100% Front Crash And Its Crashworthiness Optimization Analysis

With the improvement of people’s living standard,the number of automobiles is also increasing,and people’s safety requirements for automobiles are getting higher and higher.Crashworthiness,as one of the important indexes of automobile safety,has always been a hot research topic.In this paper,100%frontal crash of automobile is studied,and its crashworthiness is optimized.Finally,its crashworthiness is improved.The details are as follows:(1)By consulting the literature,on the basis of in-depth understanding of the collision theory,grasp the content and methods of the research on the crashworthiness of automobiles,and finally determine the idea of replacing the complex finite element model with the approximate model to optimize the analysis.(2)Finite element model of the whole vehicle is built in ANSA,which mainly includes white body,four doors and two covers,power assembly,front and rear protection,seat interior and so on.Based on the boundary conditions set by laws and regulations,a 100%front impact finite element model of the whole vehicle is established,and the explicit dynamic analysis software LS-DYNA is used.The simulation results are obtained.(3)Through the analysis of the results,the credibility of the model is verified firstly,including the energy change of the whole vehicle,the mass change and the deformation comparison between the simulation and the real vehicle collision.Secondly,the deformation of key components of the vehicle,the speed and acceleration of column B,the energy absorption distribution of the front components,the cross-section force and the invasion of the passenger compartment are analyzed and compared with the regulations and standards.(4)According to the principle of maximum energy absorption,the thickness of 11 parts including anti-collision beam,energy absorption box,front longitudinal beam and upper longitudinal beam of sub-frame are selected as design variables.The radial basis function approximation with the peak acceleration of column B and the maximum intrusion of front panel as the optimization objective is constructed through the optimal Latin Hypercube test design sampling.Model.NSGA-II genetic algorithm is used to solve the multi-objective optimization problem,and a set of non-inferior solutions is obtained.Finally,the peak acceleration of column B and the maximum intrusion of front panel are reduced,and the crashworthiness of the vehicle is improved.(5)In this paper,the material and structure size of the front bumper are simulated.Aluminum alloy 6101 was used to replace the low carbon steel material in the original model,and the thickness matching of the anti-collision beam and energy absorbing box under the aluminum alloy material was carried out.Finally,the replacement vehicle model is simulated and verified,and the results show that the crashworthiness of the vehicle has been improved.In this paper,the crashworthiness optimization analysis of 100%frontal crash is carried out,which improves the crashworthiness of the whole vehicle.The results show that the above methods have certain engineering significance for the crashworthiness design under this condition,and also provide a guidance for the crashworthiness optimization design of the whole vehicle under other related crash conditions.