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Performance estimation of resonance-enhanced dual-buoy wave energy converter using coupled time-domain simulation

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This paper presents the modeling methodology and performance evaluation of the resonance-enhanced dual-buoy WEC (Wave Energy Converter) by HEM (hydrodynamic & electro-magnetic) fully-coupled-dynamics time-domain-simulation program. The numerical results are systematically compared with the authors' 1/6-scale experiment. With a direct-drive linear generator, the WEC consists of dual floating cylinders and a moon-pool between the cylinders, which can utilize three resonance phenomena from moon-pool dynamics as well as heave motions of inner and outer buoys. The contact and friction between the two buoys observed in the experiment are also properly modeled in the time-domain simulation by the Coulomb-friction model. Moon-pool resonance peaks significantly exaggerated in linear potential theory are empirically adjusted through comparisons with measured values. A systematic comparative study between the simulations and experiments with and without PTO (power-take-off) is conducted, and the relative heave displacements/velocities and power outputs are well matched. Then, parametric studies are carried out with the simulation program to determine optimum generator parameters. The performance with various wave conditions is also assessed.

Highlights:
1. Dual-cylinder wave energy converter with moon-pool is designed to use three resonances.
2. Interaction between the dual cylinder and the linear generator is solved in time domain.
3. The proposed simulation model correlated to the experiments provides coincided results with experiments.
4. Moon-pool and guiding mechanisms between the cylinders influence dynamic response and power notably.
5. Optimum parameters of the linear generator are found using the correlated model.

Citation Formats

Texas A&M University. (2020). Performance estimation of resonance-enhanced dual-buoy wave energy converter using coupled time-domain simulation [data set]. Retrieved from https://mhkdr.openei.org/submissions/331.
Export Citation to RIS
Kang, HeonYong, Jin, Chungkuk, Kim, MooHyun, and Cho, Ilhyoung. Performance estimation of resonance-enhanced dual-buoy wave energy converter using coupled time-domain simulation. United States: N.p., 31 Aug, 2020. Web. https://mhkdr.openei.org/submissions/331.
Kang, HeonYong, Jin, Chungkuk, Kim, MooHyun, & Cho, Ilhyoung. Performance estimation of resonance-enhanced dual-buoy wave energy converter using coupled time-domain simulation. United States. https://mhkdr.openei.org/submissions/331
Kang, HeonYong, Jin, Chungkuk, Kim, MooHyun, and Cho, Ilhyoung. 2020. "Performance estimation of resonance-enhanced dual-buoy wave energy converter using coupled time-domain simulation". United States. https://mhkdr.openei.org/submissions/331.
@div{oedi_4558, title = {Performance estimation of resonance-enhanced dual-buoy wave energy converter using coupled time-domain simulation}, author = {Kang, HeonYong, Jin, Chungkuk, Kim, MooHyun, and Cho, Ilhyoung.}, abstractNote = {This paper presents the modeling methodology and performance evaluation of the resonance-enhanced dual-buoy WEC (Wave Energy Converter) by HEM (hydrodynamic & electro-magnetic) fully-coupled-dynamics time-domain-simulation program. The numerical results are systematically compared with the authors' 1/6-scale experiment. With a direct-drive linear generator, the WEC consists of dual floating cylinders and a moon-pool between the cylinders, which can utilize three resonance phenomena from moon-pool dynamics as well as heave motions of inner and outer buoys. The contact and friction between the two buoys observed in the experiment are also properly modeled in the time-domain simulation by the Coulomb-friction model. Moon-pool resonance peaks significantly exaggerated in linear potential theory are empirically adjusted through comparisons with measured values. A systematic comparative study between the simulations and experiments with and without PTO (power-take-off) is conducted, and the relative heave displacements/velocities and power outputs are well matched. Then, parametric studies are carried out with the simulation program to determine optimum generator parameters. The performance with various wave conditions is also assessed.

Highlights:
1. Dual-cylinder wave energy converter with moon-pool is designed to use three resonances.
2. Interaction between the dual cylinder and the linear generator is solved in time domain.
3. The proposed simulation model correlated to the experiments provides coincided results with experiments.
4. Moon-pool and guiding mechanisms between the cylinders influence dynamic response and power notably.
5. Optimum parameters of the linear generator are found using the correlated model.}, doi = {}, url = {https://mhkdr.openei.org/submissions/331}, journal = {}, number = , volume = , place = {United States}, year = {2020}, month = {08}}

Details

Data from Aug 31, 2020

Last updated Nov 23, 2021

Submitted Aug 31, 2020

Organization

Texas A&M University

Contact

HeonYong Kang

979.218.0846

Authors

HeonYong Kang

Texas AM University

Chungkuk Jin

Texas AM University

MooHyun Kim

Texas AM University

Ilhyoung Cho

Jeju National University

DOE Project Details

Project Name An Innovative SR-WEC for a Market-Disruptive LCOE

Project Lead Carrie Noonan

Project Number EE0008630

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