Finite Element Analysis And Topology Optimization Of A Military Vehicle Body

This paper, basing on the invented body of some military vehicle, establishes the detailed finite element model in shell elements. The stiffness and modal characters of the skeleton-type body are gained qualitatively through static and dynamic analysis in order to test and verify the design. Furthermore, one modern and developing CAE optimization technology-topological optimization method based on FEM is presented to redesign the topological structure of the body frame. Some static and dynamic information about the optimized body is gained expecting to have the best body structure and give some instructive suggestion for the design of new body. At the same time, this paper explores preliminarily the topological optimization method in the vehicle body design. It improves modern design methods in vehicle bodies and has positive impacts on the efficiency and level of body design in our country.It is shown from study that the body strength is satisfactory but the body torsional stiffness a little insufficient. Obtaining the first ten independent frequencies, we know that the military vehicle has a high first frequency. So its dynamic characters are better than the similar.It is also shown from study that the performance parameters of the optimized body are improved to varying degrees, such as the mass reducing by 26%, torsional stiffness increasing by 1. 35 times and the first torsion frequency increasing by 38%, etc. So we can conclude that the topological optimization method based on FEM takes effect on the design of vehicle body structure. We can get a skeleton-type body structure with high stiffness by this means.