| The application of the finite element method in the design of automotive products matures and achieved great results. The finite element technique used in automotive structural design analysis, suggest improvements to the structure to meet the strength and stiffness requirements, has become an important part of automotive design. Frame under a variety of complex loads from road and loading, and its design is reasonable or not directly related to the success or failure of the vehicle design, how to design a reasonable frame has become an important part of modern automotive design.In this paper, pure electric vehicle frame as the research object, the finite element method and the structure optimization theory has been used to simulate static and dynamic performance of the frame and topography optimization. At first, the frame structure is appropriately simplified, using Altair’s Hyper works software analysis frame static stress characteristics of the four typical conditions and obtained the stress and strain results of the frame; Secondly, frame modal analysis and the frequency response analysis to determine the frame modal parameters and frame key points in frequency excitation displacement response, provided the basis for the improvement of the dynamic performance of the frame structure; Finally, optimize the battery rack chassis part, and comparison the improved frame to the previous one.The study results indicate that the frame meets strength and stiffness requirements, but the amplitude that the bottom plate of the battery holder in the case of excitation by the low-frequency is too large. Topography optimization of the battery rack backplane largely improved static and dynamic performance of the battery rack backplane, the bottom plate of the battery holder in the low-frequency excitation the local maximum vibration amplitude is reduced by61mm to11.6mm, which makes the frame of the electric cars’ static and dynamic performance improvement. |
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