【作者】 杨刚；

【导师】 刘振宇；

【作者基本信息】 浙江大学 ， 机械工程， 2017， 硕士

【摘要】 复杂产品是机械、液压、电子、控制等多学科融合的系统,通常包含多个子系统,组成零部件数量众多、结构复杂。采用数字样机作业流程仿真技术可以直观地展示复杂产品的作业过程,从而验证产品作业功能设计的正确性。目前,作业流程仿真系统通常只是对作业动作的虚拟仿真,无法集成多学科仿真信息。由于复杂产品自身结构的复杂性,其作业流程仿真的流畅性也无法保障。本文针对上述问题,运用扩展场景图技术,实现了作业流程仿真多层级几何模型与多学科仿真信息的集成。本文主要内容包括:第一章介绍了复杂产品作业流程仿真的关键技术,综述了国内外研究现状,阐述了本文的研究内容和组织架构。第二章提出了复杂产品多学科集成扩展场景图的构建方法。首先分析传统场景图在多学科作业流程仿真中的不足,对场景图中的多学科数字样机节点进行了扩展;然后对扩展的多层级几何节点和多学科行为节点给出了形式化描述;最后构建了作业流程仿真的扩展场景图,实现了复杂产品多学科仿真模型的集成,为实现多学科集成的作业流程仿真奠定了基础。第三章提出了面向几何节点生成的装配体多层级筒化方法。首先基于特征识别对装配体实体模型的圆角过渡特征进行平角化,对装配孔与微小孔特征进行修补简化;然后将实体模型网格化,通过高斯映射对装配体网格模型进行面片聚类分割,经过多视点渲染识别内部隐藏零件和面片;最后进行装配模型的多层次细节网格简化,得到装配体多层级模型。第四章提出了基于CAE数据驱动的多学科行为节点解析方法。通过扩展场景图中多学科仿真行为节点完成了多学科CAE分析数据的集成,通过节点更新遍历实现了机构运动、云图绘制、流线绘制、曲线绘制仿真行为在作业流程仿真过程中的同步集成,最终实现了复杂产品多学科集成的作业流程仿真。第五章开发了工业汽轮机作业流程仿真系统,介绍了系统的架构和仿真的流程,实现了汽轮机多工况下的多学科集成作业仿真。第六章对论文的主要研究工作和创新成果进行了总结,并对今后的研究工作进行了展望。更多还原

【Abstract】 Complex products are mechanical,hydraulic,electronic,control and other multi-disciplinary integration system.Complex products usually contain multiple subsystems,composed of a large number of complex parts.The use of digital prototyping operation simulation technology can visually show the process of complex products to verify the correctness of product design.At present,the operation simulation system can not integrate multidisciplinary simulation information.Due to the complexity of the complex product,the fluency of the operation process simulation can not be guaranteed.In this paper,the use of the extended scene graph technique can realize the integration of multi-level geometric model and multidisciplinary simulation information of operation simulation.The main contents of this paper include:The first chapter introduces the key technology of process simulation of complex products,summarizes the research status at home and abroad,and expounds the research content and organizational structure of this paper.The second chapter puts forward the construction method of multidisciplinary integrated extended scene graph of complex product.Firstly,the shortcomings of traditional scene graphs in multidisciplinary operation simulation are analyzed,and the multidisciplinary digital prototyping nodes in the scene are expanded.Then,the extended multi-level geometric nodes and multidisciplinary behavior nodes are given a formal description.Finally,The extended scene graph of operation simulation is constructed,which integrates the multidisciplinary simulation model of complex products and lays the foundation for the realization of multidisciplinary integration operation simulation.The third chapter presents a multi-level simplification method for assembly based on geometric nodes.Firstly,based on feature recognition,the fillet transition characteristics of the solid model of the assembly are flattened,and the characteristics of the fitting hole and the small hole are simplified.Then,the solid model is meshed and the lattice polygons are modeled by Gaussian mapping.Class segmentation,through the multi-view rendering to identify the internal hidden parts and dough;Finally,Through the multi-level detail grid of the assembly model,the multi-level model of the assembly is obtained.The fourth chapter presents a multi-disciplinary behavior node analysis method based on CAE data.The integration of multidisciplinary CAE analysis data is completed by extending the multidisciplinary simulation behavior node in the scene graph.The synchronization of the motion,cloud drawing,streamline drawing and curve drawing simulation in the process flow simulation is realized by node updating traversal.And finally to achieve a complex product multi-disciplinary integration of the operational process simulation.The fifth chapter develops the simulation system of industrial steam turbine operation process,introduces the architecture of the system and the simulation process,and realizes the multidisciplinary integration operation simulation under the multi-operation condition of the steam turbine.The sixth chapter summarizes the main research work and innovation achievements of the paper,and prospects the future research work.更多还原