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 c...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.展开更多
In this paper,a synthesized technique is explored through design of a virtual experiment system for main aero-engine based on VR,which attempts to integrate some VR techniques,such as 3D stereo simulation and modeling...In this paper,a synthesized technique is explored through design of a virtual experiment system for main aero-engine based on VR,which attempts to integrate some VR techniques,such as 3D stereo simulation and modeling,3D scene management and human-computer virtual assembly based on data glove and collision detection.The geometry modeling and instantiation technique,virtual hand modeling and data glove interaction technique are discussed chiefly.Finally,taking aim at assembling and dismantling experiment system of a certain aero-engine,interface technology is expounded also.展开更多
Based on the analysis of characteristic of cable harness planning in virtual environment,a discrete control node modeling (DCNM) method of cable harness in virtual environment and the cable harness assembly routing te...Based on the analysis of characteristic of cable harness planning in virtual environment,a discrete control node modeling (DCNM) method of cable harness in virtual environment and the cable harness assembly routing technique based on it are proposed. DCNM converts a cable harness into continuous flexed line segments connected by a series of section center points,and the design can realize cable harness planning through controlling those control nodes. This method of cable harness routing in the virtual environment breaks the status that virtual assembly process planning is just suitable for the rigid components at present,and impulse the virtual assembly process planning to be more practical. Relation algorithms have been verified in a self-developed system named virtual cable harness assembly planning (VCHAP) system,and this VCHAP system has been applied in assembly process planning of aerospace-related products.展开更多
The whole superconducting HT-7U Tokamak is a high-cost and large-scale complicated device. The assembly requirement of HT-7U device is arduous and strict. At present, there have been no guiding principle for the assem...The whole superconducting HT-7U Tokamak is a high-cost and large-scale complicated device. The assembly requirement of HT-7U device is arduous and strict. At present, there have been no guiding principle for the assembly of the device, but assembly simulation can help the engineer plan and make decision by an intuitional and visual way before its actual assembly. The problem is that which scheme is most suitable should be solved primarily. From current research situation and technology progress of assembly simulation, this paper explained and analyzed four kinds of technological schemes of assembly simulation in common use. Finally, we got the most feasible scheme that was suitable for HT-7U assembly simulation by comparing their technological issues and difficult points of simulation among the four kinds of feasible schemes。展开更多
针对煤矿装备虚拟装配应用问题,基于Visual Studio 2010、OSG、Cegui、VC++等软件平台和相关硬件设备,搭建了功能完整、使用方便、交互性好、沉浸感强的某型号电牵引采煤机虚拟现实装配应用系统,详细描述了系统的功能结构、技术方案与...针对煤矿装备虚拟装配应用问题,基于Visual Studio 2010、OSG、Cegui、VC++等软件平台和相关硬件设备,搭建了功能完整、使用方便、交互性好、沉浸感强的某型号电牵引采煤机虚拟现实装配应用系统,详细描述了系统的功能结构、技术方案与构建方法;针对构建方法中的模型制作技术,结合UG与3Ds Max的建模优势,提出先在UG中建立CAD精确模型,后利用3Ds Max对模型进行转换、修改、优化和渲染,最终生成高质量虚拟现实模型的模型处理方法,弥补了艺术类模型装配精度较低和工程CAD模型很难直接生成虚拟现实模型的不足。展开更多
文摘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.
文摘In this paper,a synthesized technique is explored through design of a virtual experiment system for main aero-engine based on VR,which attempts to integrate some VR techniques,such as 3D stereo simulation and modeling,3D scene management and human-computer virtual assembly based on data glove and collision detection.The geometry modeling and instantiation technique,virtual hand modeling and data glove interaction technique are discussed chiefly.Finally,taking aim at assembling and dismantling experiment system of a certain aero-engine,interface technology is expounded also.
基金Sponsored by the National Natural Science Foundation,China(No.50475162)
文摘Based on the analysis of characteristic of cable harness planning in virtual environment,a discrete control node modeling (DCNM) method of cable harness in virtual environment and the cable harness assembly routing technique based on it are proposed. DCNM converts a cable harness into continuous flexed line segments connected by a series of section center points,and the design can realize cable harness planning through controlling those control nodes. This method of cable harness routing in the virtual environment breaks the status that virtual assembly process planning is just suitable for the rigid components at present,and impulse the virtual assembly process planning to be more practical. Relation algorithms have been verified in a self-developed system named virtual cable harness assembly planning (VCHAP) system,and this VCHAP system has been applied in assembly process planning of aerospace-related products.
基金National Nature Science Foundation of China(No.60273044)Nature Science Foundation of Anhui Province(No.01042201)
文摘The whole superconducting HT-7U Tokamak is a high-cost and large-scale complicated device. The assembly requirement of HT-7U device is arduous and strict. At present, there have been no guiding principle for the assembly of the device, but assembly simulation can help the engineer plan and make decision by an intuitional and visual way before its actual assembly. The problem is that which scheme is most suitable should be solved primarily. From current research situation and technology progress of assembly simulation, this paper explained and analyzed four kinds of technological schemes of assembly simulation in common use. Finally, we got the most feasible scheme that was suitable for HT-7U assembly simulation by comparing their technological issues and difficult points of simulation among the four kinds of feasible schemes。
文摘针对煤矿装备虚拟装配应用问题,基于Visual Studio 2010、OSG、Cegui、VC++等软件平台和相关硬件设备,搭建了功能完整、使用方便、交互性好、沉浸感强的某型号电牵引采煤机虚拟现实装配应用系统,详细描述了系统的功能结构、技术方案与构建方法;针对构建方法中的模型制作技术,结合UG与3Ds Max的建模优势,提出先在UG中建立CAD精确模型,后利用3Ds Max对模型进行转换、修改、优化和渲染,最终生成高质量虚拟现实模型的模型处理方法,弥补了艺术类模型装配精度较低和工程CAD模型很难直接生成虚拟现实模型的不足。
