Active vibration control of marine riser

Abstract

This paper presents an active vibration control strategy in order to prevent resonance occurrence in marine offshore vertical riser pipe. Experimental data collected by previous research are used as an input - output data for system identification. Both Least Squares (LS) and Recursive Least Squares (RLS) methods are employed to model the dynamic response of the riser pipe at a particular speed. An auto-tuned PID controller algorithm is developed and implemented for suppression of the riser pipe's vibration. The research revealed the superiority of RLS in modeling the system with the lowest mean squared error of 0.0062. Later, the transfer function obtained by RLS identification technique was utilized within Matlab SIMULINK environment for development of the PID active vibration controller (PID - AVC) using Iterative Learning Algorithm (ILA). The iterative learning PID - AVC controller's capability in suppressing the vortex induced vibration for marine riser and its robustness was tested, verified and proven.