Vortex-induced vibration of slender structures in unsteady flow
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2002.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2005
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| Online Access: | http://hdl.handle.net/1721.1/8331 |
| _version_ | 1811096191103926272 |
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| author | Liao, Jung-Chi, 1971- |
| author2 | J. Kim Vandiver. |
| author_facet | J. Kim Vandiver. Liao, Jung-Chi, 1971- |
| author_sort | Liao, Jung-Chi, 1971- |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2002. |
| first_indexed | 2024-09-23T16:40:00Z |
| format | Thesis |
| id | mit-1721.1/8331 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T16:40:00Z |
| publishDate | 2005 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/83312019-04-13T00:08:25Z Vortex-induced vibration of slender structures in unsteady flow VIV of slender structures in unsteady flow Liao, Jung-Chi, 1971- J. Kim Vandiver. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Mechanical Engineering. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, February 2002. Includes bibliographical references (p. 164-165). Vortex-induced vibration (VIV) results in fatigue damage of offshore oil exploration and production structures. In recent years, the offshore industry has begun to employ curved slender structures such as steel catenary risers in deep-water offshore oil systems. The top-end vessel motion causes the slender riser to oscillate, creating an unsteady and nonuniform flow profile along the riser. The purpose of this research is to develop a VIV prediction model for slender structures under top-end periodic motions. The key approach to this problem requires identifying the dimensionless parameters important to the unsteady VIV. A set of data from a large-scale model test for highly compliant risers conducted by industry is available. The spectral analysis of the data showed a periodic pattern of the response frequencies. A constant Strouhal (St) number model was proposed such that shedding frequencies change with local inline velocities. The Keulegan-Carpenter number (KC) controls the number of vortex pairs shed per cycle. A KC threshold larger than 40 was found to have significant response for a long structure with finite length excitation region. An approximate solution to the response of an infinite beam with a finite excitation length was obtained; this solution provided an explanation for the high KC threshold. A model for an equivalent reduced damping Sg under a non-uniform, unsteady flow was proposed. This equivalent reduced damping Sg was used to establish a prediction model for the VIV under top-end periodic motions. A time domain simulation of unsteady VIV was demonstrated by using Green's functions. (cont.) The turning point problem wave propagation was solved for a pipe resting on a linearly varying stiffness foundation. Simple rules were established for conservative estimation of TDP fatigue damage with soil interactions. Guidelines for model test experiment design were provided based on dimensional analysis and scaling rules. by Jung-Chi Liao. Ph.D. 2005-08-23T19:15:05Z 2005-08-23T19:15:05Z 2001 2002 Thesis http://hdl.handle.net/1721.1/8331 50499550 eng M.I.T. 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. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 165 p. 9883864 bytes 9883624 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Mechanical Engineering. Liao, Jung-Chi, 1971- Vortex-induced vibration of slender structures in unsteady flow |
| title | Vortex-induced vibration of slender structures in unsteady flow |
| title_full | Vortex-induced vibration of slender structures in unsteady flow |
| title_fullStr | Vortex-induced vibration of slender structures in unsteady flow |
| title_full_unstemmed | Vortex-induced vibration of slender structures in unsteady flow |
| title_short | Vortex-induced vibration of slender structures in unsteady flow |
| title_sort | vortex induced vibration of slender structures in unsteady flow |
| topic | Mechanical Engineering. |
| url | http://hdl.handle.net/1721.1/8331 |
| work_keys_str_mv | AT liaojungchi1971 vortexinducedvibrationofslenderstructuresinunsteadyflow AT liaojungchi1971 vivofslenderstructuresinunsteadyflow |