Power take-off mechanism analysis of oscillating-buoy wave energy converter

被引：0
|
作者：
Zhang W. [1 ]
Zhou Y. [2 ]
Zhou X. [1 ]
机构：
[1] College of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang
[2] College of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang
来源：
| 1600年 / Chinese Vibration Engineering Society卷 / 39期
关键词：
Analytical solution; Nonlinear PTO; Over-damped modification; Wave energy conversion;
D O I：
10.13465/j.cnki.jvs.2020.11.005
中图分类号：
学科分类号：
摘要：
As one of the main components,the Power Take-Off (PTO) mechanism is very important to the motion and power conversion for the Wave Energy Converter (WEC).Based upon the potential flow theory, the series expression of velocity potential function of the basin where the cylindrical floating body is located was obtained by using the eigenfunction expansion method.Then the analytical expressions of additional mass, damping coefficient and wave exciting force of the floating body were obtained by the boundary matching method.According to the characteristics of the PTO damper, the motion and wave energy conversion characteristics of the float under the linear and nonlinear PTO damping were studied respectively, and the over-damping problem under the linear PTO damping was emphatically explored.The results show that the influence of PTO system with low velocity index on the motion of the device is mainly reflected in the PTO damping coefficient. With the increase of damping coefficient, the resonance frequency of the wave energy device decreases gradually, also the decrease amplitude is very small.The nonlinear characteristics of PTO system cannot change the optimal transfer efficiency of the float, but the large velocity index can effectively improve the damping capacity of PTO system.At lower and higher frequencies, the optimal PTO damping obtained by the analytic algorithm will make the device reaching an over-damped state. The highest frequency in the low frequency part and the lowest frequency in the high frequency part which need to be modified will gradually decrease with the increase of radius and draught. © 2020, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：38 / 44
页数：6
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