Paper Info
Title
State Constrained Variable Structure Control for Active Heave Compensators
Abstract
Heave compensation systems are widely used to decouple the load motion from wave-induced vessel motion for the equipment handling on the ocean. Researches have been made to achieve successful compensation, yet few of them discusses the inherent constraints of the systems, such as bounded compensator's stroke and max actuator's velocity. This paper presents a solution for active heave compensation systems with such constraints by means of variable structure control. The controller's complexity on design procedures and effectiveness are compared with a trajectory planning control method which turns out that the variable structure controller is more suitable to apply to the active heave compensators. The back-stepping method is used to robustly stabilize this variable structure system and for the aim of a decrease on the high robust gain due to uncertain friction term, a modified decoupled friction observer is used which is also verified by both theoretical and experimental analyses. To compensate for the time delay of the motion reference unit (MRU), a heave prediction algorithm is used. The experimental results show that most heave motion can be compensated when the motion and its velocity are feasible, while no hit occurs otherwise.
Year
DOI
Venue
2019
10.1109/ACCESS.2019.2907674
IEEE ACCESS
Keywords
Field
DocType
Heave compensation,nonlinear state constrained control,variable structure system,heave prediction,nonlinear friction observer
Control theory,Control theory,Computer science,Active heave compensation,Observer (quantum physics),Variable structure system,Variable structure control,Trajectory planning,Distributed computing,Actuator,Bounded function
Journal
Volume
ISSN
Citations 
7
2169-3536
0
PageRank 
References 
Authors
0.34
0
5
Name
Order
Citations
PageRank
Huan Yu14613.63
Ying Chen23613.36
Wenzhuo Shi312.40
Yi Xiong411811.15
Jianhua Wei596.49