Finite Element Simulation Analysis And Lightweight Design Of Automobile Door

The problems of resource abuse and environmental pollution have become more and more serious,the lightweight design of automobile components and structures have become a hot topic in the automobile industry.As one of the important components of automobile system,the performance of automobile door has a direct impact on the overall performance of the automobile.Based on the structural stiffness,NVH,weight reduction effect and other aspects,this paper adopts topological optimization and size optimization methods to study the lightweight of the automobile door.The main research contents and results are as follows:1.The finite element model of the automobile door is established with Hyper mesh pre-processing software.First,the CATIA 3D model for the automobile door is carded and meshed.Then the finite element model of the parts are connected by determining the connection mode between different parts of the door.Finally,the material properties of the parts are defined and the finite element model of the door is constructed.2.Finite element software is used to analyze the modal and structural stiffness of the door.Based on the finite element model of the door,the working conditions of droop stiffness,torsion stiffness,window frame stiffness,strip stiffness and free mode are established respectively.Optistruct is used to analyze the initial performance of the door,and it is found that the door meets the design standards of the enterprise,and there is a large space for lightweight.3.The process of experimental modal analysis and the matters needing attention in each step are introduced.The test mode of the actual door is analyzed with the test instrument of OROS.By comparing the experimental modal parameters with the theoretical modal parameters,it is found that the natural frequency error of each mode is within 5%,and the mode shape is similar,which verifies the accuracy of the finite element model.4.The finite element door topology is optimized.Taking the modal and stiffness of the door as the constraint conditions and the quality as the design objective,the optimal allocation of the door plate is made.Finally,the strengthening plate at the mouth of the outer plate is determined as the object of weight reduction to improve its structure.5.On the basis of topology optimization,the size of the automobile door is optimized,and the performance of the optimized door is checked,and the performance of the optimized door was checked.On the basis of ensuring the performance of the door,the size optimization is carried out to obtain the optimal thickness value of the parts,and the engineering modification is carried out.The performance of the modified model is checked and it conforms to the company standard.Finally,the weight reduction target of 0.83 kg is achieved.