Abstract: The interference calculation of irregular solid model is performed frequently when solving the complicated layout optimization problems based on Pro/E.The fast interference calculation becomes to the bottleneck of the layout optimization.Therefore，a solid model simplification approach is proposed by Pro/E secondary development.The method simplifies the solid model into bi-level model：The first level is the bounding box，while the second level is composed of regular geometry models.The experimental results show that，the proposed method outperforms the bounding box，the octree method and the conventional human-computer interactive method in form of the interference calculation efficiency and the calculation precision.

Key words: Pro/E, simplified solid model, bi-level model, interference calculation, layout optimization

摘要： 基于Pro/E环境求解诸如卫星舱的复杂布局优化问题，需要对3D不规则物体频繁进行干涉量计算，干涉量快速计算已成为实现复杂布局优化的瓶颈。基于Pro/E二次开发，将原实体简化为长方体包围盒和内含基本几何形体（长方体和圆柱）组合的双层逼近模型，实体简化模型干涉量计算归结为对包围盒内含基本几何体的计算，最后可以用Pro/E精确校验。经数值实验表明，该方法对原实体模型的逼近程度和计算耗时的均衡优于包围盒方法、八叉树方法和传统的全人机交互方法。

关键词: Pro/E, 简化实体模型, 双层逼近模型, 干涉量计算, 布局优化