Research on Lightweight of a Light Commercial Vehicle Frame Under Multi Performance Constraints
In order to improve the reliability of a commercial vehicle and reduce the production cost,the optimization method based on agent model is adopted to carry out the lightweight design of its frame for static and dynamic performance.Based on Hy-perworks,the finite element model of the frame is established and the static and dynamic performance is analyzed.Through the sensitivity analysis of the frame,17key parts including the longitudinal beam are determined.Taking the thickness of key parts as the design variable,considering the static and dynamic performance constraints,combined with the radial basis function(RBF)proxy model,the lightweight optimization design model of the frame is constructed.The optimal solution set of the distance from each point to the origin is determined by using the multi-objective genetic algorithm(NSGA-Ⅱ)and the cooperative minimum distance method.The simulation analysis of the optimized frame shows that the weight of the frame is reduced by 5.6kg,the first-order modal frequency in the static and dynamic performance of the frame is increased by 1.45%,while the bending and torsional stiffness are reduced by less than 4%.At the same time,the reliability of the optimized frame is verified and fed back by the fatigue life simulation test.
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