Vibration Abatement Design for a Marine Riser System

The main work of this paper is the oscillation control issue of variable length drilling riser system under unknown disturbances. By integrating the technique of finite-dimensional backstepping with boundary control scheme, a suitable boundary control is raised. And for coping with boundary disturbance, a disturbance observer is devised at the same lime. The uniformly bounded stability of the closed-loop drilling riser system is achieved. By numerical simulations, the effect of the control scheme raised is proved.