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Digital-Control-Based Approximation of Optimal Wave Disturbances Attenuation for Nonlinear Offshore Platforms

Author

Listed:
  • Xiao-Fang Zhong

    (School of Information Technology, Shandong Women’s University, Jinan 250300, China)

  • Yu-Hong Sun

    (School of Information Technology, Shandong Women’s University, Jinan 250300, China)

  • Shi-Yuan Han

    (Shandong Provincial Key Laboratory of Network Based Intelligent Computing, University of Jinan, Jinan 250022, China)

  • Jin Zhou

    (Shandong Provincial Key Laboratory of Network Based Intelligent Computing, University of Jinan, Jinan 250022, China)

  • Dong Wang

    (Shandong Provincial Key Laboratory of Network Based Intelligent Computing, University of Jinan, Jinan 250022, China)

Abstract

The irregular wave disturbance attenuation problem for jacket-type offshore platforms involving the nonlinear characteristics is studied. The main contribution is that a digital-control-based approximation of optimal wave disturbances attenuation controller (AOWDAC) is proposed based on iteration control theory, which consists of a feedback item of offshore state, a feedforward item of wave force and a nonlinear compensated component with iterative sequences. More specifically, by discussing the discrete model of nonlinear offshore platform subject to wave forces generated from the Joint North Sea Wave Project (JONSWAP) wave spectrum and linearized wave theory, the original wave disturbances attenuation problem is formulated as the nonlinear two-point-boundary-value (TPBV) problem. By introducing two vector sequences of system states and nonlinear compensated item, the solution of introduced nonlinear TPBV problem is obtained. Then, a numerical algorithm is designed to realize the feasibility of AOWDAC based on the deviation of performance index between the adjacent iteration processes. Finally, applied the proposed AOWDAC to a jacket-type offshore platform in Bohai Bay, the vibration amplitudes of the displacement and the velocity, and the required energy consumption can be reduced significantly.

Suggested Citation

  • Xiao-Fang Zhong & Yu-Hong Sun & Shi-Yuan Han & Jin Zhou & Dong Wang, 2017. "Digital-Control-Based Approximation of Optimal Wave Disturbances Attenuation for Nonlinear Offshore Platforms," Energies, MDPI, vol. 10(12), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:12:p:1997-:d:121171
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    Cited by:

    1. Leszek Chybowski & Zenon Grządziel & Katarzyna Gawdzińska, 2018. "Simulation and Experimental Studies of a Multi-Tubular Floating Sea Wave Damper," Energies, MDPI, vol. 11(4), pages 1-20, April.

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