Research On Web-based Component Repository System For Complex Product Rapid Design

Product rapid design technology is moving towards digital, modular, parametric and net-work collaborative direction, whose core is the optimization and reconstruction of existingdesign resources to get the market needed products, and sharing and reuse of design resourcesis the fundamental guarantee to realize rapid product design. And the complex product is akind of product that includes a number of components, whose structure is complex and re-quires so many resources to be manufactured and assembled. Therefore，under the cloudmanufacturing environment, complex product design and manufacturing enterprises must takeadvantage of networked and integrated information management system to effectively organ-ize, manage and reuse its internal and external parts design and manufacturing resources. Forsupporting the rapid design of complex products, several key technologies of integrated man-agement of parts resource were studied from three levels: the framework&hierarchy, the keytechnologies and system development application. And on this basis, a networked componentrepository was designed and the prototype system was developed to be embedded to the cloudplatform for application.Firstly, the framework of parts resource library system was given, which could supportrapid design of complex product, and the application mode and functional requirements ofsystem were analyzed. Upon these, the main function modules and architecture of system wasdesigned. Furthermore, the key technologies of developing parts resource library system wasbuilt from aspects of target layer, method layer and supporting technology layer.Secondly, the modeling method, expression way and storage mode for the component re-pository ontology were mainly focused on. PLIB ontology and its standard meta-model wereintroduced and extended by adding feature ontology description layer and the operationallayer, and then the component repository ontology model based on meta-model was displayed.Then, Web Ontology Language (OWL) was chosen to describe this ontology and in order toefficiently store and manage it. Further more, a method to storing mass web ontology wasproposed on the basis of the mixed relational database storage model, after analyzing the characteristic of OWL form words and component repository ontology.Thirdly, three most important key technologies on the construction of networked compo-nent repository were discussed: Firstly, in allusion to the high degree of standardization andgeneralization of parts resource, a field oriented general classification pattern was established,and a multistage and multi-level flexible coding structure model was constructed on the par-allel encoding scheme. Secondly, the initial ontology library construction and dynamic exten-sion methods were given, and the framework for extracting parts repository ontology from theexisting heterogeneous CAD models resource was provided to expand the parts repositoryautomatically, combined with the reverse engineering idea. Finally, after analyzing the detaillevels of parts resource data stored in an XML document, a fine-grained access controlmethod to parts repository system was proposed based on XML-XSLT to realize sophisticatedcontrol of parts resource data and operations and to meet the security demands of network in-formation system to be practical.Fourthly, considering the features of distributed, heterogeneous and autonomous in partsresource library system under web environment, the dynamic integration approach and appli-cation mode of the distributed parts resource library were analyzed. At first, ontology-drivenintegration and application framework of distributed parts resource library was proposed, andthe construction method and automatic integrated algorithm among local parts resource library.At the same time, the WEB service technology was introduced to realize loose coupling vir-tual integration of distributed heterogeneous parts library resources, and the service interfaceencapsulation method of parts library resources and its application process were analyzed. Inweb parts library, there were three ways to retrieval parts: by the parts hierarchy tree, by thekey words of parts family’s name, or by the combination of semantic features. And the com-plex product rapid design process, based on reuse of parts resource and the general structuralmodel of product family, was discussed at last.Lastly, on the research theories and key technologies discussed above, a prototype systemwas developed by comprehensively utilizing the secondary development technology for3DCAD software and the advanced network technologies such as Web2.0, ADO.NET, ASP.NET, AJAX, Web3D, etc. And the needed hardware and software of the system operation and theimportant function module realization process and examples were given. Then, it is embeddedto the cloud platform as an industry cloud service for applying in the rapid design process ofthe large wind power generators, the energy saving pumping unit and other complex products.It also validated the feasibility of the theories mentioned in dissertation and the developedsystem.