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Setpoint Chasing for Thruster-Assisted Position Mooring
In the present industrial thruster-assisted position mooring (PM) systems, thrusters are used to damp the vessel's dynamical motions and to provide compensation of any line breakage. To increase robustness and extend the weather window for PM systems, this paper proposes a new concept of setpoi...
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Published in: | IEEE journal of oceanic engineering 2009-10, Vol.34 (4), p.548-558 |
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description | In the present industrial thruster-assisted position mooring (PM) systems, thrusters are used to damp the vessel's dynamical motions and to provide compensation of any line breakage. To increase robustness and extend the weather window for PM systems, this paper proposes a new concept of setpoint (SP) chasing for moderate and extreme conditions. The SP in moderate conditions is the vessel's equilibrium position where the environmental loads are balanced by the mooring forces to avoid the conflict between the control action of thruster assistance and the mooring system. To chase this SP, the thruster assistance provides additional damping and restoring forces to compensate the dynamic environmental loads while the mooring system compensates the mean environmental loads. The simulations and experiments suggested that the proposed SP chasing for moderate conditions improved the vessel performance while the utilization of the mooring system was maximized. Due to risk for mooring line breakage, the SP in extreme conditions is the position closer to the field zero point than the equilibrium position. To chase this SP, the thruster assistance provides damping, restoring force and mean force controls to compensate both the dynamic and a part of the mean environmental loads while the mooring system compensates the rest of the mean environmental loads. The simulations indicated that the proposed SP chasing for extreme conditions reduced the vessel's drift and tension in the most loaded line. |
doi_str_mv | 10.1109/JOE.2009.2034553 |
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To increase robustness and extend the weather window for PM systems, this paper proposes a new concept of setpoint (SP) chasing for moderate and extreme conditions. The SP in moderate conditions is the vessel's equilibrium position where the environmental loads are balanced by the mooring forces to avoid the conflict between the control action of thruster assistance and the mooring system. To chase this SP, the thruster assistance provides additional damping and restoring forces to compensate the dynamic environmental loads while the mooring system compensates the mean environmental loads. The simulations and experiments suggested that the proposed SP chasing for moderate conditions improved the vessel performance while the utilization of the mooring system was maximized. Due to risk for mooring line breakage, the SP in extreme conditions is the position closer to the field zero point than the equilibrium position. To chase this SP, the thruster assistance provides damping, restoring force and mean force controls to compensate both the dynamic and a part of the mean environmental loads while the mooring system compensates the rest of the mean environmental loads. The simulations indicated that the proposed SP chasing for extreme conditions reduced the vessel's drift and tension in the most loaded line.</description><identifier>ISSN: 0364-9059</identifier><identifier>EISSN: 1558-1691</identifier><identifier>DOI: 10.1109/JOE.2009.2034553</identifier><identifier>CODEN: IJOEDY</identifier><language>eng</language><publisher>New York: IEEE</publisher><subject>Cables ; Control systems ; Cybernetics ; Damping ; Damping force ; Dynamical systems ; Dynamics ; Force control ; Frequency ; line breakage ; Loads (forces) ; Marine ; Marine technology ; Marine vehicles ; mean force ; Mooring ; Oceans ; Offshore oil wells ; restoring force ; setpoint (SP) chasing ; Simulation ; thruster-assisted position mooring (PM) ; Thrusters ; Vectors ; Vessels</subject><ispartof>IEEE journal of oceanic engineering, 2009-10, Vol.34 (4), p.548-558</ispartof><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2009</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c417t-c3d23f5d7964870ec627932b51d63c2dade24d0442b37b52ff4048ed150fb7153</citedby><cites>FETCH-LOGICAL-c417t-c3d23f5d7964870ec627932b51d63c2dade24d0442b37b52ff4048ed150fb7153</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/5308756$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>314,780,784,27923,27924,54795</link.rule.ids></links><search><creatorcontrib>Nguyen, D.T.</creatorcontrib><creatorcontrib>Sorensen, A.J.</creatorcontrib><title>Setpoint Chasing for Thruster-Assisted Position Mooring</title><title>IEEE journal of oceanic engineering</title><addtitle>JOE</addtitle><description>In the present industrial thruster-assisted position mooring (PM) systems, thrusters are used to damp the vessel's dynamical motions and to provide compensation of any line breakage. To increase robustness and extend the weather window for PM systems, this paper proposes a new concept of setpoint (SP) chasing for moderate and extreme conditions. The SP in moderate conditions is the vessel's equilibrium position where the environmental loads are balanced by the mooring forces to avoid the conflict between the control action of thruster assistance and the mooring system. To chase this SP, the thruster assistance provides additional damping and restoring forces to compensate the dynamic environmental loads while the mooring system compensates the mean environmental loads. The simulations and experiments suggested that the proposed SP chasing for moderate conditions improved the vessel performance while the utilization of the mooring system was maximized. Due to risk for mooring line breakage, the SP in extreme conditions is the position closer to the field zero point than the equilibrium position. To chase this SP, the thruster assistance provides damping, restoring force and mean force controls to compensate both the dynamic and a part of the mean environmental loads while the mooring system compensates the rest of the mean environmental loads. The simulations indicated that the proposed SP chasing for extreme conditions reduced the vessel's drift and tension in the most loaded line.</description><subject>Cables</subject><subject>Control systems</subject><subject>Cybernetics</subject><subject>Damping</subject><subject>Damping force</subject><subject>Dynamical systems</subject><subject>Dynamics</subject><subject>Force control</subject><subject>Frequency</subject><subject>line breakage</subject><subject>Loads (forces)</subject><subject>Marine</subject><subject>Marine technology</subject><subject>Marine vehicles</subject><subject>mean force</subject><subject>Mooring</subject><subject>Oceans</subject><subject>Offshore oil wells</subject><subject>restoring force</subject><subject>setpoint (SP) chasing</subject><subject>Simulation</subject><subject>thruster-assisted position mooring (PM)</subject><subject>Thrusters</subject><subject>Vectors</subject><subject>Vessels</subject><issn>0364-9059</issn><issn>1558-1691</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNqN0T1PwzAQBmALgUQp7EgsEQOwpPjjbMdjVZUvFRWJMltp7FBXbVzsZODf46oVA0PF4vPw3Ol0L0KXBA8Iwer-ZToeUIxVehhwzo5Qj3Be5EQocox6mAnIFebqFJ3FuMSYAEjVQ_LdthvvmjYbLcroms-s9iGbLUIXWxvyYYwufUz25qNrnW-yV-9DYufopC5X0V7sax99PIxno6d8Mn18Hg0neQVEtnnFDGU1N1IJKCS2laBSMTrnxAhWUVMaS8FgADpncs5pXQOGwhrCcT2XhLM-ut3N3QT_1dnY6rWLlV2tysb6LupCSMmUEiTJm4OSEiooKPkfyIHRLbw7CIlIGwqazp3o9R-69F1o0mV0wSWwJCEhvENV8DEGW-tNcOsyfGuC9TZEnULU2xD1PsTUcrVrcdbaX84ZLiQX7AcP05Uk</recordid><startdate>20091001</startdate><enddate>20091001</enddate><creator>Nguyen, D.T.</creator><creator>Sorensen, A.J.</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. (IEEE)</general><scope>97E</scope><scope>RIA</scope><scope>RIE</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SC</scope><scope>7SP</scope><scope>7TB</scope><scope>7TN</scope><scope>8FD</scope><scope>F1W</scope><scope>FR3</scope><scope>H96</scope><scope>JQ2</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>L~C</scope><scope>L~D</scope><scope>F28</scope></search><sort><creationdate>20091001</creationdate><title>Setpoint Chasing for Thruster-Assisted Position Mooring</title><author>Nguyen, D.T. ; Sorensen, A.J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c417t-c3d23f5d7964870ec627932b51d63c2dade24d0442b37b52ff4048ed150fb7153</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Cables</topic><topic>Control systems</topic><topic>Cybernetics</topic><topic>Damping</topic><topic>Damping force</topic><topic>Dynamical systems</topic><topic>Dynamics</topic><topic>Force control</topic><topic>Frequency</topic><topic>line breakage</topic><topic>Loads (forces)</topic><topic>Marine</topic><topic>Marine technology</topic><topic>Marine vehicles</topic><topic>mean force</topic><topic>Mooring</topic><topic>Oceans</topic><topic>Offshore oil wells</topic><topic>restoring force</topic><topic>setpoint (SP) chasing</topic><topic>Simulation</topic><topic>thruster-assisted position mooring (PM)</topic><topic>Thrusters</topic><topic>Vectors</topic><topic>Vessels</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Nguyen, D.T.</creatorcontrib><creatorcontrib>Sorensen, A.J.</creatorcontrib><collection>IEEE All-Society Periodicals Package (ASPP) 2005-present</collection><collection>IEEE All-Society Periodicals Package (ASPP) 1998-Present</collection><collection>IEEE Electronic Library (IEL)</collection><collection>CrossRef</collection><collection>Computer and Information Systems Abstracts</collection><collection>Electronics & Communications Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Technology Research Database</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>ProQuest Computer Science Collection</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Computer and Information Systems Abstracts – Academic</collection><collection>Computer and Information Systems Abstracts Professional</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><jtitle>IEEE journal of oceanic engineering</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Nguyen, D.T.</au><au>Sorensen, A.J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Setpoint Chasing for Thruster-Assisted Position Mooring</atitle><jtitle>IEEE journal of oceanic engineering</jtitle><stitle>JOE</stitle><date>2009-10-01</date><risdate>2009</risdate><volume>34</volume><issue>4</issue><spage>548</spage><epage>558</epage><pages>548-558</pages><issn>0364-9059</issn><eissn>1558-1691</eissn><coden>IJOEDY</coden><abstract>In the present industrial thruster-assisted position mooring (PM) systems, thrusters are used to damp the vessel's dynamical motions and to provide compensation of any line breakage. To increase robustness and extend the weather window for PM systems, this paper proposes a new concept of setpoint (SP) chasing for moderate and extreme conditions. The SP in moderate conditions is the vessel's equilibrium position where the environmental loads are balanced by the mooring forces to avoid the conflict between the control action of thruster assistance and the mooring system. To chase this SP, the thruster assistance provides additional damping and restoring forces to compensate the dynamic environmental loads while the mooring system compensates the mean environmental loads. The simulations and experiments suggested that the proposed SP chasing for moderate conditions improved the vessel performance while the utilization of the mooring system was maximized. Due to risk for mooring line breakage, the SP in extreme conditions is the position closer to the field zero point than the equilibrium position. To chase this SP, the thruster assistance provides damping, restoring force and mean force controls to compensate both the dynamic and a part of the mean environmental loads while the mooring system compensates the rest of the mean environmental loads. The simulations indicated that the proposed SP chasing for extreme conditions reduced the vessel's drift and tension in the most loaded line.</abstract><cop>New York</cop><pub>IEEE</pub><doi>10.1109/JOE.2009.2034553</doi><tpages>11</tpages></addata></record> |
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subjects | Cables Control systems Cybernetics Damping Damping force Dynamical systems Dynamics Force control Frequency line breakage Loads (forces) Marine Marine technology Marine vehicles mean force Mooring Oceans Offshore oil wells restoring force setpoint (SP) chasing Simulation thruster-assisted position mooring (PM) Thrusters Vectors Vessels |
title | Setpoint Chasing for Thruster-Assisted Position Mooring |
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