Robust performance improvement of a raft-type wave energy converter using a nonlinear stiffness mechanism

被引：31

作者：

Zhang, Haicheng ^{[1
]}

Zhang, Jiale ^{[1
]}

Zhou, Xiao ^{[1
]}

Shi, Qijia ^{[1
]}

Xu, Daolin ^{[1
]}

Sun, Ze ^{[2
]}

Lu, Ye ^{[2
]}

Wu, Bo ^{[3
]}

机构：

[1] Hunan Univ, Coll Mech & Vehicle Engn, Changsha 410082, Peoples R China

[2] China Ship Sci Res Ctr, Wuxi 214082, Jiangsu, Peoples R China

[3] Hunan Hydroforce Technol Co Ltd, Changsha 410082, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES | 2021年 / 211卷

基金：

中国国家自然科学基金;

关键词：

Wave energy harvesting; Hinge; Efficiency; Nonlinear stiffness; Phase control; POWER CAPTURE PERFORMANCE; DYNAMIC-RESPONSE; TAKE-OFF; EXTRACTION; EFFICIENCY; DEVICE;

D O I：

10.1016/j.ijmecsci.2021.106776

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

In order to enhance the capture efficiency and broaden the bandwidth, a novel rotation Power Take-off with nonlinear stiffness is proposed and applied to a traditional raft-type wave energy converter (WEC). Refer to Cummins' equation, the governing equations of motion for a WEC with nonlinear stiffness in the time domain is established based on linear hydrodynamic model. The harmonic balance method is employed to solve the set of nonlinear dynamic equations. The characteristics of the wave absorption in regular and irregular waves are analyzed by using numerical simulations. The effects of the systematic parameters and wave conditions on wave energy capture efficiency are analyzed. The numerical results show that the nonlinear stiffness mechanism with appropriate parameters can enhance capture efficiency and broaden frequency bandwidth of the energy capture. Robust performance improvement without complex nonlinear phenomena of jumping and multiple solutions is revealed by using the analytical solutions. The nonlinear stiffness mechanism can provide a role of phase control for the raft-type WEC.

引用

页数：17

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