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dc.contributor.advisorGu, Peihua
dc.contributor.authorLi, Yadong
dc.date.accessioned2005-08-16T17:09:21Z
dc.date.available2005-08-16T17:09:21Z
dc.date.issued2004
dc.identifier.citationLi, Y. (2004). Feature-based inspection and comparison of parts with free-form surfaces (Unpublished doctoral thesis). University of Calgary, Calgary, AB. doi:10.11575/PRISM/12594en_US
dc.identifier.isbn0612978656en
dc.identifier.urihttp://hdl.handle.net/1880/41725
dc.descriptionBibliography: p. 185-204en
dc.descriptionSome pages are in colour.en
dc.description.abstractIn this research, a feature-based automatic localization and comparison method for free-form surface inspection is proposed. This method firstly defines and extracts necessary surface features from the measurement surface and the design model, and then localizes these two surfaces through two steps: the general and fine localizations. The general localization is a feature-based process that establishes the correspondence between measurement surface and design model based on the corresponding features of these two surfaces, and transforms the measurement surface to the design coordinate system. To establish the correspondence efficiently, a method called best-three-points is proposed, which selects only three pairs of the most similar features and uses them to decide the general corresponding relationship. In many inspections, it is very often that only portion of the surface requires inspections. For this case, a solution has been proposed to determine the correspondence by evaluating the geometric and topological information of the measurement data and design model. The fine localization focuses on the point to point correspondence and localizes the surfaces in such a way that the comparison can be made. The identification of the corresponding point in fine localization is carried out by searching a limited range of the neighbouring area of the result from general localization. This makes this process faster and more stable. Some techniques such as Subdivide-Grid and local range searching have been proposed to improve the robustness and stability of this process. For many engineering applications, the free-form surface is assigned profile tolerance with reference to design datums due to the consideration of assembly, functionality and other manufacturing requirements. The DDF (datum direction frame) approach has been proposed to solve this problem. The free-form surfaces studied m this research can have arbitrary positions and orientations in 3D space. The measurement data can be obtained by using either contact measuring facilities such as coordinate measuring machines (CMM) or through noncontact measurements such as laser scanners. Implementations and experiments have been carried out for verifying the overall methodologies.
dc.format.extentxvi, 204 leaves : ill. ; 30 cm.en
dc.language.isoeng
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.titleFeature-based inspection and comparison of parts with free-form surfaces
dc.typedoctoral thesis
dc.publisher.institutionUniversity of Calgaryen
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/12594
thesis.degree.nameDoctor of Philosophy
thesis.degree.namePhD
thesis.degree.disciplineMechanical and Manufacturing Engineering
thesis.degree.grantorUniversity of Calgary
dc.identifier.lccAC1 .T484 2004 L51en
dc.publisher.placeCalgaryen
ucalgary.thesis.notesUARCen
ucalgary.thesis.uarcreleaseyen
ucalgary.item.requestcopytrue
ucalgary.thesis.accessionTheses Collection 58.002:Box 1517 520492034


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University of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.