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Vibration boundary control of a flexible marine riser with high-gain observer

This paper investigates vibration control problem of a flexible marine riser coupled with the internal fluid dynamics. By applying Lyapunov's direct method, boundary control technique and high-gain observers, an output feedback boundary control is proposed to suppress the vibration of the riser system. With the proposed control, the control spillover is avoided and the stability of the closed-loop system and uniform boundedness of the closed-loop signals are ensured. Simulation results validate the effectiveness of the proposed control.