基于几何约束的虚拟装配操作技术探讨

Study on Virtual Assembly Operation Technology Based on Geometry Constraint

为了解决虚拟环境下的装配操作问题,采用基于几何约束的方法,建立了基于层次约束结构的虚拟装配模型,对CAD系统的信息采用产品层、部件层、零件层、特征层、几何面层和面片层来表达,从而为虚拟环境下交互式装配和拆卸操作奠定了基础。提出了基于几何面约束求解的精确定位思想,给出了实现步骤,并探讨了该方法针对复合约束的应用情况。给出了几何约束动态识别的有效机制,通过碰撞检测、零件匹配、几何面匹配、优先关系选择等步骤提高约束识别的效率和准确性。实现了虚拟环境下零件的快速准确定位。

In order to solve assembly operation problem in virtual environment,a geometry constraint-based approach is proposed.A hierarchically constraints-based virtual assembly model is erected,which includes product layer,subassembly layer,part layer,feature layer,surface layer and polygon layer,to support interactive assembly and disassembly operation in virtual environment.The geometry surface based constraint solving method is proposed,the typical composite constraints recognization and application cases are studied,and the dynamic geometry constraint recognization algorithm is also discussed according to collision detection,part matching,surface matching and priority selection to improve efficiency and precision.On the basis of geometry constraint-based virtual assembly operation technology,the rapid and accurate part positioning and simulation can be realized in virtual environment.