客车改型及其多目标优化

With the rapid development of the domestic market of coaches, coach modification is particularly important. However, based on the traditional finite element method, to retrofit a coach, a new geometry model needs to be built. Even more, it takes a lot of people quite a long time to mesh the geometry model. The cycles of conventional methods is too long to adapt to rapid retrofit design, especially in the fierce competition markets. The huge costs and much of manpower makes it uneasy to suit the markets demands.In the field of auto-body CAE, retrofit design of coach which is based on the mesh morphing method is an emerging method. It works on finite element model directly, so as to avoid building geometry model and meshing process. So the method is able to complete modification quickly. It has short cycle, low cost and quick effect.This paper aims at using mesh morphing to finish the coach retrofit design. The final purpose is to get a longer, higher and wider coach. Further, choosing properly parameters of the coach to finish multi-objective optimization.