The Finite Element Analysis And Research On Topology Optimization Technology For Vehicle Frame Basde On ANSYS Workbench

As an important part of the electric railcar, the frame bears all kinds of complex loads from the process of moving, the frame’s performance is directly related to the vehicle’s performance. Frame will bear the shear strength and bending moment from the shear and bending loads. And it will bear the stimulation from motor vibration and transmission imbalance, so the frame design is very important for the vehicle’s performance of electric railcar. The frame’s performance of finite element method and topological optimization techniques for frame design can enhance the static and dynamic performance of vehicle.This paper researches the structure of the electric railcar, using ANSYS Workbench establish the finite element model of original frame, and calculate the strength properties and modal performance of frame. Confirming the performance of the original frame structure meets the design criteria. The variable density method of topological optimization is employed to optimize the original frame structure, some parts and frame are redesigned based on topology, some strength and modal performance of the new frame structure are researched particularly. So as to improve the performance of the frame structure and vehicle, and provide a theoretical basis for the design of frame structure.Comparing with the performance parameters of the new frame structure, this paper certificates that the finite element model of the new frame structure and boundary conditions are reasonable. The topology optimization show that the bending strength and torsional stiffness of new frame have a certain margin improved after topology optimization, especially for torsional stiffness. The dynamic performance of the frame also has greatly improved, and low order modal frequency has a greater increase. So that the new frame structure effectively avoid the larger vibration.The performance analysis results indicate that FEM and topological optimization has good applicability for frame design. using this optimization can greatly improve the vehicle stiffness, reduce weight and effectively reduce vibration of frame structure in the practical application.