With the development of the ocean resources, the design of the offshore platform attracts increasing attention. The wave load computation is an important part for the design of the offshore platform. Currently, model experiments are mainly used to get the wave load of the offshore platform, which is complex, inefficient, and error-prone. To improve the efficiency of calculation, more simplified formulas for the wave load computation were deduced based on the wave diffraction theory. Moreover, a simple method was proposed based on the Matlab and software was developed to calculate the wave load. Experiments were conducted by a designed cylinder floater model to obtain the values of the wave load. Some simulations were made to calculate the wave load under the condition that water depth, wave frequency and other relevant parameters were same with the experiments. The wave load values calculated by the software had similar change trends with that of the experiment data, which proved the feasibility of the formulas for the wave load computation based on diffraction theory and the accuracy of the numerical algorithm in the computation of wave load based on Matlab. Compared with the model experiments, the software based on the diffraction theory was a cheaper and convenient way to obtain the values of wave load when the platform in the ocean is designed. So the new method will improve the efficiency in the wave load computation and is in favour of the design of offshore platform. © Published under licence by IOP Publishing Ltd.

The objective of this study is to discuss the hydrodynamic performance of a wave energy converter using floating panels. A scale model was built in the laboratory at Hohai University, and then was employed to investigate the performance of developed wave energy device. In the physical model, the water surface fluctuation, motion of floating panels and the voltage output of the dynamos are simultaneously measured. Wave reflection coefficient and the energy output can be estimated directly using these measurements. Experimental results show that the present device is effective in controlling the wave energy and reducing the threat to the coastal area. When subjected to longer waves, the average output power and conversion efficiency of the WEC can be up to 0.65 W and 2.73%, respectively. Moreover, it is found that the load of the energy device should be carefully designed to match the local wave climate, in order to obtain the best energy conversion efficiency.
© 2020 by the International Society of Offshore and Polar Engineers (ISOPE).

The objective of this study is to discuss the hydrodynamic performance of a wave energy converter using floating panels. A scale model was built in the laboratory at Hohai University, and then was employed to investigate the performance of developed wave energy device. In the physical model, the water surface fluctuation, motion of floating panels and the voltage output of the dynamos are simultaneously measured. Wave reflection coefficient and the energy output can be estimated directly using these measurements. Experimental results show that the present device is effective in controlling the wave energy and reducing the threat to the coastal area. When subjected to longer waves, the average output power and conversion efficiency of the WEC can be up to 0.65 W and 2.73%, respectively. Moreover, it is found that the load of the energy device should be carefully designed to match the local wave climate, in order to obtain the best energy conversion efficiency. © 2020 by the International Society of Offshore and Polar Engineers (ISOPE).

Autonomous Underwater Vehicle (AUV) is a kind of equipment working in the ocean, which can collect hydrological parameters, detect submarine topography and so on. With the increasing depth of research and complexity of exploration, scientists concentrate on bionic-autonomous underwater vehicle (Bio-AUV). In this paper, three kinds of motion model is put forward based on the observation of fish movement, as Oscillating Model obeying Polynomial function (OMP), Undulatory Model obeying Polynomial function (UMP) and Undulatory Model obeying Exponential function (UME). The movement characteristics and hydrodynamic performance are analyzed for those motion models. Besides, the effect of motion amplitude and motion frequency are studied based on the UME. It shows that UME is the best motion model and adjusting motion amplitude is a better choice than adjusting motion frequency. This paper will do favor in physical prototype development and motion control of fish-like underwater vehicle. © 2018 IEEE.