engleski

Experimental Determination of Wave Pattern Resistance of a Trimaran

The experimental determination of wave spectra and wave resistance from measurements of the wave pattern behind a ship model while being towed in a tank received considerable attention in the sixties and seventies. The Landweber, Hogben and Baba methods of experimental determination of wave pattern resistance based on wave height measurements in several longitudinal measurement cuts have been introduced in this paper. The programme of experimental determination of wave pattern resistance has been carried out in DINMA-Trieste for a trimaran whose individual hulls are Wigley parabolic models, for the Froude number range 0.254-0.420, with a total of 12 runs. The above mentioned methods are based on identical hydrodynamic model, and a starting basis are identical analytic expressions. By experimental determination of wave pattern resistance, a comparison of the calculation results (amplitude spectrum, wave resistance, reconstructed waveforms) is given. It has been shown that all three methods are equal and that they give the same results if the criteria based on frequency content determination and resolution in frequency are respected.

wave height measurements; wave pattern resistance; trimaran

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