EXPERIMENTAL INVESTIGATION OF THIN-WALLED CYLINDRICAL CANTILEVER BEAMS UNDERGOING VORTEX-INDUCED VIBRATIONS

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dc.contributor.advisorGedikli, Ersegun Deniz
dc.contributor.authorEncke, Clara Vanessa
dc.contributor.departmentOcean & Resources Engineering
dc.date.accessioned2024-07-02T23:41:55Z
dc.date.available2024-07-02T23:41:55Z
dc.date.issued2024
dc.description.degreeM.S.
dc.identifier.urihttps://hdl.handle.net/10125/108348
dc.subjectOcean engineering
dc.subjectCantilever Cylinder
dc.subjectFluid Body Interaction
dc.subjectLow-Damping Ratio
dc.subjectLow-Mass Ratio
dc.subjectOcean Structures
dc.subjectVortex-Induced Vibrations
dc.titleEXPERIMENTAL INVESTIGATION OF THIN-WALLED CYLINDRICAL CANTILEVER BEAMS UNDERGOING VORTEX-INDUCED VIBRATIONS
dc.typeThesis
dcterms.abstractThe main objective of this Master’s thesis is to present the execution and results of an experimental study on the dynamic response of three low-mass ratio cylindrical cantilever beams experiencing vortex-induced vibrations. The tested cylinders are hollow, sealed, and made out of polycarbonate with low mass ratios m* of 0.761, 0.830, and 0.922 and damping ratios between 0.037, 0.051, and 0.045. The motion is being analyzed by using high-speed cameras to document the motion under UV lights for better image quality. ProAnalyst software is being used to translate the videos into motion-tracking data in two directions In-Line (IL) and Cross-Flow (CF). Our findings indicate that the IL: CF frequency ratios conform to the conventional 2:1 frequency ratio. Nonetheless, we also observed 1:1 and 3:1 frequency ratios at low and high reduced velocities, accompanied by predominantly small positive and negative lift coefficients in phase with velocity values. The amplitude response aligns with previous literature, although our study shows that the in-line amplitudes reach higher values due to the cylinders’ low mass and damping ratios. Specifically, at reduced velocities below 3, one of the cylinders experienced higher in-line amplitudes than cross-flow.
dcterms.extent90 pages
dcterms.languageen
dcterms.publisherUniversity of Hawai'i at Manoa
dcterms.rightsAll UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
dcterms.typeText
local.identifier.alturihttp://dissertations.umi.com/hawii:12164

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M.S. - Ocean and Resources Engineering