Finite Element Analysis And Lightweight Design Of Baja Cross-country Racing Frame

Under the background of "comprehensively strengthening ecological environment protection and resolutely fighting a tough battle against pollution",the skeleton of a certain Baha off-road racing car is taken as the research object in this paper conforming to the trend of energy saving and environmental protection equipment manufacturing..Combined with finite element analysis,experimental design and approximate model technique,a set of lightweight method for racing car frame is proposed.The main research contents and conclusions are as follows:-Construction of the finite element model of Baha off-road racing car skeletonBased on the design theory of the body frame,the model construction of the cab,frame structure,material and welding technology of the off-road racing car is carried out.In order to approximate to the actual frame as much as possible,the three-dimensional geometric model of the frame is established.Then,the skeleton of Baha off-road racing car is constructed by simplifying the skeleton,setting boundary conditions and the load.-Static performance analysis of the frame of Baha off-road racing carIn order to test whether the finite element model is in accordance with the reality,the finite element analysis is carried out on the car body skeleton.The load of the car in front,side,back and rolling collision conditions is measured,and the strength and stiffness of the body frame received during the collision is analyzed,which provides the basis for the analysis of subsequent size optimization.-Size optimization based on approximate model methodFirstly,the optimal Latin hypercube method is used to select seven parameters that have a great influence on the frame quality and performance as optimized objects,and the frame deterministic optimization model is established.Secondly,the particle swarm-support vector machine(PVM)approximate model is constructed based on DOE sampling and its accuracy is tested.Then,based on the approximate model,the lightweight design of the body frame is carried out and the optimal solution of each design variable is obtained.Finally,the basic performance of the optimized body frame is verified.The results show that the maximum stress and deformation have been improved,but the total mass has been reduced from 227 kg to 194 kg,which is 14.5% less than that of the previous 227 kg.To sum up,appropriate selection of materials,welding technology,finite element mesh accuracy,approximate model prediction accuracy and other problems having been taken into consideration,the lightweight design of the frame is carried out and the goal related is achieved in this paper.On the basis of finite element analysis,test design and size optimization of approximate model,the whole set of multi-condition lightweight process of the frame submitted in this paper can be instructive for the lightweight design of racing cars.