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dc.contributor.advisorMook, Dean T.en_US
dc.contributor.advisorHendricks, Scott L.en_US
dc.contributor.advisorNayfeh, Ali H.en_US
dc.contributor.authorHenry, Ryan J.en_US
dc.date.accessioned2011-08-06T16:02:41Z
dc.date.available2011-08-06T16:02:41Z
dc.date.issued1997-05-08en_US
dc.identifier.otheretd-070899-145159en_US
dc.identifier.urihttp://hdl.handle.net/10919/10037
dc.description.abstractIt is sometimes necessary to transfer cargo from a large ship to a smaller ship at sea. Specially designed craneships are used for this task, however the wave-induced motions of the ship can cause large pendulations of cargo being hoisted by a ship-mounted crane. This makes cargo transfer in rough seas extremely dangerous and therefore transfer operations normally cease when sea state 3 is reached. If the cargo pendulations could be reduced in higher sea states, transfer operations would be possible. By controlling the boom luff angle, one can reduce the cargo pendulations in the plane of the boom significantly. A two-dimensional pendulum with a rigid massless cable and massive point load is used to model the system. A control law using time-delayed position feedback is developed and the system is simulated on a computer using the full nonlinear equations of motion. A three-degree-of-freedom ship-motion simulation platform, capable of simulating heave, pitch, and roll motions, was built. The computer simulation results were experimentally verified by mounting a 1/24th scale model of a T-ACS crane on the ship-motion simulation platform.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartthesis.pdfen_US
dc.rightsThe authors of the theses and dissertations are the copyright owners. Virginia Tech's Digital Library and Archives has their permission to store and provide access to these works.en_US
dc.source.urihttp://scholar.lib.vt.edu/theses/available/etd-070899-145159en_US
dc.subjectcrane controlen_US
dc.subjectship-mounted craneen_US
dc.subjecttime-delayed feedbacken_US
dc.titleCargo Pendulation Reduction on Ship-Mounted Cranesen_US
dc.typeThesisen_US
dc.contributor.departmentEngineering Mechanicsen_US
dc.description.degreeMSen_US


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