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Optimal design of an axisymmetric two-body wave energy converter with translational hydraulic power take-off system

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  • Kamarlouei, Mojtaba
  • Gaspar, J.F.
  • Guedes Soares, C.

Abstract

An optimized concept of axisymmetric concentric two-body wave energy converter is proposed, consisting of a torus and a floater, which are outer and inner bodies, respectively. The energy extraction is based on the relative motion of the bodies, which is the heave motion. The hydrodynamic characteristics of the two-body system are analyzed in the frequency-domain to evaluate the efficiency in sub-optimal conditions and an extended coupled hydrodynamic model is developed in the frequency and time-domain. To obtain the hydrodynamic coefficients of the two bodies, an open-source boundary element method code is used. The code is validated with the results of a similar concept. The time-domain model and simulator are developed based on the hydrodynamic coefficients calculated in the frequency-domain. A simplified power take-off system including a realistic hydraulic cylinder is modeled in the time domain and used for the optimization process. The optimization considers the hydrodynamic efficiency of different torus shapes and maximizing the pressure and power in the hydraulic power take-off system. The results show that the cone shape torus presents higher efficiency while the max-mean power ratio of the wave energy converter is compared in different cylinder sizes with optimal power take-off parameters.

Suggested Citation

  • Kamarlouei, Mojtaba & Gaspar, J.F. & Guedes Soares, C., 2022. "Optimal design of an axisymmetric two-body wave energy converter with translational hydraulic power take-off system," Renewable Energy, Elsevier, vol. 183(C), pages 586-600.
    • Handle: RePEc:eee:renene:v:183:y:2022:i:c:p:586-600
    DOI: 10.1016/j.renene.2021.10.090
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    References listed on IDEAS

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    1. Berenjkoob, Mahdi Nazari & Ghiasi, Mahmoud & Soares, C.Guedes, 2021. "Influence of the shape of a buoy on the efficiency of its dual-motion wave energy conversion," Energy, Elsevier, vol. 214(C).
    2. Calvário, M. & Gaspar, J.F. & Kamarlouei, M. & Hallak, T.S. & Guedes Soares, C., 2020. "Oil-hydraulic power take-off concept for an oscillating wave surge converter," Renewable Energy, Elsevier, vol. 159(C), pages 1297-1309.
    3. Paula B. Garcia-Rosa & Giorgio Bacelli & John V. Ringwood, 2015. "Control-Informed Geometric Optimization of Wave Energy Converters: The Impact of Device Motion and Force Constraints," Energies, MDPI, vol. 8(12), pages 1-16, December.
    4. Gaspar, José F. & Calvário, Miguel & Kamarlouei, Mojtaba & Soares, C. Guedes, 2018. "Design tradeoffs of an oil-hydraulic power take-off for wave energy converters," Renewable Energy, Elsevier, vol. 129(PA), pages 245-259.
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    Cited by:

    1. He, Lipeng & Liu, Renwen & Liu, Xuejin & Zhang, Zheng & Zhang, Limin & Cheng, Guangming, 2023. "A novel piezoelectric wave energy harvester based on cylindrical-conical buoy structure and magnetic coupling," Renewable Energy, Elsevier, vol. 210(C), pages 397-407.
    2. Li, Ai-jun & Liu, Yong & Wang, Xin-yu, 2022. "Hydrodynamic performance of a horizontal cylinder wave energy converter in front of a partially reflecting vertical wall," Renewable Energy, Elsevier, vol. 194(C), pages 1034-1047.
    3. Han, Meng & Cao, Feifei & Shi, Hongda & Zhu, Kai & Dong, Xiaochen & Li, Demin, 2023. "Layout optimisation of the two-body heaving wave energy converter array," Renewable Energy, Elsevier, vol. 205(C), pages 410-431.

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