Testing Ship models in Transient Waves
Research and development rept.
DAVID TAYLOR MODEL BASIN WASHINGTON DC HYDROMECHANICS LAB
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The seaworthiness characteristics of a ship design are often determined by a series of model tests in regular waves. This report describes a new model test procedure which makes use of a transient wave disturbance having energy distributed over all wave lengths of interest. With the use of this transient wave technique, the testing time required to characterize a model is reduced by an order of magnitude. In this report, the basic behavior of a unidirectional transient wave is discussed, and a simple Fourier transformation is developed to link wave height records measured at any two separated points along the path of such a wave. A particular form of transient wave, which is approximately sinusoidal with linearly varying frequency, has been used to test successfully a number of ship models. The results of these tests are presented and the practical problems in generating, measuring, and analyzing transient wave tests are discussed.
- Marine Engineering
- Test Facilities, Equipment and Methods