Multiple objective optimization of an airfoil shape

dc.contributor.advisorKok, Schalken
dc.contributor.emailantoine.dymond@up.ac.zaen
dc.contributor.postgraduateDymond, Antoine Smith Drydenen
dc.date.accessioned2013-09-06T14:02:27Z
dc.date.available2011-05-10en
dc.date.available2013-09-06T14:02:27Z
dc.date.created2011-02-15en
dc.date.issued2011en
dc.date.submitted2011-03-02en
dc.descriptionDissertation (MEng)--University of Pretoria, 2011.en
dc.description.abstractAn 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.availabilityunrestricteden
dc.description.departmentMechanical and Aeronautical Engineeringen
dc.identifier.citationDymond, 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.otherC11/70/agen
dc.identifier.upetdurlhttp://upetd.up.ac.za/thesis/available/etd-03022011-163939/en
dc.identifier.urihttp://hdl.handle.net/2263/22939
dc.language.isoen
dc.publisherUniversity of Pretoriaen_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.subjectReal-world optimizationen
dc.subjectMulti-objective optimizationen
dc.subjectUndefined regionsen
dc.subjectUCTDen_US
dc.titleMultiple objective optimization of an airfoil shapeen
dc.typeDissertationen

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