Robust sampled-data H∞ control for offshore platforms subject to irregular wave forces and actuator saturation

• Published in: Nonlinear dynamics Vol. 88; no. 4; pp. 2705 - 2721
• Main Authors: Huang, Shipei, Cai, Mingjie, Xiang, Zhengrong
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.06.2017; Springer Nature B.V
• Subjects: Actuators; Automotive Engineering; Classical Mechanics; Computer simulation; Control; Control systems design; Digital computers; Dynamical Systems; Engineering; H-infinity control; Mechanical Engineering; Offshore drilling rigs; Offshore platforms; Original Paper; Robust control; Saturation; Vibration; Vibration control; Wave attenuation; Wave forces; Sampled-data control; Vibration control; control; Offshore platforms; Actuator saturation
• ISSN: 0924-090X; 1573-269X
• DOI: 10.1007/s11071-017-3404-6

This paper presents a robust sampled-data H ∞ control scheme for vibration attenuation of offshore platforms subject to irregular wave forces and actuator saturation. When a digital computer is used to sample and quantize the measurement signal, a discrete-time control input signal will be produced. At the same time, the actuator is usually saturated due to the physical or technological constraints. In view of these, a sampled-data H ∞ controller is designed to attenuate the wave-induced vibration of the offshore platform, thereby improving the control performance of the system. It is shown through simulation results that the proposed control scheme is effective to suppress the vibration of the offshore platform in the presence of actuator saturation.