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To support modular fixture assembly design in virtual environment, a multi-view based modular fixture virtual assembly model is proposed. Instead of squeezing all assembly related information into a single model, three complementary views of assembly model, element information, function and structure, and assembly relationship are proposed to be used. The first view contains the detailed element information, while the other two explicitly capture the hierarchical function relationships and mating relationships respectively. These views are complementary in the sense that each view only contains a specific aspect of assembly related information while together they include required assembly related information. The proposed assembly model is specialized to accommodate the features of modular fixture virtual assembly design and applied in our developed prototype system. 相似文献
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对设计者交互操作的准确理解和快速响应,是提高虚拟装配的可操作性和实用性的关键问题.定义了一种层次时间有色Petri网(HTCPN),并以此为工具建立了虚拟装配环境下的交互管理模型.该模型以设计者操纵数据手套的位姿变换信息、对象间的碰撞检测信息以及装配约束识别信息作为输入,运行后输出具体的操作事件实现设计者在虚拟装配环境中的浏览、移动零部件、装配和拆卸调整等一系列交互操作活动.实践证明该模型满足了虚拟环境的实时和并发等动态性能要求,实现了虚拟装配过程中大量离散事件的处理及操作意图的响应. 相似文献
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Due to the complex, uncertainty and dynamics in the modern manufacturing environment, a flexible and robust shop floor scheduler is essential to achieve the production goals. A design framework of a shop floor dynamical scheduler is presented in this paper. The workflow and function modules of the scheduler are discussed in detail. A multi-step adaptive scheduling strategy and a process specification language, which is an ontology-based representation of process plan, are utilized in the proposed scheduler. The scheduler acquires the dispatching rule from the knowledge base and uses the buildin on-line simulator to evaluate the obtained rule. These technologies enable the scheduler to improve its fine-tune ability and effectively transfer process information into other heterogeneous information systems in a shop floor. The effectiveness of the suggested structure will be demonstrated via its application in the scheduling system of a manufacturing enterprise. 相似文献
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