Research On Dynamic Data Exchange Based On STEP-OODB For Network-supported Collaborative Design

Data exchange is especially important in network-support collaborative design, and is the key to data integration, data exchange & share, data real time exchange, and data coherence. At present, most of the separate design systems are asynchronous systems that cannot freely synchronize while their data exchange model is file type and there is much of redundant data in the data transmission. These flaws cannot adapt to collaborative design system exchange data through internet because of that graphics file is often too large and present web bandwidth is a little narrow which cause to the graphics file data in-out at a workstation spending much of time and data exchange between designers being very difficult. So this cannot meet the demands of real time system.This paper had analyzed the data exchange, data transmission and data process of DDE in network-support collaborative design, and brought forward DDE model based in STEP-OODB. OODB is the key database, STEP is used as the data exchange criterion, and each CAD user can access the OODB at the same time so realize the data exchange and share in separate systems. Also, this paper had made a elementary research in the field of realizing real time DDE and data coherence between asynchronous CAD systems and multiply operating systems.This project had been assisted by the NSFC (No. 50175113), and mainly include the following topics:Summarized the present research status in the field of network-support collaborative design, probed into the key technology of real time collaborative design based on Internet. Introduced the construct of DDE of real time network-support collaborative design, and especially expounded on the data exchange form, real time, coherence, interoperate, management (data and vision), and concurrency control during the course of data exchange.Through the analysis of data exchange criterion, presented DDE organization model, method of data exchange and process of data exchange in network-support collaborative design based on the model of STEP-OODB and engineering database OODB. Expounded the details of three basic parts: client access of DDE, STEP-XML resolution, OODB management and concurrence control. Had finished the related part codes.In the Web condition of Pro/E 2000i being client based on Oracle database and JSP server, tested and validated the DDE system of STEP-OODB.