Experimental study on the nonlinear pressure acting on a high-speed vessel in regular waves |
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Authors: | Forng-Chen Chiu Wen-Chuan Tiao Jenhwa Guo |
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Affiliation: | (1) Department of Engineering Science and Ocean Engineering, Faculty of Engineering, National Taiwan University, Taipei, Taiwan;(2) Preparatory Office of National Center for Ocean Research, National Applied Research Laboratories, Taipei, Taiwan;(3) Department of Marine Mechanical Engineering, Faculty of Engineering, Naval Academy, Zuoying, P.O. box 90175, Kaohsiung, 81303, Taiwan |
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Abstract: | It is well known that the hydrodynamic responses of a high-speed vessel traveling in regular head waves of even moderate wave
height can show significant nonlinear behavior, and so linear statistical techniques become insufficient for predicting the
statistics of responses in irregular waves. On the other hand, it has been shown that an approximate third-order Volterra
model is applicable to handling the statistics of some nonlinear seakeeping problems, such as motions and vertical hull girder
loads. In the present study, the focus is on the nonlinear behavior of the pressure responses of the hull surface, especially
on the pressures acting on alternately wet and dry areas near the waterline and on the bow zone with high deadrise angles
that may be subject to slight impact and water pile-up effects. To clarify the validity of applying Volterra modeling to this
problem, a series of experiments in regular and irregular head waves were carried out, and approximate third-order and fifth-order
Volterra models with the proposed algorithm for finding frequency response functions (FRFs) were applied as a means of validation.
In the present article, the first part of the validation was performed using experimental data in regular waves. It was confirmed
that the third-order Volterra model has adequate accuracy to simulate deterministically the variation of pressure responses
in regular waves of different wave steepness up to a wave amplitude to wavelength ratio of 0.01 even for the highly nonlinear
pressures acting on the above-mentioned areas of the hull surface. |
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Keywords: | Nonlinear pressure High-speed vessel Regular waves Volterra model Frequency response function |
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