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dc.contributor.authorSmith, Shane
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.date2008-09-05 10:51:26.273en
dc.date.accessioned2008-09-05T19:10:47Z
dc.date.available2008-09-05T19:10:47Z
dc.date.issued2008-09-05T19:10:47Z
dc.identifier.urihttp://hdl.handle.net/1974/1410
dc.descriptionThesis (Master, Mechanical and Materials Engineering) -- Queen's University, 2008-09-05 10:51:26.273en
dc.description.abstractA practical engineering design problem is used to examine the over-conservativeness of designs obtained using deterministic optimization with worst-case parameter assumptions and a safety factor. Additionally, an attempted application of reliability-based design optimization (RBDO) demonstrates the limits of RBDO for practical problems. The design problem considered here is TESCO's Internal Casing Drive System (ICDS), which is used in feeding pipeline, or casing, into predrilled holes. After developing a finite element model of the ICDS, experimental data is used to successfully validate modeling methods and assumptions. The validated model is then subjected to multiple analyses to determine an appropriate design configuration to be used as the starting point for optimization. Worst-case, safety factor-based design optimization (SFBDO) is then applied considering two and three design variables, and is successful in increasing the critical load of the ICDS, Pcrit, by 35% and 45%, respectively. An efficient and recognized RBDO method, Sequential Optimization and Reliability Assessment, is selected for application to the design problem to determine an optimum design based on reliability. Due to the optimization formulation, however, SORA cannot be applied. The ICDS design problem represents a practical example that demonstrates the difficulties and limits in applying RBDO to practical engineering design problems. To evaluate the over-conservativeness of worst-case SFBDO, structural reliability analysis is performed on the deterministic optimum designs. It is found that the value of Pcrit for both the two and three variable optimum designs can be increased by 53% while maintaining acceptable probability of failure, demonstrating the over-conservativeness of the worst-case SFBDO.en
dc.format.extent4482620 bytes
dc.format.mimetypeapplication/pdf
dc.languageenen
dc.language.isoenen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectoptimization, RBDO, structural reliability, safety factor, FEAen
dc.titleReliability of Deterministic Optimization and Limits of RBDO in Application to a Practical Design Problemen
dc.typeThesisen
dc.description.degreeMasteren
dc.contributor.supervisorKim, Il-Yongen
dc.contributor.departmentMechanical and Materials Engineeringen


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