【作者】 万昌江；

【导师】 谭建荣；

【作者基本信息】 浙江大学 ， 机械设计及理论， 2005， 博士

【摘要】 本文系统研究了组件型数字化样机多层次协同建模理论及方法。基于装配模型与设计语义信息,自动构建机构模型;通过层次混合仿真建模,提高样机仿真过程中的交互实时性;通过数字化样机单元的组件化建模,建立了面向网络应用的协同装配及协同仿真服务,并进行了原型系统的开发。本文提出的理论和方法已在有关科研项目成功应用,并取得了良好的结果。 第一章首先综述了组件层次化建模技术、产品协同开发技术、数字化样机相关建模技术等研究及应用的发展现状,讨论了存在的问题。论述了组件型数字化样机多层次协同建模理论方法研究的意义及研究内容。 第二章讨论了面向数字化样机产品基本模型表达。首先建立了层次化的零件产品信息,以满足数字化样机不同分析的要求:通过装配模型的组织管理,为数字化样机的拆卸及机构信息的提取提供信息源;基于装配模型及工程语义信息,自动构建机构模型;集成分层次的零件信息模型、装配模型及机构模型,建立面向数字化样机的产品信息基本模型表达。 第三章建立了一种基于几何的含闭链数字化样机系统仿真求解算法。利用Lie群几何概念及指数积公式,建立主次关节运动学几何表达;基于次铰全自由度表达模型,推导闭链加速度约束等式;采用Baumgarte约束稳定性方法,利用关节刚体算法建立了含闭链数字化样机系统的几何求解算法。 第四章进行了面向数字化样机的层次混合仿真建模技术的研究。提出了一种基于实体一骨架混合仿真模型的运动仿真方法。根据仿真过程中的交互要求及数字化样机模型复杂程度的分析,调整仿真模型的组合表达形式,从而形成由实体模型、关节骨架模型及零件骨架模型组成的混合仿真模型。基于混合模型的运动仿真提高了仿真的交互实时性。 第五章进行了组件型数字化样机单元协同装配技术研究。为快速建立集成数字化样机模型,提出一种组件化协同装配方法。在该方法中,采用基于端口的建模方法,建立数字化样机单元的组件化表达。在此基础上,构建组件协同装配体系框架,将协同装配分解为连接元抓取拖动、装配预处理、组件装配三个基本过程。从而简化了装配过程,提高了组件装配建模速度。最后对组件协同装配解空间进行了分析。 第六章对组件型数字化样机协同仿真建模技术进行了研究。采用基于端口的组件建模方法,建立仿真元组件。以配置语义作为配置模板,快速建立仿真更多还原

【Abstract】 This paper researches the theory and method of multi-hierarchy collaborative modeling for component-based digital mock-up. Mechanism model is retrieved automatically based on assembly model and design semantics. The interactive and real-time characteristics during simulation are promoted through the hierarchical composite simulation modeling. The network oriented application services of collaborative assembly and simulation are setup through the component-based representation of the digital mock-up unit. A digital mock-up simulation prototype system is developed. The theory and method suggested have been successfully applied to some research projects, good results have been achieved.Chapter one first summarizes the status in quo of component-based and multi-level modeling technique, product collaborative development technique, and digital mock-up modeling technique, then discusses the existent problem. The research’s significance and the contents are discussed.Chapter two discusses the product basic model representation for digital mock-up. The hierarchical part model is established in order to satisfy the different analysis requirement for digital mock-up. The organization and management of assembly model provide the information source for disassembly of digital mock-up and the mechanism extraction. The mechanism model is setup automatically based on the assembly model and engineering semantics information. A basic information model for digital mock-up is produced by integration of hierarchical part information, assembly model and mechanism model.Chapter three sets up a geometry-based solution algorithm for digital mock-up consisting of closed kinematics loops. The kinematics geometric expression for primary and second joints is established using the Lie group geometric concept and exponential product formulation. The acceleration constraint equation is obtained based on the six DOF model of secondary joint. Using the Baumgarte constraint stabilization method and articulated body algorithm the geometry-based solution algorithm for digital mock-up consisting of closed kinematics loops is founded.Chapter four researches the hierarchical composite simulation modeling technique for digital mock-up. A kinetic simulation method based on solid-skeleton composite simulation model is suggested. The combination expression of simulation model is adjusted according to the interactive requirement and the analysis of the complexity of thedigital mock-up, the composite simulation model consisting of solid model, joint skeleton model and part skeleton model is produced. This method can realize the interactive and real-time characteristics of the simulation.Chapter five carries out the research of collaborative assembly for component-based digital mock-up unit. To set up integrated digital mock-up model rapidly, a component-based collaborative assembly method is presented. In this method a component-based representation of digital mock-up is established using the port-based modelling method. Based on the representation, collaborative assembly architecture is built. In this architecture the assembly process is divided into three basic steps: connection element grasp and drag, assembly pre-processing, component assembly. This method simplifies assembly process and improves the efficiency of assembly modelling. In the end the solution space of collaborative assembly is analysed.Chapter six researches collaborative simulation model technique for component-based digital mock-up. The simulation primary component is setup using the port-based modeling method based. The full connection between simulation components is established rapidly based on the configuration semantics as a configuration template. A simulation-oriented service architecture is setup based on the simulation component, configuration semantics and simulation collaborator. In this architecture two simulation mode are established: network collaborative simulation and local collaborative simulation.Chapter seven develops the prototype system for component-based digital mock-up simulation system and applies it into the practical product design. Based on the multi-hierarchy collaborative modeling theory and method for component digital mock-up the DMUSim system is developed, the shaft-piston mechanism of car engine, moon buggy, and Mini baja as the application examples are experimented on DMUSim.Chapter eight summarizes the research results of this paper, and gives the way for further research.更多还原