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1987•Transactions - Society of Naval Architects and Marine EngineersRequires access

MODEL TESTS AND COMPUTER SIMULATIONS--AN EFFECTIVE COMBINATION FOR INVESTIGATION OF BROACHING PHENOMENA

Olle Rutgersson, Peter Ottosson

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Abstract

Difficulties in staying on course, combined with large rolling amplitudes, are problems experienced by most vessels operating in heavy following or stern quartering seas. Broaching occurs when the conditions are so severe that control of the vessel is lost. In Sweden, where a large number of patrol craft operate around the coast, this is a major seakeeping problem. This paper gives the results of development work by the authors. A method implying a combination of model tests and time-domain computer simulations is presented. Results showing the utility of the method for studies of transverse stability and coursekeeping behavior for a patrol craft are given. The influence on behavior in following seas of changing to waterjets on a triple-screw patrol vessel is also shown. Finally, the definition of broaching is discussed in relation to the helmsman's work.

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Difficulties in staying on course, combined with large rolling amplitudes, are problems experienced by most vessels operating in heavy following or stern quartering seas. Broaching occurs when the conditions are so severe that control of the vessel is lost. In Sweden, where a large number of patrol craft operate around the coast, this is a major seakeeping problem. This paper gives the results of development work by the authors. A method implying a combination of model tests and time-domain computer simulations is presented. Results showing the utility of the method for studies of transverse stability and coursekeeping behavior for a patrol craft are given. The influence on behavior in following seas of changing to waterjets on a triple-screw patrol vessel is also shown. Finally, the definition of broaching is discussed in relation to the helmsman's work.

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Available abstract

Difficulties in staying on course, combined with large rolling amplitudes, are problems experienced by most vessels operating in heavy following or stern quartering seas. Broaching occurs when the conditions are so severe that control of the vessel is lost. In Sweden, where a large number of patrol craft operate around the coast, this is a major seakeeping problem. This paper gives the results of development work by the authors. A method implying a combination of model tests and time-domain computer simulations is presented. Results showing the utility of the method for studies of transverse stability and coursekeeping behavior for a patrol craft are given. The influence on behavior in following seas of changing to waterjets on a triple-screw patrol vessel is also shown. Finally, the definition of broaching is discussed in relation to the helmsman's work.

Key concepts: Seakeeping, Broaching, Stern, Engineering, Work (physics), Domain (mathematical analysis), Marine engineering, Operations research

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MODEL TESTS AND COMPUTER SIMULATIONS--AN EFFECTIVE COMBINATION FOR INVESTIGATION OF BROACHING PHENOMENA — Research Paper | ScholarLens