Type of Document Dissertation Author Scott, Karen Mary Louise Author's Email Address email@example.com URN etd-06292011-104123 Title Practical Analysis Tools for Structures Subjected to Flow-Induced and Non-Stationary Random Loads Degree PhD Department Aerospace and Ocean Engineering Advisory Committee
Advisor Name Title Kapania, Rakesh K. Committee Chair Patil, Mayuresh J. Committee Member Philen, Michael K. Committee Member Schetz, Joseph A. Committee Member Keywords
- Flow-induced vibration
- random vibration
- non-stationary forcing
- Karhunen-Loeve expansion
- polynomial chaos
Date of Defense 2011-06-20 Availability restricted AbstractThere is a need to investigate and improve upon existing methods to predict response of sensors due to flow-induced vibrations in a pipe flow. The aim was to develop a tool which would enable an engineer to quickly evaluate the suitability of a particular design for a certain pipe flow application, without sacrificing fidelity. The primary methods, found in guides published by the American Society of Mechanical Engineers (ASME), of simple response prediction of sensors were found to be lacking in several key areas, which prompted development of the tool described herein. A particular limitation of the existing guidelines deals with complex stochastic stationary and non-stationary modeling and required much further study, therefore providing direction for the second portion of this body of work.
A tool for response prediction of fluid-induced vibrations of sensors was developed which allowed for analysis of low aspect ratio sensors. Results from the tool were compared to experimental lift and drag data, recorded for a range of flow velocities. The model was found to perform well over the majority of the velocity range showing superiority in prediction of response as compared to ASME guidelines. The tool was then applied to a design problem given by an industrial partner, showing several of their designs to be inadequate for the proposed flow regime. This immediate identification of unsuitable designs no doubt saved significant time in the product development process.
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