基于模型表示精度的装配干涉检测方法

Method for assembly interference detection based on MRT

为了提高装配规划和仿真过程中干涉检测结果的精度,基于模型表示精度定义干涉误差,提出基于模型表示精度的三角面片二维和三维求交方法,计算相交面片之间的干涉量,修正干涉量在误差范围内的面片关系,从而消除伪干涉。给出了改进的装配干涉检测算法和流程,根据检测对象的运动轨迹分别采用投影检测方法与多次检测方法,以在保证精度的同时达到高效率。该算法适用于任何形状和类型的曲面模型,且不需要几何拓扑结构与装配约束信息,具有广泛的应用性。在AeroAssem系统中实现了该方法,分别在几何可拆卸性分析与装配仿真中进行实例验证,证明了该方法的有效性和精确性。

To improve the efficiency of interference detection result in assembly planning and simulation process,the interference errors were defined based on Modeling Representation Tolerance（MRT）.The MRT based 2Dand 3D facet intersection test method was proposed to compute the interference quantity between the intersected facets and modify the facet relationships within the error range,so as to remove fake interference.An improved assembly interference detection algorithm was described.To achieve the efficiency and accuracy at the same time,the projective detection algorithm and discrete detection algorithm were respectively performed according to the target objects＇motion trajectory.All kinds of fake interference problems could be settled by this way,and the geometrical topology and assembly constraints data were not required anymore,so the application range of this method was broad.The proposed method was implemented by an assembly design system-AeroAssem,and its feasibility and effectiveness were demonstrated by case study in geometric dismountability analysis and assembly simulation.