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论文类型： 期刊论文

发表时间： 2016-06-01

发表刊物： CHINA OCEAN ENGINEERING

收录刊物： SCIE、EI、ISTIC、Scopus

卷号： 30

期号： 3

页面范围： 421-430

ISSN号： 0890-5487

关键字： floating body; nonlinear wave; motion trajectory; drift speed; oscillation period

摘要： Nonlinear behaviors of a free-floating body in waves were experimentally investigated in the present study. The experiments were carried out for 6 different wave heights and 6 different wave periods to cover a relatively wide range of wave nonlinearities. A charge-coupled device (CCD) camera was used to capture the real-time motion of the floating body. The measurement data show that the sway, heave and roll motions of the floating body are all harmonic oscillations while the equilibrium position of the sway motion drifts in the wave direction. The drift speed is proportional to wave steepness when the size of the floating body is comparable to the wavelength, while it is proportional to the square of wave steepness when the floating body is relatively small. In addition, the drift motion leads to a slightly longer oscillation period of the floating body than the wave period of nonlinear wave and the discrepancy increases with the increment of wave steepness.