为有效地减少在装配仿真完成后进行机构运动仿真的前处理工作量,提高机构运动仿真的智能化程度,提出了一种在虚拟装配环境下面向运动仿真的机构运动副自动识别方法.通过提取虚拟装配环境下零部件间的装配约束信息,计算两个相连接零部件间所有约束的约束度,并利用计算所得的约束度自动映射出运动仿真机构中相应的运动副,为机构运动仿真中建立机构信息模型提供了基础信息.结合自主研发的原型系统虚拟装配工艺规划软件,给出了基于虚拟装配系统实现运动仿真的底层数据结构、机构模型的数据结构、信息传递过程和算法实现流程,并通过具体实例验证了方法的有效性.%In order to reduce the pretreatment workload of mechanism motion simulation effectively after finishing assembly simulation and enhance the automatic level of mechanism motion simulation, the automatic recognition method of kinematic pair oriented to motion simulation in virtual assembly environment was presented. The constraint degree of all constraints between two components (subassembly or part) was calculated by abstracting the assembly constraints information in virtual assembly environment, based on which kinematic pairs in the simulation mechanisms were mapped automatically so as to provide basic information for establishing mechanism information models during mechanism motion simulation. Combining with the prototype system Virtual Assembly Process Planning (VAPP),the infrastructure data modules, data structure of mechanism models, information transmission process and implementation steps for mechanisms motion simulation based on virtual assembly system were also proposed,the effectiveness of the method was validated by an example in the system.
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