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Semantic-based virtual assembly modeling and assembly operations Reasoning Research and Application

Author: XiaZhiXiang
Tutor: FanXiuMin
School: Shanghai Jiaotong University
Course: Mechanical Manufacturing and Automation
Keywords: Virtual Assembly Semantic assembly Product assembly information modeling Semantic recognition Semantic Navigation
CLC: TG95
Type: Master's thesis
Year: 2009
Downloads: 128
Quote: 3
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Abstract


In product design, assembly processes that affect the cost of product development cycles and one important factor. Assembly process planning is an important part of planning, affecting the operation of a single station assembly labor intensity and work efficiency. Based on virtual reality technology assembly process planning for the digital product assembly planning provides new ways and methods to test in such a virtual assembly environment, people are still among the main body assembly operations carried out in the computer software system while still full of intelligence to develop people's knowledge and experience, but also assembly process planning research and development of a new trend. This paper studies the semantic model for product assembly modeling and generation method and semantic-based natural freehand interactive virtual assembly methods of operation, assembly process planning in virtual assembly process lay the foundation for access to information. Assembly tasks from both levels of intention to capture user interaction, in a virtual environment allows users to conveniently and accurately assembled, so that the efficiency of assembly operations has improved significantly. First of all interactive virtual assembly operations semantic modeling the functional requirements are analyzed based on the assembly of this semantic definition. Then the assembly semantics definitions to functional characteristics as the main reference on the assembly between the semantic components are classified from the top. Finally, to support the assembly of semantics, semantic-based product assembly proposed information modeling, and detailed description of the part model, assembly tree model, constraint model and semantic model, as well as the intrinsic link between them. Secondly, the design of the CAD system generates the product assembly information model. The basic idea is first accessed through two recursive traversal of the assembly tree structure of the current model, the first recursive traversal part data and assembly of data obtained some information, such as: the path component parts and assemblies, local transformation matrix, hierarchies, etc.; Section recursive traversal constrained data obtained secondary information, such as: the constraint type, offset value, constrained component geometry and assembly reference geometry referenced item items, etc.; then defined on the basis of an interactive assembly semantics. In this process, in order to determine the constraints involved, semantic find a match, so the semantic input parameters. Again, proposed and implemented in a virtual environment for semantic reasoning methods, including semantic identification, validation, navigation, and solver; virtual hand with one hand and in the process of semantic interoperability approach, including the virtual hand crawl process the move and release process for semantic processing algorithms, and for the hands conflicts that occur during the operation proposed solutions. Finally, the above methods and techniques applied to the \

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Fitter process and assembly process > Machine assembly, machine installation method
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