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Selective feature preserved elastic surface registration in complex geometric morphology
Dissertation (MEng)--University of Pretoria, 2011.
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| Format: | Thesis |
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University of Pretoria
2013
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| _version_ | 1867613528344494080 |
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| access_status_str | Open Access |
| author2 | Kok, Schalk |
| author_browse | Kok, Schalk |
| author_facet | Kok, Schalk |
| collection | Thesis |
| dc_rights_str_mv | © 2011, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng)--University of Pretoria, 2011. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/28136 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:37:34.848Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/28136 Selective feature preserved elastic surface registration in complex geometric morphology Kok, Schalk Wilke, Daniel Nicolas jacojvrensburg@gmail.com Jansen van Rensburg, G.J. (Gerhardus Jacobus) Selective feature Elastic surface Complex geometric morphology UCTD Dissertation (MEng)--University of Pretoria, 2011. Deforming a complex generic shape into a representation of another complex shape is investigated. An initial study is done on the effect of cranial shape variation on masticatory induced stress. A finite element analysis is performed on two different skull geometries. One skull geometry has a prognathic shape, characterised by jaws protruding forward, while the other has a non-prognathic form. Comparing the results of the initial nite element analyses, the effect of an undesired variation in shape and topology on the resulting stress field is observed. This variation in shape and topology can not be attributed to the cranial shape variation that is investigated. This means that the variation in the masticatory induced stress field that is due to the relative degree in prognathism can not be quantified effectively. To best compare results, it would be beneficial to have a computational domain for the different skull geometries that have one-to-one correspondence. An approach to obtain a computational domain that represents various geometries with the exact same mesh size and connectivity between them does exist. This approach involves deforming a generic mesh to represent different target shapes. This report covers an introductory study to register and deform a generic mesh to approximately represent a complex target geometry. Various procedures are investigated, implemented and combined to specifically accommodate complex geometries like that of the human skull. A surface registration procedure is implemented and combined with a feature registration procedure. Feature lines are extracted from the surface representation of each skull as well as the generic shape. These features are compared and an initial deformation is applied to the generic shape to better represent the corresponding features on the target. Selective feature preserved elastic surface registration is performed after the initial feature based registration. Only the registration to surfaces of featureless areas and matched feature areas are allowed along with user selected areas during surface registration. The implemented procedures have various aspects that still require improvement before the desired study regarding prognathism's effect on masticatory induced stress could truly be approached pragmatically. Focus is only given to the use of existing procedures while the additional required improvements could be addressed in future work. It is however required that the resulting discretised domain obtained in this initial study be of sufficient quality to be used in a finite element analysis (FEA). The implemented procedure is illustrated using the two original skull geometries. Symmetric versions of these geometries are generated with a one-to-one correspondence map between them. The skull representations are then used in a finite element analysis to illustrate the appeal of having computational domains with a consistent mapping between them. The variation in the masticatory induced stress field due to the variation in cranial shape is illustrated using the consistent mapping between the geometries as part of this example. Mechanical and Aeronautical Engineering unrestricted 2013-09-07T12:56:33Z 2011-10-18 2013-09-07T12:56:33Z 2011-09-06 2011-10-18 2011-09-22 Dissertation Jansen van Rensburg, GJ 2011, Selective feature preserved elastic surface registration in complex geometric morphology, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/28136 > E11/9/125/gm http://hdl.handle.net/2263/28136 http://upetd.up.ac.za/thesis/available/etd-09222011-131310/ © 2011, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf University of Pretoria |
| spellingShingle | Selective feature Elastic surface Complex geometric morphology UCTD Selective feature preserved elastic surface registration in complex geometric morphology |
| title | Selective feature preserved elastic surface registration in complex geometric morphology |
| title_full | Selective feature preserved elastic surface registration in complex geometric morphology |
| title_fullStr | Selective feature preserved elastic surface registration in complex geometric morphology |
| title_full_unstemmed | Selective feature preserved elastic surface registration in complex geometric morphology |
| title_short | Selective feature preserved elastic surface registration in complex geometric morphology |
| title_sort | selective feature preserved elastic surface registration in complex geometric morphology |
| topic | Selective feature Elastic surface Complex geometric morphology UCTD |
| url | http://hdl.handle.net/2263/28136 http://upetd.up.ac.za/thesis/available/etd-09222011-131310/ |