针对虚拟装配系统中装配操作精度和效率低的问题,文中提出了基于约束元素包围盒的装配意图捕捉方法,根据约束元素的特征参数和配合类型,将位姿变换分解为点到线上、点到面上和直线平行3种位姿变换情况,提出基于位姿变换元素分解的约束精确定位求解算法,并通过对零件自由度的求解和目标约束方向上的运动分量映射,实现了零件的装配运动引导.最后通过一个典型装配结构的实例,给出了装配操作的交互辅助流程,验证了算法的有效性.该算法已应用到面向航天产品的桌面虚拟装配系统中.

In order to improve the precision and efficiency of assembly manipulation in virtual assembly systems,first,a method to capture the assembly intention is proposed based on the constraint element-bounding box.Next,according to the feature parameters and fitting types of constraint elements,the pose transform is classifed into three cases： placing a point onto a line,placing a point onto a plane and being parallel a line to a line.Then,a precise positioning solving algorithm of constraints is proposed based on the pose transform of element decomposition.Moreover,the motion navigation for assembly is realized by solving the degree of freedom of the parts and mapping the motion component in the target constraint direction.Finally,a typical assembly case is studied to present the interactive aid process of assembly manipulation and demonstrate the effectiveness of the algorithm.The proposed algorithm has been successfully applied to the desktop virtual assembly system for aerospace products.