| Since human beings invited automobiles,vehicle industry have innovated and developed continuously.Vehicles have the social responsibility as well as the ability to serve people.Under the background of the rising energy shortage,global warming and the pollution of environment,lightweight vehicle as an important method for saving energy and reducing emission is advocated largely by the industry.Meanwhile,the lightweight is more meaningful because it can also bring the improvement of the performance of vehicle.During the exploration of the lightweight,the idea of the designers presents diversities,and some obvious achievements have been obtained.The lightweight has become a hot topic of research field in vehicle industry.Because the mass of the vehicle’s body accounts for large percentage of the whole vehicle’s mass,the lightweight of vehicle’s body structure has a significant influence on the reduction of the whole vehicle’s mass.This paper referred to the relating research of the previous people,using a certain vehicle’s skeleton and establishing the mathematic model by Pro/E and ANSYS Workbench,aiming to reduce the weight of the vehicle,and conducting the research on the lightweight design of vehicle’s body structure base on finite element theory.At the same time,the strength and the stiffness of the vehicle’s body must be satisfied.The main achievements are shown as follows:1.A 3D model of the vehicle’s skeleton is established in Pro/E software,and a finite element model is also established by using ANSYS Workbench.2.The strength and stiffness of the vehicle’s skeleton as well as the modality are analyzed under two different conditions(bend and torsion),the deformation and stress distribution nephogram as well as the inherent frequency and vibration type of vehicle’s skeleton are obtained.3.A lightweight strategy is proposed,the design of the structure of the vehicle’s skeleton is performed by the topology and size optimization.It is worth mentioning that the weight of the vehicle has decreased by 4.86% after optimization.It is found that the stress level of the vehicle’s body structure is good,which meet the demands of strength and stiffness by performing a static analysis for the vehicle’s body.The material of the whole vehicle’s body is surplus.The lightweight of the vehicle’s skeleton is feasible,and the structure of the door should be strengthened.The vehicles’ body structure,after lightweight,can meet the demands of the strength and the stiffness.In addition,the deformation and stress level are good under all kinds of conditions after lightweight.The lightweight design of the vehicle’s body structure went well. |
