FEM Analysis And Optimization On Body Structure Of Hybrid Vehicle

To solve the global energy crisis and environmental pollution problems, people make every effort to study a new energy saving car, hybrid vehicles is the most promising products to achieve the market-oriented recently. Body structure design occupies an important position in the research and innovation of the car, and the safety of body structure is the designers’ primarily consideration.Therefore, it is critical to analysis the performance of body structure.First, on the basis of a deep research to body structure performance analysis of domestic and foreign.A hybrid vehicle named GR417 Z,which was self-developed and manufactured by automobile enterprises,was simplified in the condition of no affection to the mechanical properties of the body structure.And the body structure of the geometric modeling was carried out by a three-dimensional design software named CATIA.Secondly, geometric model of the car body structure was pretreated by ANSYS/Workbench and the finite element model of body structure was built.then the strength and stiffness of the body structure was analysised on four conditions and its safety was briefly evaluated. Through the freedom modal analysis to the body structure, it was found that the vehicle floor mutated locally and its structure design needs to be optimized.Finally, according to the optimal design theory, the body structure optimization model was built. Based on the sensitivity analysis, the thickness of the body parts of the floor were optimized.Then the optimized body structure was compared with original design scheme, and the optimization results was satisfied relatively.In this paper, the characteristics of the hybrid vehicles of GR417 Z body structure was analysised and a optimization scheme is proposed, which provides a reference to the body manufacturing in the future.