Composite vibration control for a stiffened panel structure using acceleration feedback and active disturbance rejection

There are a variety of uncertainties in the all-clamped stiffened panel structure, e.g., model uncertainty, which can affect the vibration control performance of the closed-loop structure. A kind of linear composite active vibration control strategy combining a second order active disturbance rejection controller (ADRC) with an acceleration feedback controller is designed, which is independent of the mathematical model of the structure. And the stability and superiority of the strategy are analyzed theoretically. Firstly, the estimation of the generalized disturbances including the variations of the structure model and the external disturbances were real-time performed by a second order linear active disturbance rejection controller, and it was fed forwards to the control as the compensated signal to reject the effect caused by these disturbances. Secondly, a kind of composite vibration controller based on the feedback of acceleration and linear state error signals was designed. Finally, in order to verify the proposed composite controller, using dSPACE real-time simulation system an experimental platform of active vibration control for the all-clamped stiffened panel structure was built. Acceleration sensor and piezoelectric actuator were used and comparison tests were conducted for the proposed control method. The experiment results under several disturbance excitations demonstrate that the proposed vibration control strategy not only effectively suppresses the vibration excited by sinusoidal and impulsive disturbances, but also diminish the fluctuation effects caused by uncertain factors.