Research On Information Theory And Integration Methods Of Information-based Manufacturing

The rapid change of market demand and the global economic integration have greatly widened the range of manufacturing activity. A product's value structure, production cost and response speed are more and more dependent upon manufacturing information and knowledge. Information is becoming a dominating factor to constrain modern manufacturing system. It has brought a new demand for manufacturing science. Taking the information in the manufacturing activity as the main clue, the dissertation tried to center the discussion on the Information-based Manufacturing combined with the research of national nature science fund project and "863"high-technology plan project. The dissertation takes the Information-based Manufacturing as the center; architecture of Information-based Manufacturing, theory of manufacturing information and information integration as its basic points; and mass customization information and enterprise application system integration in the Information-based Manufacturing as the supporting points. The model and architecture of Information-based Manufacturing are systematically put forward against the background of informatization for the manufacturing industry. The meaning, character, fundamental theory and key technologies of information are studied. The organization form and constitution of Information-based Manufacturing are given. The six characteristic factors and the inherence dynamic mechanisms led by self-organization of Information-based Manufacturing system are analyzed in the dissertation. The definition, character, types and intensity of information are researched. The manufacturing information is classified. The influence of information quality upon decision-making has been evaluated from sensitivity, value sensitivity and precision of information. The fundamental methods and engineering application of bayes's theorem are discussed, the maximum entropy principle for the choice regulation of prior distribution is analyzed. The bayesian estimation of parameters is gained by means of the method of conjugate distribution. The property and application of Beta distribution function are researched. System structure of the integration criterion of manufacturing information are given with base of analysis of several main methods of information integration. Information integration methods based XML and Enterprise Application Integration(EAI) are studied. The key technology and realizing means of information integration & process integration for CAPP/PDM/ERP are researched according to integration mode of EAI confirmed by infrastructure of information-based manufacturing system. Mass customization is a typical production mode of information-based manufact -uring. The manage of individuality information and information-share between prod-uction enterprises will be the key factor for mass customization. From the evolution of manufacturing mode, the change of enterprise management stratagem is reviewed in the dissertation. The concept of mass customization information is given. The content and methods of mass customization information are discussed. The concept of "center of vicegerent service for enterprise information"is introduced in the Information-based Manufacturing system, and an overall architecture of open EAI based upon hierarchical structure and supporting information integration and process integration of various applied systems in enterprise is presented.The key technologies and the implementation methods of information integration and process integration between some application systems based on EAI are discussed in detail.The information integration of CAPP/PDM and PDM/ERP is realized with a scheme of compact integration based on CORBA and XML and a scheme of incompact integration based on Web Services and private UDDI. The process integration of CAPP/PDM/ERP is also realized through modeling the overall process in the Enterprise Application Portal and Managing respectively in some local processes. Finally, the research contents and conclusions of this dissertation have been summarized and its further studies are forecast.