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Researches on the Williamson Turn for Very Large Carriers

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The purpose of this paper is to improve the Williamson turn maneuver procedure stipulated in the International Aeronautical and Maritime Search and Rescue Manual (IAMSAR ), which can hardly be applied directly to Very Large Carriers (VLCs). With the rapid increase in tonnage and rated speed of vessels, the special maneuverability of VLC is fully recognized. In this note, the MMG (Ship Manoeuvring Mathematical Model Group) model is adopted and a series of simulation studies are made. Experimental results show that the Williamson turn maneuver is not suitable to VLCs. The key factor that leads to the invalidation is the great inertia and dynamic instability of VLCs. Based on seagoing experience and many simulation trials, three suggestions are provided to modify or amend the Williamson turn maneuver. The revised Williamson turn maneuver can be used effectually for VLCs to deal with the emergency condition "person overboard". A simulation experiment is shown to illustrate the effectiveness of the suggested approach.
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Keywords: Very Large Carriers (VLCs); Williamson turn maneuver

Document Type: Research Article

Publication date: December 1, 2013

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  • The Naval Engineers Journal is the peer-reviewed journal of the American Society of Naval Engineers (ASNE). ASNE is the leading professional engineering society for engineers, scientists and allied professionals who conceive, design, develop, test, construct, outfit, operate and maintain complex naval and maritime ships, submarines and aircraft and their associated systems and subsystems.
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