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A sensitivity study on the effect of mass distribution of a single-tether spherical point absorber

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Listed:
  • Meng, Fantai
  • Cazzolato, Benjamin
  • Li, Ye
  • Ding, Boyin
  • Sergiienko, Natalia
  • Arjomandi, Maziar

Abstract

In previous work, a single-tether submerged spherical point absorber with asymmetric mass distribution (SPAMD) was proposed to enable harvesting wave energy induced by the surge and heave motion of the buoy. By taking advantage of the motion coupling arising from the asymmetric mass distribution of the buoy, the SPAMD was found to be up to 3 times more efficient than a generic single-tether point absorber (with uniform mass distribution buoy) under regular waves. For motion-coupled systems like the SPAMD, the mass distribution is a significant factor that governs the kinematics and the efficiency of the device. Therefore, in this paper, a 3DOF (surge, heave and pitch) spectral-domain model considering viscous drag was developed, to investigate the sensitivity of the mass distribution on the power output of the SPAMD in irregular waves. The aim of the sensitivity study is to provide a guideline for the wave energy industry when designing such devices. At the end of this paper, the yearly mean power output of the SPAMD with optimal mass distribution was assessed at three test sites near Yeu Island (France), Perth (Australia) and Sydney (Australia). It was found that in such sea sites, the SPAMD was at least 1.5 times more efficient than the generic single-tether point absorber, indicating that the SPAMD might have a significant commercial potential. Furthermore, for the three sites investigated, the performance of the SPAMD was found to be relatively tolerant to non-optimal PTO configuration, implying that sea-state specific tuning is unnecessary.

Suggested Citation

  • Meng, Fantai & Cazzolato, Benjamin & Li, Ye & Ding, Boyin & Sergiienko, Natalia & Arjomandi, Maziar, 2019. "A sensitivity study on the effect of mass distribution of a single-tether spherical point absorber," Renewable Energy, Elsevier, vol. 141(C), pages 583-595.
    • Handle: RePEc:eee:renene:v:141:y:2019:i:c:p:583-595
    DOI: 10.1016/j.renene.2019.03.149
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    References listed on IDEAS

    as
    1. Sergiienko, N.Y. & Cazzolato, B.S. & Ding, B. & Hardy, P. & Arjomandi, M., 2017. "Performance comparison of the floating and fully submerged quasi-point absorber wave energy converters," Renewable Energy, Elsevier, vol. 108(C), pages 425-437.
    2. Meng, Fantai & Ding, Boyin & Cazzolato, Benjamin & Arjomandi, Maziar, 2019. "Modal analysis of a submerged spherical point absorber with asymmetric mass distribution," Renewable Energy, Elsevier, vol. 130(C), pages 223-237.
    3. Pelc, Robin & Fujita, Rod M., 2002. "Renewable energy from the ocean," Marine Policy, Elsevier, vol. 26(6), pages 471-479, November.
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    Cited by:

    1. Gao, Qiang & Khan, Salman Saeed & Sergiienko, Nataliia & Ertugrul, Nesimi & Hemer, Mark & Negnevitsky, Michael & Ding, Boyin, 2022. "Assessment of wind and wave power characteristic and potential for hybrid exploration in Australia," Renewable and Sustainable Energy Reviews, Elsevier, vol. 168(C).
    2. Meng, Fantai & Rafiee, Ashkan & Ding, Boyin & Cazzolato, Benjamin & Arjomandi, Maziar, 2020. "Nonlinear hydrodynamics analysis of a submerged spherical point absorber with asymmetric mass distribution," Renewable Energy, Elsevier, vol. 147(P1), pages 1895-1908.
    3. Wang, LiGuo & Ringwood, John V., 2021. "Control-informed ballast and geometric optimisation of a three-body hinge-barge wave energy converter using two-layer optimisation," Renewable Energy, Elsevier, vol. 171(C), pages 1159-1170.

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