The Technology Of Mechanical System Simulation Applied In Automobile Knockdown Transmission

In this paper, the technology of mechanical system simulation based on 3D parameterized modeling (CAD), finite element analysis for structure (FEA), multi-body system dynamical analysis (MBS) and optimization design (OPT) is put forward with its basic theory and method. One kind of automobile knockdown transmission is regarded as the researched object, the 3D models of its components are built up with the software Pro/Engineer inheriting the theory of 3D parameterized modeling, and then the 3D assembly models for every gear are built up according to related assembling character. Both these models are preparing for FEA and MBS models. With the FEA software ANSYS, mode analysis and transient analysis for key accessories, such as auxiliary gearbox are processed. According to the way of actually connecting with each other, the rigid multi-body dynamical model and the dynamical model composed of some rigid bodies and some flexible bodies are set up with the multi-body system dynamical simulation software ADAMS, many specialities of dynamic response for them are analyzed and contrasted. Finally, in order to the structure FEA results, some improved schemes and the most advanced optimization design method are supplied. The FEA results of auxiliary gearbox are consistent with the structural disadvantages of its practical products, the MBS analyses results for knockdown transmission accord with the practical activities, the same structural disadvantages never appear in the products based on the second improved design, which is proved to be rigidly effective by the market.