中文摘要：

在虚拟环境下结合虚拟装配技术实现机构的运动仿真是产品装配仿真的一个重要环节,在虚拟环境下完成产品的装配仿真后对其进行运动仿真可以为机构性能分析提供有效的参考数据,进而分析装配的合理性,提高装配质量.因此结合国内外机构运动仿真发展的现状,首先给出了在虚拟环境下基于虚拟装配技术实现机构运动仿真的基本思想和整体框架,通过具体实例提出利用几何法进行机构的运动仿真分析,及将对机构的运动规律分析转化为对基本单元的运动规律分析.同时提出了运动副的自动生成、运动机构的自动搜索及机构的识别等核心算法,有效地减少在虚拟环境下完成装配仿真后机构运动仿真前处理的工作量,提高了机构运动仿真的智能化程度.最后结合自主开发的原型系统虚拟装配工艺规划软件VAPP对相关算法进行了实现,并进行了实例验证.

英文摘要：

Mechanism motion simulation based on virtual assembly is a very important step to products assembly motion in virtual environment. Mechanism motion simulation after finishing assembly simulation in virtual environment can provide effective reference data for analyzing the mechanism performance so as to analyze whether the mechanism is logical and improve the quality of assembly. First of all, combined with the development of mechanism motion simulation both home and abroad, the essential idea and the whole frame of realizing the mechanism motion simulation based on virtual assembly technology are presented in virtual environment, and the geometrical method which is utilized to solve the problem and calculate the kinematic parameters of mechanism motion simulation is proposed by taking an example. Geometrical method divides one mechanism into some basal groups so as to analyze the kinematics regularity of these basal groups instead of analyzing the kinematics regularity of the whole mechanism. Secondly, the key algorithms of automatic recognition of kinematic pair, automatic search of mechanism and mechanism identification are discussed. These algorithms have important significance for reducing the workload of pretreatment of mechanism motion simulation after finishing assembly simulation in virtual environment so as to promote the level of automatization of simulation effectively. Finally, all the methods are implemented and validated in the prototype system the Virtual Assembly Process Planning （VAPP）.