Experimental Study of Nonlinear Behaviors of A Free-Floating Body in Waves  

作　　者：贺铭 任冰 邱大洪 

机构地区：[1]State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology

出　　处：《China Ocean Engineering》2016年第3期421-430,共10页中国海洋工程（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.11272079);the National Basic Research Program of China(973 Program,Grant No.2011CB013702)

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.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.

关 键 词：floating body nonlinear wave motion trajectory drift speed oscillation period 

分 类 号：P731.22[天文地球—海洋科学] P75