Study Of Integrated Information System For Geometrical Tolerances In The New-generation GPS Based On Category Theory

In order to reduce the uncertainty within the process of design, manufacture and metrology, and to harmonize with the informatization of manufacturing industry and digitization of standards and metrology, many new concepts have been employed in the new-generation Geometrical Product Specifications and Verification (Abbreviated as new-generation GPS). However, these concepts are based on rigorous mathematics and, at the same time, intricately related, which make them inconvenient to be used directly. Consequently, it is of practical meaning to build an integrated information system to encapsulate the knowledge in the new-generation GPS, which will ultimately extend the application of the new-generation GPS in manufacturing.In order to meet the requirements of development and the practical application of new-generation GPS standards system, the Integrated Information System for Geometrical Toleances in the new-generation Geometrical Product Specifications (Abbrivated as IisGPS) has been established. The main researches and creative points are as follows:The overall framework for the IisGPS was proposed and devised; and a two-layer model for geometrical specifications information was proposed, which can can strengthen the concision for the drawing indication of geometrical specifications based on its complete design, besides, it also can remedy the limitation of ISO 1101:2004.According to the characteristics of geometrical specifications information, the categorical data modeling method had been introduced to its data modelling. Through detailed analysis of the complete verification operators for geometrical tolerances, the categorical data models for them were established. The model implements the two-layer model for geometrical specifications information and the concurrent design concept.Different categories of knowledge rules were established for the IisGPS, such as the rules for the application of geometrical requirement, tolerance type, datum and datum reference framework and, for the refinement among geometrical specifications, etc. The establishment of these rules will strengthen the rationality and intellegence of IisGPS.A general estimation model and the management procedure for compliance uncertainty were proposed, which can strengthen the rationality of the decision rules for the conformance of a product. The case study proves that it is very necessary to establish the IisGPS.A host system for drawing indication for geometrical specifications was established based on the new-generation GPS. This host system was developed on AutoCAD 2007 using ObjectARX.