College of Automation Engineering, Nanjing University of Posts and Telecommunications
An effective wide band active control law through one kind of the Dynamic Vibration Absorber (DVA) is proposed and studied in this paper. With the help of mechanical impedance method, active DVA control law is formulated based on the passive mechanical model. The electrical DVA can generate multi-mode active damping to the structure. The host structure is an aluminum plate and acceleration signal is feedback through the controller to a collocated piezoelectric actuator. Experimental systems are setup and the open loop analysis shows that the control system has better roll-off property than the Direct Velocity Feedback (DVF) controller does. Furthermore, real time control results demonstrate that the multiple vibration modes can be suppressed simultaneously. Meanwhile, the measured sound isolation performance below 1 kHz can be up to 6 dB. The proposed method is simple and effective, which is applicable to other types of structures.