| The product design process and product information model gradually become the core of product design and manufacturing with the application of computer technology, with dynamic changeable product design environment, information technology and design methodology in manufacturing. Currently, the high demand product design problems of integration, consistency and completeness can be solved discretely by product modeling technique in dispersing and single domain method which can not form the deign flow of the through product life cycle. And it will also cause lots of issues such as randomness of information flow, discreteness of information and model, imperfectness of product model expression, no center integration and no consistent expression. In allusion to these, it is necessary to definite unified and describe the product information included in all stages of the product total life cycle. And the Product information modeling theory and realisation technique of complete information expression, high integrated level and good consistency can be established which can provide entirety, accuracy and efficient information supporting for product digital design.From the standpoint of information science and design methodology, the design method of the complete design process was proposed and Multi-layer and multi-body product information modeling theory facing the complete design process was researched. Also the Level characteristics and the system structure of Multi-layer and multi-body product information modeling were constructed. From the standpoint of information behavior, the entropy model of design behavior was established by applying dissipative structure, and entropy theory and the order degree evaluation methodology of digital design systems facing design behavior was constructed.(1)Based on the analysis of product design process integration phase and the product design process evolution, the concept of complete design process was proposed. Also the coupled relation and interaction mechanisms of information, process and behavior were researched and the space model of the basic elements was constructed. The mechanism of the complete design process was analyzed and the process model was constructed. In addition, the connotation of product information in the complete design process was elaborated and the express and realization method of IUI was improved, which provides theory guidance for realizing product information modeling methods based on information consistency, integration and completeness. (2)The theory of multilayer-multibody modeling for product information orient to the complete design process is researched,the concept of multilayer-multibody model for product information are put forward, The model should play a key role of carrier role of information-bearing, bridge of information integration and vector effect of information following. The Complete expression, fully integrated and unanimous disposal of product information can be realized by multilayer-multibody model.(3)Based on the theory of multilayer-multibody modeling for product information, the integrated structure system of basic body, retrieval body and control body were built. The geometric topology structure of the base body was constructed by the geometric modeling platform OpenCASCADE. By applying new attribute mechanism and dynamic isomorphic tree on the basis of tree frame structure, the mapping relation between geometric topology information of product models and non-geometric topology information IUI was established, the multi-level expression of product information was formed, and the follow mechanism of information and model was studied. The structure system of control body and was constructed, the function of integrated external resources is researched,it introducts the design process and controls interaction between the model and theinformation by Multi-level trigger model, is established.(4)The software system design framework of supporting multilayer-multibody for product information modeling was researched. A case study on the design process of the Car door, the Door Design Modeling System was developed. As the design of the front door inner plate and inner plate draw dies for example, the Multi-layer and multi-body product information model and the practical applicability of the door design modeling system were tested.(5)Based on the theories of design methodology and information behavior, and in allusion to the characteristic of the design behavior of digital environment, the design behavior’s concept on the basis of complete design process was proposed. With the introduction of dissipative structure and information entropy theory, the entropy structure and dissipative structure of product digital design system were researched. By using the degree of order as the measurement method of product digital design system, the design behavior entropy model of product digital design system was established and the specific evaluation system of product digital design system was set up by applying aging entropy and quality entropy. |
