An object oriented representation for mechanical design based on constraints Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/w37639418

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  • A representation for the process of mechanical design, along with its computer implementation is presented and discussed. The representation consists of three fundamental concepts: design objects, constraints, and decisions. The design objects are the structures with which the physical artifacts of the design are described. A design object consists of a set of attributes that represent the properties and characteristics of that object. The values of these attributes are specified by the constraints of the design. The constraints specify the values of and relations between the attributes of the design object. The conglomeration of design objects and their respective constraints define the state of the design. The state of the design can be thought of as a snapshot of the design taken at any particular time in the design process. Changes to this state occur through the introduction of new constraints into the design space. New constraints are brought into the design by the application of a design decision. The design decision process consists of a set of input constraints, an evaluation performed on those input constraints and the subsequent generation of one or more new resulting constraints. These new constraints in turn affect the attribute values and relations of the design objects, thereby changing the state of the design. This representation is capable of storing not only the final state of a design, but the initial and intermediate states as well. Maintained also, is the process of change from one design state to the next. By using this representation, one can inspect the evolution of design objects, the propagation and dependencies of the constraints, and the rationale behind the decisions of the design. This representation was developed from data extracted from mechanical design protocols. These protocols were of mechanical designers solving original design problems and consisted of video recordings, verbal transcripts, and the designer's original drawings. The representation was implemented in HyperClass, an object oriented programming environment. The implementation is capable of generating and displaying graphical images of the design. The design information extracted from the protocols can be recorded by the implementation developed.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-03-21T19:52:11Z (GMT) No. of bitstreams: 1 McGinnisBrianD1991.pdf: 8444256 bytes, checksum: 42691cf23178a63d81d64837be3f941c (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-03-21T20:04:46Z (GMT) No. of bitstreams: 1 McGinnisBrianD1991.pdf: 8444256 bytes, checksum: 42691cf23178a63d81d64837be3f941c (MD5)
  • description.provenance : Submitted by Kaylee Patterson (kdpscanner@gmail.com) on 2013-03-20T19:06:25Z No. of bitstreams: 1 McGinnisBrianD1991.pdf: 8444256 bytes, checksum: 42691cf23178a63d81d64837be3f941c (MD5)
  • description.provenance : Made available in DSpace on 2013-03-21T20:04:46Z (GMT). No. of bitstreams: 1 McGinnisBrianD1991.pdf: 8444256 bytes, checksum: 42691cf23178a63d81d64837be3f941c (MD5) Previous issue date: 1990-06-07

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