The Key Technology Research, For Product Data Management (pdm)

Digital information has become the basis on which enterprise's operation depends, with more and more products data, including drawings, specifications and E-mails, are stored in computer. Searching and sharing in such enormous data has become very difficult. After application of CAD/CAE/CAM technology, most enterprises are making efforts to find a way to improve their product design; reduce time to market and lower manufacturing costs. It is required that designer should consider assembly, manufacturing on the early stage of product development. It is so-called "Concurrent Engineering". Product data management (PDM) is considered to be the ideal platform to implement concurrent engineering. It is also a power tool in integrating enterprise's various information systems.Distributed data management and cooperative workflow management are the key points in a PDM implementation. This paper mainly focuses on these two aspects, and has done global research work about them, which concerns concept, principle and realization. Paper also builds information model in terms of idea of concurrent engineering, and points out the way to realize the functions discussed using object-oriented software development technology.This paper expatiates on the PDM definition and its scope; discusses its structure and main functions. Meanwhile, thesis focuses on PDM detailed functions like data vault & document management, workflow management, and product structure & configuration management. Then paper explains the idea of concurrent engineering, points out two key technologies in the implementation of concurrent engineering: concurrent management method based on teamwork and concurrent design method supported by networked computer systems.The paper discusses basic theory of database; then discusses server/client network computing model which distributed data management relies on. Paper also proposes a layered data storage structure according to different users' level on network. Finally the paper gives an approach called X-locks to solve the conflicts occurring in database concurrent access.Enterprises' organization structure and team management are discussed also. Then the paper explains many concepts, which related with each other but have different meanings: user, account, member, role, and team. An embedded model of concurrent workflow is put forward. The paper builds an information model of workflow management; studies the procedure transformation conditions.Thesis applies object-oriented analysis in the development of PDM system; studies relationship between these objects. As a result of theory discussed above, an instance, XIJI-PDM system, which was developed for Wuxi Machine Tools Plant in 1996 is given.