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Energies 2017, 10(12), 1997; https://doi.org/10.3390/en10121997

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

1
School of Information Technology, Shandong Women’s University, Jinan 250300, China
2
Shandong Provincial Key Laboratory of Network Based Intelligent Computing, University of Jinan, Jinan 250022, China
*
Author to whom correspondence should be addressed.
Received: 20 October 2017 / Revised: 9 November 2017 / Accepted: 22 November 2017 / Published: 1 December 2017
(This article belongs to the Special Issue Marine Energy)
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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. View Full-Text
Keywords: nonlinear offshore platform; digital control; nonlinear compensated component; disturbance attenuation; irregular wave force nonlinear offshore platform; digital control; nonlinear compensated component; disturbance attenuation; irregular wave force
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Zhong, X.-F.; Sun, Y.-H.; Han, S.-Y.; Zhou, J.; Wang, D. Digital-Control-Based Approximation of Optimal Wave Disturbances Attenuation for Nonlinear Offshore Platforms. Energies 2017, 10, 1997.

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