Research And Application Of Collision Detection Technology In Visual Assembly Systems

This paper first introduced the present status of rapid development of high-speed railway and a lot of EMU were put into use in china, analyzed the problem of the traditional mode of assembly can not satisfy the EMU's production and maintenance, and then put forward the task about study and development on the virtual assembly system for EMU.Collision detection is an important component element in virtual assembly system, and exact collection detection is very important to improve the reliability of the assembly simulation and enhance the rationality of assembly path. The algorithms of collision detection are studied in this paper deeply, which contains the following parts:(1) Firstly, the present situation, the basic principle, the classification, the general framework and the key technology of collision detection algorithm are introduced briefly. Then several common bounding volume hierarchy (BVH) algorithms including sphere, AABB, OBB, and k-Dops are investigated systematically. Next, these BVH methods are compared and analyzed.(2) Based on the intensive survey and comprehensive analyses of various approaches to collision detection, we select the most effective algorithm in such situation which is called hierarchical AABB algorithm as the core technique in this virtual assembly system. At the same time, the collision detection algorithms based on AABB are researched, and the memory usage is optimized. Moreover, a new and more accurate triangle-AABB test is used instead of AABB-AABB test to improve the efficiency of the system.(3) According to the above researches, by using of OSG, collision detection function of the virtual assembly system is developed in the platform of VS2005.