Discrete Near-Optimal Wave Disturbances Rejection Control for Offshore Platforms With Delays in Measurement and Actuator | Zendy

Yong-Zheng Lin | Zendy; Hong Liu | Zendy; Zhen-Xiang Chen | Zendy

Open Access

Discrete Near-Optimal Wave Disturbances Rejection Control for Offshore Platforms With Delays in Measurement and Actuator

Author(s) -

Yong-Zheng Lin,

Hong Liu,

Zhen-Xiang Chen

Publication year - 2018

Publication title -

ieee access

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.587

H-Index - 127

ISSN - 2169-3536

DOI - 10.1109/access.2018.2866908

Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation

The wave disturbances rejection control problem for linear discrete jacket-type offshore platforms with delays in measurement and actuator is studied. Taken the delays in measurement and actuator into account, the linear model of the jacket-type offshore platform is established in discrete domain, in which the external wave forces are generated from a designed exosystem based on the JONSWAP wave spectrum and linearized wave theory. A delay-free model from the model of the jacket-type offshore platform with delays in measurement and actuator is formulated based on a designed discrete transformation vector, and the system output with delays in measurement is reformed into a corresponding delay-free form. Then, the discrete near-optimal wave disturbances rejection controller (NOWDRC) is derived from the reformed delay-free system and the corresponding system output in respect of an average quadratic performance index, which is made up of a system state feedback item, a wave disturbances feedforward item and a controller memory item. Finally, simulation results demonstrate that the system output under proposed NOWDRC, including the displacement and velocity of the jacket-type offshore platform, can be offset to smaller values than those under a classic feedback optimal vibration controller, and the delays in measurement and actuator can be compensated effectively.

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