Multi-stable mechanism of an oscillating-body wave energy converter

Liang Li; Xiantao Zhang; Zhiming Yuan; Yan Gao

doi:10.1109/TSTE.2019.2896991

Multi-stable mechanism of an oscillating-body wave energy converter

Liang Li
, Xiantao Zhang
, Zhiming Yuan
, Yan Gao

Naval Architecture, Ocean And Marine Engineering

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

113 Downloads (Pure)

Abstract

The present research aims to utilize the multi-stable mechanism to increase the energy conversion of the oscillating-body wave energy converter (WEC). Considering that a majority of WEC concepts are linear and single-stable, a nonlinear spring-damper model is proposed to achieve the multi-stable mechanism. The system is either monostable or bistable depending on the initial condition of the springs. The energy conversion of a heaving point-absorber with the nonlinear spring-damper model is investigated in the present research. Firstly, a state-space dynamic model of the heaving point-absorber is developed. Then the energy conversion at both the monostable mode and the bistable mode is simulated. The present research also illustrates the response feature at the two stable modes. It is found the nonlinear point-absorber behaves like a linear system in the monostable mode. The energy conversion is just increased slightly. Nevertheless, the energy absorption is increased substantially in the bistable mode. It is found that the velocity phase is adjusted in the bistable mode, leading to the enhancement of the energy conversion.

Original language	English
Pages (from-to)	500-508
Number of pages	9
Journal	IEEE Transactions on Sustainable Energy
Volume	11
Issue number	1
Early online date	1 Feb 2019
DOIs	https://doi.org/10.1109/TSTE.2019.2896991
Publication status	Published - 30 Jan 2020

Funding

Manuscript received August 20, 2018; revised November 15, 2018 and January 5, 2019; accepted January 29, 2019. Date of publication February 1, 2019; date of current version December 18, 2019. This work was supported by the China Scholarship Council under Grant 201506230127. Paper no. TSTE-00835-2018. (Corresponding author: Zhiming Yuan.) L. Li, Z. Yuan, and Y. Gao are with the Department of Naval Architecture, Ocean and Marine Engineering, University of Strathclyde, Glasgow G4 0LZ, U.K. (e-mail:, [email protected]; [email protected]; [email protected]).

Keywords

energy absorption
multi-stable mechanism
power take-off system
renewable energy
Wave energy converter (WEC)

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10.1109/TSTE.2019.2896991

Li-etal-IEEE-TSE-2019-Multi-stable-mechanism-of-an-oscillating-body-waveAccepted author manuscript, 1.54 MB

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abstract = "The present research aims to utilize the multi-stable mechanism to increase the energy conversion of the oscillating-body wave energy converter (WEC). Considering that a majority of WEC concepts are linear and single-stable, a nonlinear spring-damper model is proposed to achieve the multi-stable mechanism. The system is either monostable or bistable depending on the initial condition of the springs. The energy conversion of a heaving point-absorber with the nonlinear spring-damper model is investigated in the present research. Firstly, a state-space dynamic model of the heaving point-absorber is developed. Then the energy conversion at both the monostable mode and the bistable mode is simulated. The present research also illustrates the response feature at the two stable modes. It is found the nonlinear point-absorber behaves like a linear system in the monostable mode. The energy conversion is just increased slightly. Nevertheless, the energy absorption is increased substantially in the bistable mode. It is found that the velocity phase is adjusted in the bistable mode, leading to the enhancement of the energy conversion.",

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N2 - The present research aims to utilize the multi-stable mechanism to increase the energy conversion of the oscillating-body wave energy converter (WEC). Considering that a majority of WEC concepts are linear and single-stable, a nonlinear spring-damper model is proposed to achieve the multi-stable mechanism. The system is either monostable or bistable depending on the initial condition of the springs. The energy conversion of a heaving point-absorber with the nonlinear spring-damper model is investigated in the present research. Firstly, a state-space dynamic model of the heaving point-absorber is developed. Then the energy conversion at both the monostable mode and the bistable mode is simulated. The present research also illustrates the response feature at the two stable modes. It is found the nonlinear point-absorber behaves like a linear system in the monostable mode. The energy conversion is just increased slightly. Nevertheless, the energy absorption is increased substantially in the bistable mode. It is found that the velocity phase is adjusted in the bistable mode, leading to the enhancement of the energy conversion.

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Multi-stable mechanism of an oscillating-body wave energy converter

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