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

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

Content Provider	MDPI
Author	Zhong, Xiao-Fang Sun, Yu-Hong Han, Shi-Yuan Zhou, Jin Wang, Dong
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.
File Size	871424
File Format	PDF
e-ISSN	19961073
DOI	10.3390/en10121997
Journal	Energies
Issue Number	12
Volume Number	10
Language	English
Publisher Date	2017-12-01
Access Restriction	Open
Subject Keyword	nonlinear offshore platform digital control nonlinear compensated component disturbance attenuation irregular wave force
Content Type	Text
Resource Type	Article

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