Study On Modeling, Simulation And Optimization Of The Product Designing Process

To develop in the fierce market competition of 21st century, enterprises have to design and manufacture product with highest quality and adaptability in shortest lean-time. With the change of environment, the increase of product's complexity and multiformity and adoption of the new model for product development, the process of product development becomes more complexity, to improve the quality of their product, now enterprises have established the model of product development process (PDP) to manage the system. To the questions which have faces during the process of modeling and problems of model of PDP, based on HTCPN, this dissertation establishes a new model of PDP and made a comprehensive study in the aspects of coordination, resource dispatch, version management and reusement.Based on the theory of task/process, a model of PDP was established on Hierarchical Colored Petri nets after a thoroughly analysis and research on PDP. Through the description and analysis on task, process and relationship between them, a concept of task/process was introduced into the system, from the decompositions of task/process level by level the structure of PDP was expressed detailedly. Matching the Places, Transitions, Colored sets and levels of Hierarchical Colored Petri nets to the corresponding elements of PDP system, the model of PDP with well structure and strong capability was structured.Coordination mechanisms based on Generalized Fuzzy Time Petri net was established to coordinate the conflicts in parallel and serial execution of system, and coordination component which all coordination mechanisms was encapsulated in also was proposed to manage the system with task component together. For the adoption of new mode for product development, there are a lot of problems during the execution of system such as, conflicts, waiting, even deadlock. Compared with Boolean Petri net, Generalized Fuzzy Time Petri net has strong capability and well structure. Based on GFTPN, different coordination mechanisms were established to different problems of system, and it was coordination component and task component that implement the function of management in the system model.Based on the research of manners of tasks execution and relationship between of task and documents, a document version manager was established to manage the version of documents in the system. As a resource and output information of product, document has important function in the system of product development, and version management of document becomes more crucial. Through a thorough analysis on parallel and serial version flow, interdependent between document and task was established and arithmetic about version management was proposed, version manager and task component complement the corresponding function in system.The concept of component was introduced from software engineering, architecture of system and management system of component library were established to reuse the used model of PDP. It is very efficient to improve the level of modeling that reuse and inherit the used model of PDP. Based on the analysis on model of PDP and levels of reuse, methods of construct system components, management components and structure components were proposed. The whole life cycle management of PDP model is implemented by management system of component library which manage the operations of components such as, deposit, take and search.