The Development And Exploration Of A Surface Texture Specification And Verification Information System Based On The Philosophy Of Next Generation GPS

Surface texture, which is generated by most common machining processes, plays a significant role in determining the function performance of workpiece, in particular in high precision engineering and mechanical applications concerning tribology. The designing and controlling of surface texture are always one of the most important determinants of product functions. Based on metrology and uncertainty philosophy, the next generation GPS standards system oriented the digitizing design, manufacturing and verification. Under the pressure of digital design requirements, the standards system provides the theory and methods for digital manufacturing. The knowledge about surface texture in GPS system includes massive diverse concepts and semantic structures which cover specification definitions, definition categories, semantic understanding, algebraic structures, structured entities, attributes and relationships between all of them. The diversification of the knowledge makes it difficult to be utilized in computing science. A functional approach that completely expresses the complicated surface texture knowledge for designers and engineers is often nonexistent in the floor. Using category data model, this dissertation discussed the development and exploration of the profile, areal surface texture specifications and verification information system based on the philosophy of the next generation GPS. The main researches and creative points are as follows:This dissertation presents the utilization of category theory to model sophisticated knowledge in the filed of profile and areal surface texture. Based on characteristics of category theory, it can use categories to express all of the different kinds of structures in surface texture, and objects and arrows in a category to describe different elements in structures and relationships between elements respectively. Category theory ignores the unnecessary details of different definitions and structures, and focuses on the categories and relationships between and in them. The functions of pullbacks, arrows and functors were considered to be inference mechanism.Based on category theory model, the specification and verification processes for profile and areal surface texture were developed. All of the complex relationship between different elements in specifications and verification for profile and areal surface texture can be constructed by category model, therefore, providing the designers a complete and unambiguous profile and areal surface texture specification platform and the metrologists a mapped detailed verification tool.The overall framework for the surface texture information system of the next generation GPS system and integrate method with CAx system were proposed and devised. Several development tools involving XML, COM, C++ and C# were applied to resolve the integration problem. The functions and framework for five major model of the information system were designed.A prototype system for the surface texture information system was established. The software platform of the system was integrated with AutoCAD 2010, development tools adopted involve ObjectARX, Visual C++, COM, XML, Visual C# etc. Two engineering examples were studied to demonstrate the effectiveness of this system.