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The exploration of a category theory-based virtual Geometrical product specification system for design and manufacturing

Xu, Yuanping (2009) The exploration of a category theory-based virtual Geometrical product specification system for design and manufacturing. Doctoral thesis, University of Huddersfield.

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    Abstract

    In order to ensure quality of products and to facilitate global outsourcing, almost all
    the so-called “world-class” manufacturing companies nowadays are applying various
    tools and methods to maintain the consistency of a product’s characteristics
    throughout its manufacturing life cycle. Among these, for ensuring the consistency of
    the geometric characteristics, a tolerancing language − the Geometrical Product
    Specification (GPS) has been widely adopted to precisely transform the functional
    requirements from customers into manufactured workpieces expressed as tolerance
    notes in technical drawings. Although commonly acknowledged by industrial users as
    one of the most successful efforts in integrating existing manufacturing life-cycle
    standards, current GPS implementations and software packages suffer from several
    drawbacks in their practical use, possibly the most significant, the difficulties in
    inferring the data for the “best” solutions. The problem stemmed from the foundation
    of data structures and knowledge-based system design. This indicates that there need
    to be a “new” software system to facilitate GPS applications.
    The presented thesis introduced an innovative knowledge-based system − the
    VirtualGPS − that provides an integrated GPS knowledge platform based on a stable
    and efficient database structure with knowledge generation and accessing facilities.
    The system focuses on solving the intrinsic product design and production problems
    by acting as a virtual domain expert through translating GPS standards and rules into
    the forms of computerized expert advices and warnings. Furthermore, this system can
    be used as a training tool for young and new engineers to understand the huge amount
    of GPS standards in a relative “quicker” manner.
    The thesis started with a detailed discussion of the proposed categorical modelling
    mechanism, which has been devised based on the Category Theory. It provided a
    unified mechanism for knowledge acquisition and representation, knowledge-based
    system design, and database schema modelling. As a core part for assessing this
    knowledge-based system, the implementation of the categorical Database
    Management System (DBMS) is also presented in this thesis. The focus then moved
    on to demonstrate the design and implementation of the proposed VirtualGPS system.
    The tests and evaluations of this system were illustrated in Chapter 6. Finally, the
    thesis summarized the contributions to knowledge in Chapter 7.
    After thoroughly reviewing the project, the conclusions reached construe that the
    III
    entire VirtualGPS system was designed and implemented to conform to Category
    Theory and object-oriented programming rules. The initial tests and performance
    analyses show that the system facilitates the geometric product manufacturing
    operations and benefits the manufacturers and engineers alike from function designs,
    to a manufacturing and verification.

    Item Type: Thesis (Doctoral)
    Subjects: T Technology > T Technology (General)
    T Technology > TJ Mechanical engineering and machinery
    Schools: School of Computing and Engineering
    Depositing User: Pat Whitworth
    Date Deposited: 10 Nov 2009 11:14
    Last Modified: 01 Mar 2011 01:38
    URI: http://eprints.hud.ac.uk/id/eprint/6135

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