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- W655051906 abstract "For seakeeping tests in a standard towing tank with self- propelled marine models, even in oblique waves, this paper proposes a model testing technique using tailored transient design wave packets and vertical side wall wave absorbers. The proposed method allows the determination of all motion transfer functions by magnitude and phase. For model excitation, wave packets are developed which combine broad energy spectra in the relevant frequency domain as well as a short extension at the location of wave/model interaction. If a model is investigated in a transient wave train, the exciting wave and the corresponding response (force, motion, etc) are complex Fourier spectra. If both complex Fourier spectra are related to the same location, the complex division directly yields the frequency dependent transfer function by magnitude and phase. As model and wave probe are not necessarily moving with the same velocity, especially if the vessel is sailing in oblique waves, a time domain procedure is introduced for transforming the registration of the wave elevation from the wave probe position on the carriage to the model position. The new technique is demonstrated by analysing the motion behaviour of a towed high speed catamaran and a self-propelled monohull. The entire model test, including start of the wave generator, start of model and carriage, and the activation of the automatic steering system, which is putting the helm, is computer controlled. Model motions are measured by using strapdown accelerometers. As a result, heave, pitch, yaw, and roll characteristics of any structure at arbitrary Froude-number and in optional seaways can be evaluated with just two or three short experiments. As tank wall effects cannot be neglected if hydrodynamically compact models are investigated, this paper also illustrates the necessity of vertical side wall wave absorbers." @default.
- W655051906 created "2016-06-24" @default.
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- W655051906 date "1995-01-01" @default.
- W655051906 modified "2023-09-27" @default.
- W655051906 title "TRANSIENT WAVE PACKETS - AN EFFICIENT TECHNIQUE FOR SEAKEEPING TESTS OF SELF-PROPELLED MODELS IN OBLIQUE WAVES" @default.
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