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Mitigation of Vortex-Induced Vibrations in Cables Using Macro-Fiber Composites

Title: Mitigation of Vortex-Induced Vibrations in Cables Using Macro-Fiber Composites.
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Name(s): Munoz, Gustavo J., author
Jung, Sungmoon, professor directing thesis
Rambo-Roddenberry, Michelle, committee member
Spainhour, Lisa K., committee member
Department of Civil and Environmental Engineering, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2012
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Vortex-Induced Vibration (VIV) in cables is a prevalent phenomenon affecting the structural health of bridges and their components. Past studies have shown both passive and active methods are beneficial in the reduction of vibrations, however, a number of issues such as excessive base moment, transformation of geometry, intrusive implementation and fatigue limit the effectiveness of current engineering. A method involving no intrusion, no geometrical manipulation and a mechanism to prevent and mitigate VIV is needed. A "skin" of material embedded with Macro-Fiber Composite (MFC) material and with the capabilities of perturbing the surface near the separation point of vortex shedding is explored and tested. Simplifications of the proposed material are made in order to understand the effects of the capabilities of a perturbing skin of MFC material. Construction of a 17-ft Open-circuit wind tunnel is done in order to make the VIV condition to be tested with the near method of VIV control. The VIV on cables is recorded. Experiments are run inside the tunnel at a Re of 11400 and 6400. In order to see the effects of surface perturbations, an MFC actuation mechanism is made and a cable section effectively able to cause surface perturbations is built. A test is then run to find the effect of different angles of perturbation. Finally, a testing and analysis of a phase-difference of a signal, at prescribed perturbation frequencies is done. This is analyzed against surface vortex formation theory. The data are analyzed in order to see the capabilities of an MFC skin on VIV of cables. The mechanism shows promise in both reducing VIV and providing for a low-key, non-intrusive control mechanism.
Identifier: FSU_migr_etd-5058 (IID)
Submitted Note: A Thesis submitted to the Department of Civil and Environmental Engineering in partial fulfillment of the requirements for the degree of Master of Science.
Degree Awarded: Spring Semester, 2012.
Date of Defense: March 30, 2012.
Keywords: Control, Frequency, Response, Structural Health, Vibration, Vortex
Bibliography Note: Includes bibliographical references.
Advisory Committee: Sungmoon Jung, Professor Directing Thesis; Michelle Rambo-Roddenberry, Committee Member; Lisa K. Spainhour, Committee Member.
Subject(s): Civil engineering
Environmental engineering
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5058
Owner Institution: FSU

Choose the citation style.
Munoz, G. J. (2012). Mitigation of Vortex-Induced Vibrations in Cables Using Macro-Fiber Composites. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-5058