Dead Zone Compensation and Adaptive Vibration Control of Uncertain Spatial Flexible Riser Systems

• Published in: IEEE/ASME transactions on mechatronics Vol. 25; no. 3; pp. 1398 - 1408
• Main Authors: Zhao, Zhijia, Ahn, Choon Ki, Li, Han-Xiong
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive control; Adaptive systems; Boundary control; Compensation; Control stability; Design parameters; flexible risers; IEEE transactions; input dead zone; Mechatronics; Nonlinearity; robust adaptive control; Robust control; Uncertainty; Upgrading; Vibration control; Vibrations
• ISSN: 1083-4435; 1941-014X
• DOI: 10.1109/TMECH.2020.2975567

This article provides a framework of dead zone compensation and robust adaptive vibration control for uncertain spatial flexible riser systems. First, nonsymmetric dead zone nonlinearity is represented in the form of the desired control input with the addition of an extra nonlinear input error. Second, by visualizing those input errors and extrinsic disturbances as an unknown "disturbance-like" term, a new robust adaptive vibration control technology and online updating laws can be constructed for riser systems to guarantee the oscillation reduction and compensation of uncertainties and dead zone. Third, the constructed control ensures and achieves bounded Lyapunov stability in the controlled system. Ultimately, control performances are demonstrated with appropriate design parameters.