Automatic modification of part geometries subject to manufacturing constraints using fuzzy logic

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dc.contributor.authorBass, Henry Morganen
dc.contributor.committeechairBohn, Jan Helgeen
dc.contributor.committeememberMyklebust, Arviden
dc.contributor.committeememberMitchiner, Reginald G.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:47:08Zen
dc.date.adate2005-10-07en
dc.date.available2014-03-14T21:47:08Zen
dc.date.issued1996-05-04en
dc.date.rdate2005-10-07en
dc.date.sdate2005-10-07en
dc.description.abstractThere is frequently a need for algorithms capable of automatic modification of geometric models in response to manufacturing process constraints. Designers typically initiate product models using ideal, exact geometry; however, several non-traditional manufacturing processes frequently require slight modifications to the ideal model to accommodate various manufacturing process constraints. These modifications can be difficult, complex, and tedious to compute. For instance, metal-ceramic brazing requires adjustments to the part geometry primarily to accommodate thermal expansion and to allow for the insertion of a narrow braze-filler gap. These adjustments depend on the particular geometry, material properties, and processing parameters. Any modification to these product model parameters necessitates extensive recomputation to reestablish a manufacturable part geometry. This thesis demonstrates in part the integration of geometry into the overall product model by having the non-geometric parts of the product model provide feedback to the geometry by means of automatically modifying its shape. The methodology is demonstrated in a prototype model which introduces the concept of auxiliary geometric structures. In particular, the auxiliary geometric structures provide a mapping between the designer's intent and the part geometry described in the solid model. The designer's intent is represented in a rule base for metal-ceramic brazing that is controlled by fuzzy logic. This rule base aids the user in quantifying and generating from the auxiliary geometric structures the geometric modifications needed to conform with a complex set of rules derived from both analytic and empirical work in metal-ceramic brazingen
dc.description.degreeMaster of Scienceen
dc.format.extentviii, 282 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10072005-094854en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10072005-094854/en
dc.identifier.urihttp://hdl.handle.net/10919/45086en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1996.B378.pdfen
dc.relation.isformatofOCLC# 44462591en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectgeometric modificationsen
dc.subject.lccLD5655.V855 1996.B378en
dc.titleAutomatic modification of part geometries subject to manufacturing constraints using fuzzy logicen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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