Structural Analysis And Optimization Of A Vehicle Door

The progress of automotive technology is largely due to blood and accidents,so much of the progress of cars is due to safety concerns.From historical data on mortality and injury rates caused by car collisions,side collisions come first.Although airbags and seat belts are installed on the steering wheel and doors as a precaution,they do not guarantee the safety of passengers.Because the doors are so close to each other and if the doors are not properly structured or their strength is too low.In addition,the door as the only access to the passenger and passenger compartment,must be able to ensure adequate opening and closing,in traffic accidents,even if the vehicle is squeezed deformation,but also to ensure that the door can be opened normally.Therefore,on the basis of a large number of research at home and abroad,according to the door of a car model in my laboratory,statics,dynamic,stiffness and modal analysis are carried out within the effective range of ensuring the stiffness of each component.At the same time,according to the low-order mode,the structure optimization and lightweight design of the door are studied under the condition of avoiding the excitation frequency such as engine and pavement.The following are specific elements:(1)Finite element model of door structure.The specific process of modeling,material properties,thickness and other parameters are briefly described,and the grid division is carried out on the basis of modeling,and the finite element model is finally determined.2)Modal analysis and modal test of the door.This paper expounds the related theory of modal analysis,analyzes the constraint mode of the door in the finite element software,then carries on the modal analysis to the first order mode and the vibration pattern,in order to verify the correctness of the established finite element model,through the modal test of the solid door,proves the correctness of the finite element model.(3)Analysis of the stiffness of the door.Using Hypermesh commercial finite element software to analyze the doors under different working conditions and different loads,the torsional stiffness and sinking stiffness of the doors under various working conditions are obtained.(4)Sensitivity analysis.Based on the sensitivity analysis method,a multi-index comprehensive evaluation method combining standardized processing method and orthogonal test is proposed to screen the door parts which have a great influence on the performance of the door.(5)The structure optimization design of the door.Using the optimal Latin hyper-cubic test design method,the original thickness of the optimized design variable 20% was sampled,and then the finite element model was used to calculate the complete sample space,and the approximate model was established by this sample,and then the optimization design and lightweight of the door were carried out,and finally the optimization results were the basis,The finite element model is improved to improve the reliability of the approximate model.