of the feasible solution is adopted to amend the infeasible solutions that violate the constraints.The feasibility and effectiveness of the proposed algorithm are proved by function optimization problems.For the crashworthiness optimization problem,firstly,the finite element model for40% offset-frontal crash was established and the simulation results are verified with the real vehicle test.Secondly,a high-precision least squares support vector regression(LSSVR)model was constructed to replace the finite element model for response prediction,and WOA was used to optimize the parameters of the LSSVR model to improve the accuracy.Finally,based on the deterministic optimization scheme and reliability optimization scheme,IMOWOA algorithm and WOA-LSSVR model technology were applied to optimize the crashworthiness of the front-end structure,and the optimization results were verified by simulation.The results show that the crashworthiness of the front-end structure is significantly improved compared with the initial design.Compared with the deterministic optimization design,the objective performance for reliability optimization design is slightly decreased,but the reliability is effectively improved.