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Citation:
　Liang Zhang,Peng Jin,Binzhen Zhou,et al.Oscillation and Conversion Performance of Double-Float Wave Energy Converter[J].Journal of Marine Science and Application,2019,(1):54-63.[doi:10.1007/s11804-019-00083-9]
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Oscillation and Conversion Performance of Double-Float Wave Energy Converter

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Title:
Oscillation and Conversion Performance of Double-Float Wave Energy Converter
Author(s):
Liang Zhang1;  Peng Jin1;  Binzhen Zhou1;  Xiongbo Zheng2;  Hengxu Liu1
Affilations:
Author(s):
Liang Zhang1;  Peng Jin1;  Binzhen Zhou1;  Xiongbo Zheng2;  Hengxu Liu1
1 College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China;
2 College of Science, Harbin Engineering University, Harbin 150001, China
Keywords:
Double-float WEC; Energy conversion; Capture width ratio; Optimal damping; Resonance
分类号:
-
DOI:
10.1007/s11804-019-00083-9
Abstract:
In this study, we investigated the hydrodynamic and energy conversion performance of a double-float wave energy converter (WEC) based on the linear theory of water waves. The generator power take-off (PTO) system is modeled as a combination of a linear viscous damping and a linear spring. Using the frequency domain method, the optimal damping coefficient of the generator PTO system is derived to achieve the optimal conversion efficiency (capture width ratio). Based on the potential flow theory and the higher-order boundary element method (HOBEM), we constructed a threedimensional model of double-float WEC to study its hydrodynamic performance and response in the time domain. Only the heave motion of the two-body system is considered and a virtual function is introduced to decouple the motions of the floats. The energy conversion character of the double-float WEC is also evaluated. The investigation is carried out over a wide range of incident wave frequency. By analyzing the effects of the incident wave frequency, we derive the PTO’s damping coefficient for the double-float WEC’s capture width ratio and the relationships between the capture width ratio and the natural frequencies of the lower and upper floats. In addition, it is capable to modify the natural frequencies of the two floats by changing the stiffness coefficients of the PTO and mooring systems. We found that the natural frequencies of the device can directly influence the peak frequency of the capture width, which may provide an important reference for the design of WECs.

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Memo

Memo:
Received date:2017-10-12。
Foundation item:This work was supported by the National Natural Science Foundation of China (51409066,51761135013),High Technology Ship Scientific Research Project from the Ministry of Industry and Information Technology of the People’s Republic of China-Floating Security Platform Project (the second stage,201622), and the Fundamental Research Fund for the Central University (HEUCFJ180104,HEUCFP1809).
Corresponding author:Binzhen Zhou,zhoubinzhen@hrbeu.edu.cn
Last Update: 2019-05-14