The Finite Element Analysis & Optimization Of The Car-carried Skeleton Structure Based On ANSYS

Following the fast development of technology and production, the application of the finite element method is more and more popular. Nowadays a lot of enterprises, design departments and research departments use finite element method to do some numerical simulation of production process, numerical experiment of research and optimization design of production. The finite element analysis and optimization of production can check the intensity and stiffness, and also reduce the cost. So the finite element analysis and optimization of production are very important.The thesis discusses the structure of a car-carried skeleton. First, the author does some research on the topological structure of the car-carried skeleton. After a few finite element models that built by beam element in ANSYS are compared, the author gets the more reasonable topological structure. When the building of the finite element model of the skeleton structure is finished in ANSYS software, the skeleton structure's stress and deformation have been analyzed in four typical load cases based on the analysis of its working process. Then the computing result is compared with the experiment result, at the same time the modal analysis is done. After analyzing various kinds of data synthetically, the author sets up the equation of optimizing. Choose the weight of skeleton structure to be the goal function, the stress to be the restrain condition, and the sectional size of the frame to be design variable.The result in the most dangerous working status indicates that the intensity and stiffness of the skeleton structure is insufficient in the initial design, so the skeleton structure is improved. Then the author carries on the contrast to the result after improved and experiment result, and finds that the finite element model of the skeleton structure and boundary condition is reasonable. After the optimization, the author finds that the result is satisfying. The weight of the skeleton structure is reduced, at the same time the security of the skeleton is guaranteed. The result of research provides technical basis for the technicians to improve and optimize the skeleton structure.