关键词: 碰撞检测, 包围盒, 八叉树, 分离轴理论, 避涉策略, 整体叶盘

Abstract: To effectively solve the problem of grinding tool collision in the blisk grinding and polishing process,a collision detection algorithm combining accuracy and efficiency and an avoidance strategy for different collision modes were proposed.The grinding tool was modeled by hierarchical Oriented Bounding Box (OBB) and the machining space was divided by octree method.The stratified rough check was applied to judge whether or not the collision between the processing space and the grinding tool was existed in OBB.The leaf nodes that detected the collision were accurately identified by separation axis theory.Further,the relevant pose parameters of the grinding tool and the bounding box were adaptively adjusted to avoid interference according to different collision modes.According to the proposed collision detection algorithm and avoidance strategy,a visualization software was developed to effectively realize the collision detection and avoidance during the blisk grinding and polishing processing.At the same time,an experiment of blisk grinding and polishing was also conducted out in a large aero-engine enterprise and the results showed that the proposed algorithm and software could better meet the requirements of collision avoidance and processing quality of the blisk surface.

Key words: collision detection, bounding box, octree, separation axis theory, avoidance strategy, blisk