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Ship motion test
In marine engineering, hydrodynamic tests are performed with ship models, for the purpose of designing a new (full sized) ship, or refining the design of a ship to improve its performance at sea. Tests are carried out in a ship model basin or "towing tank". There are various types of test: the model may be towed along a straight line or circular path, and may be subjected to oscillations. Forces acting on the vessel are measured using a dynamometer. The tests may be evaluating the overall design, or focusing on the characteristics of a propeller.
==Straight line test==
The velocity-dependent derivatives Yv and Nv of the ship at any draft and trim can be determined from the model test carried in the towing tank. The model is towed with a constant velocity corresponding to a given ship Froude number at various angles of attack, β. A dynamometer at the origin O, measures the force Y and the moment N experienced by the model at each value of β. The dimensional ship values of the derivatives can then be obtained by multiplying the non-dimensional derivatives by the same respective combinations of ship length, ship speed and sea water density.
It can also be used to determine the cross-coupling effects of v on Yδ and Nδ and of δR on Yv and Nv.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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