Research On Finite Element Simulation Method For A Microbus And Optimization Design Of A-pillar Collision-resistance

The popularity of vehicle in people's lives has made the safety of vehicle a problem that people are increasingly concerned about.Rollover crash is a special type of automobile safety accident.The incidence of rollover crash is low,while the fatality rate is really high.The ever-increasing market share of SUVs and minibuses in the domestic passenger car market makes the research on the rollover safety of vehicle more and more important.This paper selects a minibus as the research object,makes reference to the rollover laws and regulations of U.S.vehicles and conducts finite element simulations.The finite element simulation model is used to optimize the plate thickness of the car's A-pillar and strengthen the design of foamed aluminum filled pipes.The rollover feature of the minibus and the finite element simulation method improve the rollover safety of the vehicle.At present,finite element simulation is the most commonly used simulation method in the field of passive safety of vehicles.Compared with conventional collision types,vehicle rollover collisions have the following characteristics: First,the duration of rollover crash is longer.Second,the motion range of the vehicle is relatively large during collisions.Third,the attitude of the vehicle changes violently during the collision.Therefore,it is very difficult for the vehicle to simulate the rollover crash condition.This paper investigates the finite element simulation method of rollover for a minibus,and compares the simulation results with the test to verify the accuracy of the simulation method.To solve the problem of the requirement for excessively high computer performance in the finite element simulation of the vehicle rollover crash,two rollover simplification models are proposed and their reliability is verified,which provides a feasible solution for the further safety research of rollover.Through the analysis of the rolling test and simulation results of the entire vehicle,it is found that the A-pillar deformation during the rollover process is large and seriously affects the living space of the occupants.This paper proposes two project design for this problem: The first is to use a multi-objective optimization method to find the optimal combination of plate thickness without changing the material and structure.The second method is to strengthen the A-pillars by means of foamed aluminum filled tubes.The energy absorption characteristics of the foamed aluminum suction-filled tubes are studied,and the optimized parameters of the foamed aluminum-filled tubes are selected by optimizing methods to optimize the foamed aluminum-filled tube structure.They were applied to the initial model and the plate thickness optimization model respectively.Finally,an optimal scheme for the crashworthiness of the A-pillar combined with the thickness optimization of the plate and the reinforcement by foamed aluminum filled tube was obtained.