Research On Crashworthiness And Bionic Structural Design Of Automobile Anti-collision Beam

In today’s society where more and more attention is paid to lightweight,it has become infeasible to increase the crashworthiness of automobiles by merely increasing the structural thickness.How to meet the requirements of lightweight automotive design and ensure car safety is the focus of automotive designers.Therefore,it is necessary to carry out structural innovation design and parameter optimization for the crashworthy structure of the automobile.In addition,structural bionics is based on the structure and characteristics of graduate students,and as a design method based on innovative design.If the structure bionics is applied to the design of automobile crashworthy structure,it will undoubtedly expand the feasibility window for rapid optimization and innovation of products.This article mainly studies the following:(1)The crashworthiness comparison analysis of common anti-collision beams at the present stage is carried out.The factors affecting the crashworthiness of different structures are studied.The 3D modeling software SolidWorks is used to establish the thin-wall structure model of the anti-collision beam,and the finite element model is used to the ANSYS Workbench environment.Through LS-DYNA for impact simulation calculation and analysis,LS-PREPOST is used to obtain the crashworthiness performance parameters of the anti-collision beam thin-wall structure.(2)Using the similarity theory,the similarity analysis of the thin-wall structure of the automobile and the shell is carried out,and the rationality of using the shell as a prototype of a thin-walled biomimetic is demonstrated.On this basis,based on reverse engineering technology,the turtle shell point cloud data is obtained,and the 3D solid modeling is carried out.The finite element modeling and column collision analysis of the shell are carried out to obtain the surface shape,internal structure characteristics and mechanical properties of the shell.relationship.(3)Based on the characteristics of the surface of the shell,a bionic design criterion is proposed,and based on this criterion,the shape and rib bionic design of the thin-walledstructure of the anti-collision beam are carried out.For the bionic design space,after determining the design variables,the comprehensive performance index,namely the minimum impact peak value and the minimum dynamic balance index of the punching and deformation,is determined.The structural optimization mathematical model with the lightest quality and the smallest comprehensive index is established.The multi-objective optimization method is used to solve the problem,and the optimal structural size parameters of the bionic impact beam are obtained.(4)Two kinds of bionic beams were prepared by selective laser sintering technology.The load-displacement curves of the two beams were obtained by simulation experiments.The correctness of the simulation analysis was verified by comparing the deformation resistance of the two beams.