双圆柱形浮体波能装置双自由度响应及转换效率分析

Wu, Botao; Wang, Xing; Diao, Xianghong; Zhang, YunQiu

doi:10.1360/132012-598

Cited by 3 publications

(2 citation statements)

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“…Zhang et al (2016) used an analytical method to study the relationship between the natural frequencies of floats and the conversion efficiency of the WEC, but focused on the effects of the damping plate, PTO stiffness coefficient, and mooring stiffness coefficient. Neither Wu et al (2013) nor Zhang et al (2016) proposed an expression for the optimal PTO damping coefficient.…”

Section: Article Highlightsmentioning

confidence: 99%

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Oscillation and Conversion Performance of Double-Float Wave Energy Converter

Zhang

Jin

Zhou

et al. 2019

J. Marine. Sci. Appl.

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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 takeoff (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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Section: Article Highlightsmentioning

confidence: 99%

“…Eriksson et al (2005) studied the damped oscillation and efficiency of a cylindrical WEC in both regular waves and real marine conditions. Wu et al (2013) studied the radiation and diffraction problems of both floating-cylinder…”

Section: Introductionmentioning

confidence: 99%

Oscillation and Conversion Performance of Double-Float Wave Energy Converter

Zhang

Jin

Zhou

et al. 2019

J. Marine. Sci. Appl.

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Numerical study of hydrodynamic behavior and conversion efficiency of a two-buoy wave energy converter

Yang

Zhang

2018

J Hydrodyn

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Motion Analysis and Power Responses of a Single-buoy Wave Energy Converter Consisting of Double Hydraulic Cylinders

Li¹,

Gao

2015

Proceedings of the 2015 International Conference on Applied Science and Engineering Innovation

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Abstract.A single-buoy wave energy converter (WEC) consisting of double hydraulic cylinders is designed to promote the conversion power of traditional oscillating buoy WEC by absorbing the energy of pitching motion. On the condition of linear, regular waves, the nonlinear coupled equations of the pitching-heaving motions of buoy and energy conversion expressions are deduced with a wave incident angle of zero. Then the motion characteristics and power responses are analyzed. Calculations indicate that the heaving and pitching motions can be expressed as approximate simple harmonic motions with wave period. The wave circular frequency and draft of buoy have obvious influences on the amplitude-frequency responses. When the draft is larger than 1.0 m, the curves of heaving motion exhibit single-peak patterns and the peak values are discovered at the circular frequency of about 2.5 rad/s. The amplitude-frequency responses of pitching motion share the similar trends, and the peak amplitudes change regularly with draft and circular frequency. The heaving motion and pitching motion together influence the conversion power. For the cases in this paper, larger draft can increase the conversion power on the whole. According to the power contribution of pitching motion, the rates of conversion power of pitching motion usually exceed 20%. Therefore, the conversion power of traditional oscillating buoy WEC is expected to be improved effectively by absorbing the energies of multiple freedoms.

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双圆柱形浮体波能装置双自由度响应及转换效率分析

Cited by 3 publications

References 0 publications

Oscillation and Conversion Performance of Double-Float Wave Energy Converter

Oscillation and Conversion Performance of Double-Float Wave Energy Converter

Numerical study of hydrodynamic behavior and conversion efficiency of a two-buoy wave energy converter

Motion Analysis and Power Responses of a Single-buoy Wave Energy Converter Consisting of Double Hydraulic Cylinders

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