Multi-mode flow-induced vibrations of two side-by-side slender flexible cylinders in a uniform flow
Flow-induced vibration (FIV) of multiple marine risers frequently occurs in deepwater applications and might result in serious structural failure due to fatigue damage accumulation. It is known that long marine risers may experience high modes of vibration and behave multi-mode vibration features. M...
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| Veröffentlicht in: | Marine structures 2018-01, Vol.57, p.219-236 |
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| creator | Xu, Wanhai Cheng, Ankang Ma, Yexuan Gao, Xifeng |
| description | Flow-induced vibration (FIV) of multiple marine risers frequently occurs in deepwater applications and might result in serious structural failure due to fatigue damage accumulation. It is known that long marine risers may experience high modes of vibration and behave multi-mode vibration features. Moreover, the interactions of multiple risers subject to FIV are very complex and still unclear. In this paper, a series of experimental tests were carried out to investigate FIV of two side-by-side flexible cylinders with high aspect ratio (length to diameter, L/D = 350) in a towing tank. Four cases of different spacing ratios (center-to-center separation distances to cylinder diameter, S/D = 3.0, 4.0, 6.0 and 8.0) were adopted to examine the effect of spacing on the multi-mode FIV of the two flexible cylinders. The maximum dominant modes are 4th and 6th in cross-flow (CF) and in-line (IL) directions for both side-by-side cylinders, as well as the single one. In the switching region of the adjacent modes of vibration, higher-order mode vibrations are less difficult to excite for side-by-side cylinders. The IL displacement amplitudes of the two cylinders could be enhanced by the remarkably strong interaction between cylinders, even with a center-to-center distance of up to 8.0 cylinder diameter. In addition, the IL FIV behaviors are much more complicated than those in CF direction, for instance the response spectra in IL direction exhibit several large peaks and lots of small spikes around. The IL and CF interactions of the two side-by-side flexible cylinders were also investigated by using the response trajectories collected from seven measurement points at different reduced velocities.
•Experiment of the multi-mode FIV of two side-by-side flexible cylinders are conducted in a towing water tank.•The apparent proximity interference exists in CF direction when the spacing is smaller 6.0D.•The two cylinders still have remarkably strong interaction in IL direction as the spacing ratio S/D = 8.0. |
| doi_str_mv | 10.1016/j.marstruc.2017.10.009 |
| format | Article |
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•Experiment of the multi-mode FIV of two side-by-side flexible cylinders are conducted in a towing water tank.•The apparent proximity interference exists in CF direction when the spacing is smaller 6.0D.•The two cylinders still have remarkably strong interaction in IL direction as the spacing ratio S/D = 8.0.</description><identifier>ISSN: 0951-8339</identifier><identifier>EISSN: 1873-4170</identifier><identifier>DOI: 10.1016/j.marstruc.2017.10.009</identifier><language>eng</language><publisher>Barking: Elsevier Ltd</publisher><subject>Crack propagation ; Cross flow ; Cylinders ; Damage accumulation ; Deep water ; Direction ; Fatigue failure ; Flexible cylinder ; Flow generated vibrations ; Flow-induced vibration ; High aspect ratio ; Interactions ; Marine riser ; Modes ; Ratios ; Riser pipes ; Risers ; Side-by-side arrangement ; Spacing ratio ; Strong interactions (field theory) ; Structural damage ; Structural failure ; Studies ; Switching ; Towing ; Towing tanks ; Trajectory measurement ; Uniform flow ; Vibration ; Vibration mode ; Vibrations</subject><ispartof>Marine structures, 2018-01, Vol.57, p.219-236</ispartof><rights>2017 Elsevier Ltd</rights><rights>Copyright Elsevier BV Jan 2018</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c388t-3a33e0452cf5c463c49d93db9602b3cdcc282c10ff28911807cae92d8612f6c73</citedby><cites>FETCH-LOGICAL-c388t-3a33e0452cf5c463c49d93db9602b3cdcc282c10ff28911807cae92d8612f6c73</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.marstruc.2017.10.009$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3548,27923,27924,45994</link.rule.ids></links><search><creatorcontrib>Xu, Wanhai</creatorcontrib><creatorcontrib>Cheng, Ankang</creatorcontrib><creatorcontrib>Ma, Yexuan</creatorcontrib><creatorcontrib>Gao, Xifeng</creatorcontrib><title>Multi-mode flow-induced vibrations of two side-by-side slender flexible cylinders in a uniform flow</title><title>Marine structures</title><description>Flow-induced vibration (FIV) of multiple marine risers frequently occurs in deepwater applications and might result in serious structural failure due to fatigue damage accumulation. It is known that long marine risers may experience high modes of vibration and behave multi-mode vibration features. Moreover, the interactions of multiple risers subject to FIV are very complex and still unclear. In this paper, a series of experimental tests were carried out to investigate FIV of two side-by-side flexible cylinders with high aspect ratio (length to diameter, L/D = 350) in a towing tank. Four cases of different spacing ratios (center-to-center separation distances to cylinder diameter, S/D = 3.0, 4.0, 6.0 and 8.0) were adopted to examine the effect of spacing on the multi-mode FIV of the two flexible cylinders. The maximum dominant modes are 4th and 6th in cross-flow (CF) and in-line (IL) directions for both side-by-side cylinders, as well as the single one. In the switching region of the adjacent modes of vibration, higher-order mode vibrations are less difficult to excite for side-by-side cylinders. The IL displacement amplitudes of the two cylinders could be enhanced by the remarkably strong interaction between cylinders, even with a center-to-center distance of up to 8.0 cylinder diameter. In addition, the IL FIV behaviors are much more complicated than those in CF direction, for instance the response spectra in IL direction exhibit several large peaks and lots of small spikes around. The IL and CF interactions of the two side-by-side flexible cylinders were also investigated by using the response trajectories collected from seven measurement points at different reduced velocities.
•Experiment of the multi-mode FIV of two side-by-side flexible cylinders are conducted in a towing water tank.•The apparent proximity interference exists in CF direction when the spacing is smaller 6.0D.•The two cylinders still have remarkably strong interaction in IL direction as the spacing ratio S/D = 8.0.</description><subject>Crack propagation</subject><subject>Cross flow</subject><subject>Cylinders</subject><subject>Damage accumulation</subject><subject>Deep water</subject><subject>Direction</subject><subject>Fatigue failure</subject><subject>Flexible cylinder</subject><subject>Flow generated vibrations</subject><subject>Flow-induced vibration</subject><subject>High aspect ratio</subject><subject>Interactions</subject><subject>Marine riser</subject><subject>Modes</subject><subject>Ratios</subject><subject>Riser pipes</subject><subject>Risers</subject><subject>Side-by-side arrangement</subject><subject>Spacing ratio</subject><subject>Strong interactions (field theory)</subject><subject>Structural damage</subject><subject>Structural failure</subject><subject>Studies</subject><subject>Switching</subject><subject>Towing</subject><subject>Towing tanks</subject><subject>Trajectory measurement</subject><subject>Uniform flow</subject><subject>Vibration</subject><subject>Vibration mode</subject><subject>Vibrations</subject><issn>0951-8339</issn><issn>1873-4170</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqFkE9LAzEUxIMoWKtfQQKeU_M27W5yU4r_oOJFz2H3JYGU7aYmu6399matnj0NDDPzeD9CroHPgEN5u55t6pj6OOCs4FBlc8a5OiETkJVgc6j4KZlwtQAmhVDn5CKlNc9BAJgQfB3a3rNNMJa6NuyZ78yA1tCdb2Ld-9AlGhzt94EmbyxrDmxUmlrbGRtzx375prUUD60fnUR9R2s6dN6FuPnZvCRnrm6TvfrVKfl4fHhfPrPV29PL8n7FUEjZM1ELYfl8UaBb4LwUOFdGCdOokheNQINYyAKBO1dIBSB5hbVVhZElFK7ESkzJzXF3G8PnYFOv12GIXT6pQUngQqpS5lR5TGEMKUXr9Db6TPCggesRqF7rP6B6BDr6GWgu3h2LNv-w8zbqhN52GZaPFnttgv9v4huLUoN2</recordid><startdate>201801</startdate><enddate>201801</enddate><creator>Xu, Wanhai</creator><creator>Cheng, Ankang</creator><creator>Ma, Yexuan</creator><creator>Gao, Xifeng</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>7TB</scope><scope>7TN</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>KR7</scope><scope>SOI</scope></search><sort><creationdate>201801</creationdate><title>Multi-mode flow-induced vibrations of two side-by-side slender flexible cylinders in a uniform flow</title><author>Xu, Wanhai ; Cheng, Ankang ; Ma, Yexuan ; Gao, Xifeng</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c388t-3a33e0452cf5c463c49d93db9602b3cdcc282c10ff28911807cae92d8612f6c73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Crack propagation</topic><topic>Cross flow</topic><topic>Cylinders</topic><topic>Damage accumulation</topic><topic>Deep water</topic><topic>Direction</topic><topic>Fatigue failure</topic><topic>Flexible cylinder</topic><topic>Flow generated vibrations</topic><topic>Flow-induced vibration</topic><topic>High aspect ratio</topic><topic>Interactions</topic><topic>Marine riser</topic><topic>Modes</topic><topic>Ratios</topic><topic>Riser pipes</topic><topic>Risers</topic><topic>Side-by-side arrangement</topic><topic>Spacing ratio</topic><topic>Strong interactions (field theory)</topic><topic>Structural damage</topic><topic>Structural failure</topic><topic>Studies</topic><topic>Switching</topic><topic>Towing</topic><topic>Towing tanks</topic><topic>Trajectory measurement</topic><topic>Uniform flow</topic><topic>Vibration</topic><topic>Vibration mode</topic><topic>Vibrations</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Xu, Wanhai</creatorcontrib><creatorcontrib>Cheng, Ankang</creatorcontrib><creatorcontrib>Ma, Yexuan</creatorcontrib><creatorcontrib>Gao, Xifeng</creatorcontrib><collection>CrossRef</collection><collection>Environment Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Environment Abstracts</collection><jtitle>Marine structures</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Xu, Wanhai</au><au>Cheng, Ankang</au><au>Ma, Yexuan</au><au>Gao, Xifeng</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Multi-mode flow-induced vibrations of two side-by-side slender flexible cylinders in a uniform flow</atitle><jtitle>Marine structures</jtitle><date>2018-01</date><risdate>2018</risdate><volume>57</volume><spage>219</spage><epage>236</epage><pages>219-236</pages><issn>0951-8339</issn><eissn>1873-4170</eissn><abstract>Flow-induced vibration (FIV) of multiple marine risers frequently occurs in deepwater applications and might result in serious structural failure due to fatigue damage accumulation. It is known that long marine risers may experience high modes of vibration and behave multi-mode vibration features. Moreover, the interactions of multiple risers subject to FIV are very complex and still unclear. In this paper, a series of experimental tests were carried out to investigate FIV of two side-by-side flexible cylinders with high aspect ratio (length to diameter, L/D = 350) in a towing tank. Four cases of different spacing ratios (center-to-center separation distances to cylinder diameter, S/D = 3.0, 4.0, 6.0 and 8.0) were adopted to examine the effect of spacing on the multi-mode FIV of the two flexible cylinders. The maximum dominant modes are 4th and 6th in cross-flow (CF) and in-line (IL) directions for both side-by-side cylinders, as well as the single one. In the switching region of the adjacent modes of vibration, higher-order mode vibrations are less difficult to excite for side-by-side cylinders. The IL displacement amplitudes of the two cylinders could be enhanced by the remarkably strong interaction between cylinders, even with a center-to-center distance of up to 8.0 cylinder diameter. In addition, the IL FIV behaviors are much more complicated than those in CF direction, for instance the response spectra in IL direction exhibit several large peaks and lots of small spikes around. The IL and CF interactions of the two side-by-side flexible cylinders were also investigated by using the response trajectories collected from seven measurement points at different reduced velocities.
•Experiment of the multi-mode FIV of two side-by-side flexible cylinders are conducted in a towing water tank.•The apparent proximity interference exists in CF direction when the spacing is smaller 6.0D.•The two cylinders still have remarkably strong interaction in IL direction as the spacing ratio S/D = 8.0.</abstract><cop>Barking</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.marstruc.2017.10.009</doi><tpages>18</tpages><oa>free_for_read</oa></addata></record> |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Crack propagation Cross flow Cylinders Damage accumulation Deep water Direction Fatigue failure Flexible cylinder Flow generated vibrations Flow-induced vibration High aspect ratio Interactions Marine riser Modes Ratios Riser pipes Risers Side-by-side arrangement Spacing ratio Strong interactions (field theory) Structural damage Structural failure Studies Switching Towing Towing tanks Trajectory measurement Uniform flow Vibration Vibration mode Vibrations |
| title | Multi-mode flow-induced vibrations of two side-by-side slender flexible cylinders in a uniform flow |
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