Skip to main content

Research of Power Take-off System for “Sharp Eagle II” Wave Energy Converter


The “Sharp Eagle” device is a wave energy converter of a hinged double floating body. The wave-absorbing floating body hinges on the semi-submerged floating body structure. Under the action of wave, the wave-absorbing floating body rotates around the hinge point, and the wave energy can be converted into kinetic energy. In this paper, the power take-off system of “Sharp Eagle II” wave energy converter (the second generation of “Sharp Eagle”) was studied, which adopts the hydraulic type power take-off system. The 0–1 power generation mode was applied in this system to make the “Sharp Eagle II” operate under various wave conditions. The principle of power generation was introduced in detail, and the power take-off system was simulated. Three groups of different movement period inputs were used to simulate three kinds of wave conditions, and the simulation results were obtained under three different working conditions. In addition, the prototype of “Sharp Eagle II” wave energy converter was tested on land and in real sea conditions. The experimental data have been collected, and the experimental data and simulation results were compared and validated. This work has laid a foundation for the design and application of the following “Sharp Eagle” series of devices.

This is a preview of subscription content, access via your institution.


  • Cuadra, L., Salcedo-sanz, S., Nieto-Borge, J.C., Alexandre, E. and Rodríguez, G., 2016. Computational intelligence in wave energy: Comprehensive review and case study, Renewable and Sustainable Energy Reviews, 58, 1223–1246.

    Article  Google Scholar 

  • de O Falcão, A. F., 2010. Wave energy utilization: a review of the technologies, Renewable and Sustainable Energy Reviews, 14(3), 899–918.

    Article  Google Scholar 

  • Han J.X., 2015. China’s Offshore Ocean: Marine Renewable Energy, China Ocean Press, Beijing, pp. 114–115. (in Chinese)

    Google Scholar 

  • Hansen, R.H., Kramer, M.M. and Vidal, E., 2013. Discrete displacement hydraulic power take-off system for the wavestar wave energy converter, Energies, 6(8), 4001–4044.

    Article  Google Scholar 

  • Heath, T., Whittaker, T.J.T. and Boake, C.B., 2000. The design, construction and operation of the LIMPET wave energy converter (Islay, Scotland), Proceedings of the 4th European Wave Power Conference, Aalborg, Denmark, pp. 49–55.

  • Henderson, R., 2006. Design, simulation, and testing of a novel hydraulic power take-off system for the Pelamis wave energy converter, Renewable Energy, 31(2), 271–283.

    Article  MathSciNet  Google Scholar 

  • Kofoed, J.P., Frigaard, P., Friis-Madsen, E., Sørensen, H.C., 2006. Prototype testing of the wave energy converter wave dragon, Renewable Energy, 31(2), 181–189.

    Article  Google Scholar 

  • Kramer, M., Marquis, L. and Frigaard, P., 2011. Performance evaluation of the wavestar prototype, Proceedings of the 9th European Wave and Tidal Energy Conference, University of Southampton, Southampton, UK.

    Google Scholar 

  • Lasa, J., Antolin, J.C., Angulo, C., Estensoro, P., Santos, M. and Ricci, P., 2012. Design, construction and testing of a hydraulic power takeoff for wave energy converters, Energies, 5(6), 2030–2052.

    Article  Google Scholar 

  • Liu, Y.J., Li, Y., He, F.L. and Wang, H.F., 2017. Comparison study of tidal stream and wave energy technology development between China and some western countries, Renewable and Sustainable Energy Reviews, 76, 701–716.

    Article  Google Scholar 

  • López, I., Andreu, J., Ceballos, S., de Alegría, I.M. and Kortabarria, I., 2013. Review of wave energy technologies and the necessary power-equipment, Renewable and Sustainable Energy Reviews, 27, 413–434.

    Article  Google Scholar 

  • Mei, C.C., 2012. Hydrodynamic principles of wave power extraction, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 370(1959), 208–234.

    Article  MathSciNet  Google Scholar 

  • Sheng, S.W., Wang, K.L., Lin, H.J., Zhang, Y.Q., You, Y.G., Wang, Z.P., Chen, A.J., Jiang, J.Q., Wang, W.S. and Ye, Y, 2017. Model research and open sea tests of 100 kW wave energy convertor Sharp Eagle Wanshan, Renewable Energy, 113, 587–595.

    Article  Google Scholar 

  • Sheng, S.W., Zhang, Y.Q., Wang, K.L., Wang, Z.P., Lin, H.J. and Ye, Y, 2015. Research on wave energy converter Sharp Eagle I, Ship Engineering, 37(9), 104–108. (in Chinese)

    Google Scholar 

  • Wang, L., Isberg, J. and Tedeschi, E., 2018. Review of control strategies for wave energy conversion systems and their validation: the wave-to-wire approach, Renewable and Sustainable Energy Reviews, 81, 366–379.

    Article  Google Scholar 

  • Zhang, Y.Q., Sheng, S.W., You, Y.G., Huang, Z.X. and Wang, W.S., 2017. Study of hydrodynamic characteristics of a Sharp Eagle wave energy converter, China Ocean Engineering, 31(3), 364–369.

    Article  Google Scholar 

  • Zheng, C.W. and Li, C.Y., 2016. Review on the global ocean wave energy resource, Marine Forecasts, 33(3), 76–88. (in Chinese)

    Google Scholar 

Download references

Author information

Authors and Affiliations


Corresponding author

Correspondence to Yin Ye.

Additional information

Foundation item: This work was financially supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA13040202) and the Special Funding Program for Marine Renewable Energy of the State Oceanic Administration (Grant No. GHME2017SF01).

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Ye, Y., Wang, Kl., You, Yg. et al. Research of Power Take-off System for “Sharp Eagle II” Wave Energy Converter. China Ocean Eng 33, 618–627 (2019).

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI:

Key words

  • Sharp Eagle
  • Wave Energy Converter
  • power take-off power generation mode
  • hydraulic system