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Observer-based backstepping boundary control for a flexible riser system
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DOI：10.1016/j.ymssp.2018.03.058.png)
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Abstract
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In order to achieve the disturbance rejection and vibration abatement of a flexible marine riser system, this article discusses the design of disturbance observers and controller. The riser system subjected to external disturbances is a distributed parameter system in essence and represented by infinite-dimensional equation coupled with finite-dimensional equations. In addition to designing a basic boundary disturbance observer to deal with the time-varying boundary disturbance in this paper, an innovative infinite dimensional disturbance observer is also designed to compensate for the spatially distributed disturbance. Applying these two observers as feedforward compensators, an observer-based boundary controller is formulated by means of combining backstepping technique with boundary control method. Moreover, the well-posedness of the closed-loop riser system is discussed, and simulations are presented to display the effectiveness of formulated control approach. (C) 2018 Elsevier Ltd. All rights reserved.
Keywords:
Flexible riser
Backstepping technique
Infinite dimensional disturbance observer
Boundary control
Well-posedness
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