Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes
A simple mathematical model was developed based on the single-degree-of-freedom analogy and principle of conservation of energy evaluating various modes of Vortex-Induced-Vibration (VIV) of a jack-up with cylindrical legs in steady flow. Mass ratio, damping ratio and mode factor were found to be the...
Ausführliche Beschreibung
Autor*in: |
Ramadasan, Sudheesh [verfasserIn] Tao, Longbin [verfasserIn] Dev, Arun Kr [verfasserIn] |
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Format: |
E-Artikel |
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Sprache: |
Englisch |
Erschienen: |
2019 |
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Schlagwörter: |
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Übergeordnetes Werk: |
Enthalten in: Marine structures - Amsterdam [u.a.] : Elsevier Science, 1988, 67 |
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Übergeordnetes Werk: |
volume:67 |
DOI / URN: |
10.1016/j.marstruc.2019.102637 |
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Katalog-ID: |
ELV002658682 |
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245 | 1 | 0 | |a Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes |
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520 | |a A simple mathematical model was developed based on the single-degree-of-freedom analogy and principle of conservation of energy evaluating various modes of Vortex-Induced-Vibration (VIV) of a jack-up with cylindrical legs in steady flow. Mass ratio, damping ratio and mode factor were found to be the important parameters controlling the inline and cross flow VIV and radius of gyration for the yaw VIV. Criteria for the initiation of the three VIV modes were developed for the cases of a single 2D cylinder, four rigidly coupled 2D cylinders in rectangular configuration and a jack-up experiencing uniform flow. The model tests demonstrated that the jack-up with cylindrical legs experienced cross flow and yaw VIV in uniform flows, with amplitude ratios greater than 0.1D. Further, there was considerable overlap of the lock-in ranges and coupling at higher current speeds of the aforementioned modes making the jack-up practically redundant throughout the operating currents. The analysis of the mean inline responses of the model revealed drag amplification due to the VIV. The test results validated the developed VIV model, VIV criteria and the importance of mass ratio in suppressing VIV. The mathematical method will enable practising engineers to consider the effect of VIV in jack-up designs. | ||
650 | 4 | |a Jack-up | |
650 | 4 | |a Vortex-induced-vibration (VIV) | |
650 | 4 | |a VIV criteria | |
650 | 4 | |a VIV suppression | |
700 | 1 | |a Tao, Longbin |e verfasserin |0 (orcid)0000-0002-8389-7209 |4 aut | |
700 | 1 | |a Dev, Arun Kr |e verfasserin |4 aut | |
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2019 |
allfields |
10.1016/j.marstruc.2019.102637 doi (DE-627)ELV002658682 (ELSEVIER)S0951-8339(18)30367-8 DE-627 ger DE-627 rda eng 380 DE-600 50.92 bkl 56.30 bkl Ramadasan, Sudheesh verfasserin aut Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A simple mathematical model was developed based on the single-degree-of-freedom analogy and principle of conservation of energy evaluating various modes of Vortex-Induced-Vibration (VIV) of a jack-up with cylindrical legs in steady flow. Mass ratio, damping ratio and mode factor were found to be the important parameters controlling the inline and cross flow VIV and radius of gyration for the yaw VIV. Criteria for the initiation of the three VIV modes were developed for the cases of a single 2D cylinder, four rigidly coupled 2D cylinders in rectangular configuration and a jack-up experiencing uniform flow. The model tests demonstrated that the jack-up with cylindrical legs experienced cross flow and yaw VIV in uniform flows, with amplitude ratios greater than 0.1D. Further, there was considerable overlap of the lock-in ranges and coupling at higher current speeds of the aforementioned modes making the jack-up practically redundant throughout the operating currents. The analysis of the mean inline responses of the model revealed drag amplification due to the VIV. The test results validated the developed VIV model, VIV criteria and the importance of mass ratio in suppressing VIV. The mathematical method will enable practising engineers to consider the effect of VIV in jack-up designs. Jack-up Vortex-induced-vibration (VIV) VIV criteria VIV suppression Tao, Longbin verfasserin (orcid)0000-0002-8389-7209 aut Dev, Arun Kr verfasserin aut Enthalten in Marine structures Amsterdam [u.a.] : Elsevier Science, 1988 67 Online-Ressource (DE-627)308449363 (DE-600)1502454-4 (DE-576)259484296 nnns volume:67 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 50.92 Meerestechnik 56.30 Wasserbau AR 67 |
spelling |
10.1016/j.marstruc.2019.102637 doi (DE-627)ELV002658682 (ELSEVIER)S0951-8339(18)30367-8 DE-627 ger DE-627 rda eng 380 DE-600 50.92 bkl 56.30 bkl Ramadasan, Sudheesh verfasserin aut Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A simple mathematical model was developed based on the single-degree-of-freedom analogy and principle of conservation of energy evaluating various modes of Vortex-Induced-Vibration (VIV) of a jack-up with cylindrical legs in steady flow. Mass ratio, damping ratio and mode factor were found to be the important parameters controlling the inline and cross flow VIV and radius of gyration for the yaw VIV. Criteria for the initiation of the three VIV modes were developed for the cases of a single 2D cylinder, four rigidly coupled 2D cylinders in rectangular configuration and a jack-up experiencing uniform flow. The model tests demonstrated that the jack-up with cylindrical legs experienced cross flow and yaw VIV in uniform flows, with amplitude ratios greater than 0.1D. Further, there was considerable overlap of the lock-in ranges and coupling at higher current speeds of the aforementioned modes making the jack-up practically redundant throughout the operating currents. The analysis of the mean inline responses of the model revealed drag amplification due to the VIV. The test results validated the developed VIV model, VIV criteria and the importance of mass ratio in suppressing VIV. The mathematical method will enable practising engineers to consider the effect of VIV in jack-up designs. Jack-up Vortex-induced-vibration (VIV) VIV criteria VIV suppression Tao, Longbin verfasserin (orcid)0000-0002-8389-7209 aut Dev, Arun Kr verfasserin aut Enthalten in Marine structures Amsterdam [u.a.] : Elsevier Science, 1988 67 Online-Ressource (DE-627)308449363 (DE-600)1502454-4 (DE-576)259484296 nnns volume:67 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 50.92 Meerestechnik 56.30 Wasserbau AR 67 |
allfields_unstemmed |
10.1016/j.marstruc.2019.102637 doi (DE-627)ELV002658682 (ELSEVIER)S0951-8339(18)30367-8 DE-627 ger DE-627 rda eng 380 DE-600 50.92 bkl 56.30 bkl Ramadasan, Sudheesh verfasserin aut Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A simple mathematical model was developed based on the single-degree-of-freedom analogy and principle of conservation of energy evaluating various modes of Vortex-Induced-Vibration (VIV) of a jack-up with cylindrical legs in steady flow. Mass ratio, damping ratio and mode factor were found to be the important parameters controlling the inline and cross flow VIV and radius of gyration for the yaw VIV. Criteria for the initiation of the three VIV modes were developed for the cases of a single 2D cylinder, four rigidly coupled 2D cylinders in rectangular configuration and a jack-up experiencing uniform flow. The model tests demonstrated that the jack-up with cylindrical legs experienced cross flow and yaw VIV in uniform flows, with amplitude ratios greater than 0.1D. Further, there was considerable overlap of the lock-in ranges and coupling at higher current speeds of the aforementioned modes making the jack-up practically redundant throughout the operating currents. The analysis of the mean inline responses of the model revealed drag amplification due to the VIV. The test results validated the developed VIV model, VIV criteria and the importance of mass ratio in suppressing VIV. The mathematical method will enable practising engineers to consider the effect of VIV in jack-up designs. Jack-up Vortex-induced-vibration (VIV) VIV criteria VIV suppression Tao, Longbin verfasserin (orcid)0000-0002-8389-7209 aut Dev, Arun Kr verfasserin aut Enthalten in Marine structures Amsterdam [u.a.] : Elsevier Science, 1988 67 Online-Ressource (DE-627)308449363 (DE-600)1502454-4 (DE-576)259484296 nnns volume:67 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 50.92 Meerestechnik 56.30 Wasserbau AR 67 |
allfieldsGer |
10.1016/j.marstruc.2019.102637 doi (DE-627)ELV002658682 (ELSEVIER)S0951-8339(18)30367-8 DE-627 ger DE-627 rda eng 380 DE-600 50.92 bkl 56.30 bkl Ramadasan, Sudheesh verfasserin aut Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A simple mathematical model was developed based on the single-degree-of-freedom analogy and principle of conservation of energy evaluating various modes of Vortex-Induced-Vibration (VIV) of a jack-up with cylindrical legs in steady flow. Mass ratio, damping ratio and mode factor were found to be the important parameters controlling the inline and cross flow VIV and radius of gyration for the yaw VIV. Criteria for the initiation of the three VIV modes were developed for the cases of a single 2D cylinder, four rigidly coupled 2D cylinders in rectangular configuration and a jack-up experiencing uniform flow. The model tests demonstrated that the jack-up with cylindrical legs experienced cross flow and yaw VIV in uniform flows, with amplitude ratios greater than 0.1D. Further, there was considerable overlap of the lock-in ranges and coupling at higher current speeds of the aforementioned modes making the jack-up practically redundant throughout the operating currents. The analysis of the mean inline responses of the model revealed drag amplification due to the VIV. The test results validated the developed VIV model, VIV criteria and the importance of mass ratio in suppressing VIV. The mathematical method will enable practising engineers to consider the effect of VIV in jack-up designs. Jack-up Vortex-induced-vibration (VIV) VIV criteria VIV suppression Tao, Longbin verfasserin (orcid)0000-0002-8389-7209 aut Dev, Arun Kr verfasserin aut Enthalten in Marine structures Amsterdam [u.a.] : Elsevier Science, 1988 67 Online-Ressource (DE-627)308449363 (DE-600)1502454-4 (DE-576)259484296 nnns volume:67 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 50.92 Meerestechnik 56.30 Wasserbau AR 67 |
allfieldsSound |
10.1016/j.marstruc.2019.102637 doi (DE-627)ELV002658682 (ELSEVIER)S0951-8339(18)30367-8 DE-627 ger DE-627 rda eng 380 DE-600 50.92 bkl 56.30 bkl Ramadasan, Sudheesh verfasserin aut Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A simple mathematical model was developed based on the single-degree-of-freedom analogy and principle of conservation of energy evaluating various modes of Vortex-Induced-Vibration (VIV) of a jack-up with cylindrical legs in steady flow. Mass ratio, damping ratio and mode factor were found to be the important parameters controlling the inline and cross flow VIV and radius of gyration for the yaw VIV. Criteria for the initiation of the three VIV modes were developed for the cases of a single 2D cylinder, four rigidly coupled 2D cylinders in rectangular configuration and a jack-up experiencing uniform flow. The model tests demonstrated that the jack-up with cylindrical legs experienced cross flow and yaw VIV in uniform flows, with amplitude ratios greater than 0.1D. Further, there was considerable overlap of the lock-in ranges and coupling at higher current speeds of the aforementioned modes making the jack-up practically redundant throughout the operating currents. The analysis of the mean inline responses of the model revealed drag amplification due to the VIV. The test results validated the developed VIV model, VIV criteria and the importance of mass ratio in suppressing VIV. The mathematical method will enable practising engineers to consider the effect of VIV in jack-up designs. Jack-up Vortex-induced-vibration (VIV) VIV criteria VIV suppression Tao, Longbin verfasserin (orcid)0000-0002-8389-7209 aut Dev, Arun Kr verfasserin aut Enthalten in Marine structures Amsterdam [u.a.] : Elsevier Science, 1988 67 Online-Ressource (DE-627)308449363 (DE-600)1502454-4 (DE-576)259484296 nnns volume:67 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 50.92 Meerestechnik 56.30 Wasserbau AR 67 |
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Ramadasan, Sudheesh |
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Ramadasan, Sudheesh ddc 380 bkl 50.92 bkl 56.30 misc Jack-up misc Vortex-induced-vibration (VIV) misc VIV criteria misc VIV suppression Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes |
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380 DE-600 50.92 bkl 56.30 bkl Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes Jack-up Vortex-induced-vibration (VIV) VIV criteria VIV suppression |
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ddc 380 bkl 50.92 bkl 56.30 misc Jack-up misc Vortex-induced-vibration (VIV) misc VIV criteria misc VIV suppression |
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ddc 380 bkl 50.92 bkl 56.30 misc Jack-up misc Vortex-induced-vibration (VIV) misc VIV criteria misc VIV suppression |
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ddc 380 bkl 50.92 bkl 56.30 misc Jack-up misc Vortex-induced-vibration (VIV) misc VIV criteria misc VIV suppression |
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Elektronische Aufsätze Aufsätze Elektronische Ressource |
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Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes |
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Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes |
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Ramadasan, Sudheesh |
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Ramadasan, Sudheesh Tao, Longbin Dev, Arun Kr |
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Ramadasan, Sudheesh |
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vortex-induced-vibration of jack-ups with cylindrical legs in multiple modes |
title_auth |
Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes |
abstract |
A simple mathematical model was developed based on the single-degree-of-freedom analogy and principle of conservation of energy evaluating various modes of Vortex-Induced-Vibration (VIV) of a jack-up with cylindrical legs in steady flow. Mass ratio, damping ratio and mode factor were found to be the important parameters controlling the inline and cross flow VIV and radius of gyration for the yaw VIV. Criteria for the initiation of the three VIV modes were developed for the cases of a single 2D cylinder, four rigidly coupled 2D cylinders in rectangular configuration and a jack-up experiencing uniform flow. The model tests demonstrated that the jack-up with cylindrical legs experienced cross flow and yaw VIV in uniform flows, with amplitude ratios greater than 0.1D. Further, there was considerable overlap of the lock-in ranges and coupling at higher current speeds of the aforementioned modes making the jack-up practically redundant throughout the operating currents. The analysis of the mean inline responses of the model revealed drag amplification due to the VIV. The test results validated the developed VIV model, VIV criteria and the importance of mass ratio in suppressing VIV. The mathematical method will enable practising engineers to consider the effect of VIV in jack-up designs. |
abstractGer |
A simple mathematical model was developed based on the single-degree-of-freedom analogy and principle of conservation of energy evaluating various modes of Vortex-Induced-Vibration (VIV) of a jack-up with cylindrical legs in steady flow. Mass ratio, damping ratio and mode factor were found to be the important parameters controlling the inline and cross flow VIV and radius of gyration for the yaw VIV. Criteria for the initiation of the three VIV modes were developed for the cases of a single 2D cylinder, four rigidly coupled 2D cylinders in rectangular configuration and a jack-up experiencing uniform flow. The model tests demonstrated that the jack-up with cylindrical legs experienced cross flow and yaw VIV in uniform flows, with amplitude ratios greater than 0.1D. Further, there was considerable overlap of the lock-in ranges and coupling at higher current speeds of the aforementioned modes making the jack-up practically redundant throughout the operating currents. The analysis of the mean inline responses of the model revealed drag amplification due to the VIV. The test results validated the developed VIV model, VIV criteria and the importance of mass ratio in suppressing VIV. The mathematical method will enable practising engineers to consider the effect of VIV in jack-up designs. |
abstract_unstemmed |
A simple mathematical model was developed based on the single-degree-of-freedom analogy and principle of conservation of energy evaluating various modes of Vortex-Induced-Vibration (VIV) of a jack-up with cylindrical legs in steady flow. Mass ratio, damping ratio and mode factor were found to be the important parameters controlling the inline and cross flow VIV and radius of gyration for the yaw VIV. Criteria for the initiation of the three VIV modes were developed for the cases of a single 2D cylinder, four rigidly coupled 2D cylinders in rectangular configuration and a jack-up experiencing uniform flow. The model tests demonstrated that the jack-up with cylindrical legs experienced cross flow and yaw VIV in uniform flows, with amplitude ratios greater than 0.1D. Further, there was considerable overlap of the lock-in ranges and coupling at higher current speeds of the aforementioned modes making the jack-up practically redundant throughout the operating currents. The analysis of the mean inline responses of the model revealed drag amplification due to the VIV. The test results validated the developed VIV model, VIV criteria and the importance of mass ratio in suppressing VIV. The mathematical method will enable practising engineers to consider the effect of VIV in jack-up designs. |
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title_short |
Vortex-Induced-Vibration of jack-ups with cylindrical legs in multiple modes |
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