Multiple objective optimization of an airfoil shape

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dc.contributor.advisor Kok, Schalk en
dc.contributor.postgraduate Dymond, Antoine Smith Dryden en
dc.date.accessioned 2013-09-06T14:02:27Z
dc.date.available 2011-05-10 en
dc.date.available 2013-09-06T14:02:27Z
dc.date.created 2011-02-15 en
dc.date.issued 2011-05-10 en
dc.date.submitted 2011-03-02 en
dc.description Dissertation (MEng)--University of Pretoria, 2011. en
dc.description.abstract An airfoil shape optimization problem with conflicting objectives is handled using two different multi-objective approaches. These are an a priori scalarization approach where the conflicting objectives are assigned weights and summed together to form a single objective, and the Pareto-optimal multi-objective approach. The optimization formulations for both approaches contain challenging numerical characteristics which include noise, multi-modality and undefined regions. Gradient-, surrogate- and population-based single objective optimization methods are applied to the `a priori' formulations. The gradient methods are modified to improve their performance on noisy problems as well as to handle undefined regions in the design space. The modifications are successful but the modified methods are outperformed by the surrogate methods and population based methods. Population-based techniques are used for the Pareto-optimal multi-objective approach. Two established optimization algorithms and two custom algorithms are implemented. The custom algorithms use fitted unrotated hyper ellipses and linear aggregating functions to search the design space for non-dominated designs. Various multi-objective formulations are posed to investigate different aspects of the airfoil design problem. The non-dominated designs found by the Pareto-optimal multi-objective optimization algorithms are then presented. en
dc.description.availability unrestricted en
dc.description.department Mechanical and Aeronautical Engineering en
dc.identifier.citation Dymond, ASD 2011, Multiple objective optimization of an airfoil shape, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/22939 > en
dc.identifier.other C11/70/ag en
dc.identifier.upetdurl http://upetd.up.ac.za/thesis/available/etd-03022011-163939/ en
dc.identifier.uri http://hdl.handle.net/2263/22939
dc.language.iso en
dc.publisher University of Pretoria en_ZA
dc.rights © 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. en
dc.subject Real-world optimization en
dc.subject Multi-objective optimization en
dc.subject Undefined regions en
dc.subject UCTD en_US
dc.title Multiple objective optimization of an airfoil shape en
dc.type Dissertation en


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