基于拓扑优化的电动接驳车骨架轻量化设计OA

With the increasing demand for electric shuttle buses in scenic areas,this bus type has experienced rapid development.To reduce the high production and operating costs of existing electric shuttle buses,the lightweight design of the shuttle bus was carried out.HyperMesh software was used to establish a finite element model of the frame of an electric barge,and the lightweight multi-objective optimization design was carried out.Subsequently,the topology optimization of the chassis frame was carried out by taking the minimum flexibility of the bus frame as the objective function,the relative density of the structural units as the design variable,and the volume fraction of the design area as the constraint.Sensitivity analysis was used to calculate the relative sensitivities of the modal and braking conditions to the maximum stress on the mass,and the components with smaller absolute values of the relative sensitivities were selected,and the frame was optimized in terms of size with the thickness of these components as the design variable.Considering that the barge is mostly used on slopes and has a high power demand when fully loaded,the mechanical performance analysis and free modal analysis of the frame of the electric barge were carried out under three working conditions:constant speed driving,emergency braking and emergency turning under full load.Comparative results before and after optimization indicate that,while satisfying the strength requirements under all operating conditions,the optimized shuttle bus frame achieved a mass reduction of 107 kg,corresponding to a mass reduction rate of 5.1%.