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Analysis and Optimum Design of stiffened shear webs in airframes
Dissertation (MEng (Mechanical and Aeronautical Engineering))--University of Pretoria, 2006.
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| Format: | Thesis |
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University of Pretoria
2013
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| _version_ | 1867613710907867136 |
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| access_status_str | Open Access |
| author2 | Visser, A.G. |
| author_browse | Visser, A.G. |
| author_facet | Visser, A.G. |
| collection | Thesis |
| dc_rights_str_mv | © 2004, 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 (Mechanical and Aeronautical Engineering))--University of Pretoria, 2006. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/23127 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:40:28.830Z |
| 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:2263/23127 Analysis and Optimum Design of stiffened shear webs in airframes Visser, A.G. Groenwold, Albert A. upetd@up.ac.za Viljoen, Awie Genetic algorithm Structural optimization Fortran program Shear web Aircraft structures Non-linear finite element analysis Naca Diagonal tension Grisham algorithm Post-buckling analysis UCTD Dissertation (MEng (Mechanical and Aeronautical Engineering))--University of Pretoria, 2006. The analysis and optimum design of stiffened, shear webs in aircraft structures is addressed. The post-buckling behaviour of the webs is assessed using the interactive algorithm developed by Grisham. This method requires only linear finite element analyses, while convergence is typically achieved in as few as five iterations. The Grisham algorithm is extensively compared with empirical analysis methods previously used for aircraft structures and also with a refined, non-linear quasi-static finite element analysis. The Grisham algorithm provides for both compressive buckling in two directions as well as shear buckling, and overcomes some of the conservatism inherent in conventional methods of analysis. In addition, the method is notably less expensive than a complete non-linear finite element analysis, even though global collapse cannot be predicted. While verification of the analysis methodology is the main focus of the stud, an initial investigation into optimization is also made. In optimizing stiffened thin walled structures, the Grisham algorithm is combined with a genetic algorithm. Allowable stress constraints are accommodated using a simple penalty formulation. Mechanical and Aeronautical Engineering unrestricted 2013-09-06T14:38:36Z 2005-01-13 2013-09-06T14:38:36Z 2004-03-03 2006-01-13 2005-01-13 Dissertation Viljoen, A 2004, Analysis and Optimum Design of stiffened shear webs in airframes, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/23127 > http://hdl.handle.net/2263/23127 http://upetd.up.ac.za/thesis/available/etd-01132005-132131/ © 2004, 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 application/pdf application/pdf application/pdf University of Pretoria |
| spellingShingle | Genetic algorithm Structural optimization Fortran program Shear web Aircraft structures Non-linear finite element analysis Naca Diagonal tension Grisham algorithm Post-buckling analysis UCTD Analysis and Optimum Design of stiffened shear webs in airframes |
| title | Analysis and Optimum Design of stiffened shear webs in airframes |
| title_full | Analysis and Optimum Design of stiffened shear webs in airframes |
| title_fullStr | Analysis and Optimum Design of stiffened shear webs in airframes |
| title_full_unstemmed | Analysis and Optimum Design of stiffened shear webs in airframes |
| title_short | Analysis and Optimum Design of stiffened shear webs in airframes |
| title_sort | analysis and optimum design of stiffened shear webs in airframes |
| topic | Genetic algorithm Structural optimization Fortran program Shear web Aircraft structures Non-linear finite element analysis Naca Diagonal tension Grisham algorithm Post-buckling analysis UCTD |
| url | http://hdl.handle.net/2263/23127 http://upetd.up.ac.za/thesis/available/etd-01132005-132131/ |