Programming Of Integrated Product Development Process And Its Microcosmic Characteristics Analysis

Integrated product development (IPD) is an extension of concurrent engineering. It develops both product models and process models from the point of view of whole life cycle in order to meet the strategic targets of modern enterprises. The strategic targets on time, quality, cost, service and environment must face fierce competition from the manufacturing market. In fact, IPD is an optimal control process subjected to development constraints. Concurrency, cooperation and optimization are the essential features of IPD. Based on a microscopic analysis of the product development process, this dissertation documents a study of the theory and the methodology of IPD in the aspects of constrained programming, information feedback, and cooperative optimization.The constraint nets and the process nets were developed first. Based on the feedback-control theory, we then formulated the development process model subjected to the constraint nets. Several expanded models, including a constraint nets model, a process dynamic model, and a process coordination model, were established. A thorough description and a detailed analysis were provided on the constraint programming, logic relations, flow controls, state transitions, information-feedback mechanism, and the dynamic features of the product development process. The coordination among these processes was also elaborated. The design structure matrix of the dynamic model was established. Through an analysis of the dynamic model and its design structure matrix, the interdependence and feedback relationships among processes were optimized. The three steps of the control model of the product development process, which are process programming, process evaluation and process feedback, were established to speed up information flow. Physical programming, multi-objective optimization, and fuzzy evaluation were synthesized to optimize the product design process. Results show that microscopic process modeling is an important method for realizing life cycle design and optimizing the whole development process and product performance.A product's life cycle can be divided into a sequence of life phases. The status of the product evolves form one phase to another through these life phases. The state equations, the framework, and the integrated numeric model of the development process covering the entire life cycle were developed. The contents and the meanings of the mapping relationships between the physical domains and the functional domains in different design stages, such as the conceptual design, the detailed design, and the correctional design, were analyzed. According to the obtained results, the fuzzy mapping between the physical domains and the function domains in different design stages was established by integrating both objective and subjective information, such as specialist's knowledge, designer's preferences, and customer's requirements, in the design process. The characteristics of the structure behavior parameters were tabulated based on the fuzzy mapping relationships. The fuzzy mapping is very...