A refined disturbance rejection control for vibration suppression of smart structures under unknown disturbances

Abstract

Vibrations are usually caused by continuous disturbances with large amplitudes. Different from other control methods, disturbance rejection control is a potential method, which considers the unknown disturbances in the control design. To remedy the shortcomings of the existing disturbance rejection control in the vibration reduction of structures especially under high-frequency periodic disturbances, this paper aims to improve the control ability of the current disturbance rejection control for the vibration suppression of smart structures under any unknown periodic disturbances with high-order frequency or random disturbances varying fast. Afterwards, the refined disturbance rejection control is compared with the previously designed disturbance rejection control with proportional–integral observer and disturbance rejection control with generalized proportional–integral observer on both theoretical and numerical levels.