Compact and Efficient Active Vibro-acoustic Control of a Smart Plate Structure

An effective wide-band, active control law based on a type of Dynamic Vibration Absorber (DVA) was proposed and investigated in this study. Using the mechanical impedance method, an active DVA control law was formulated based on the passive mechanical model. The resulting electrical DVA was capable of generating multi-mode active damping to its attentive structure. The host structure was an aluminum plate with an acceleration signal fed back through the controller to a collocated piezoelectric actuator. An experimental system was constructed employing the DVA and an open loop analysis showed that the control system had better a roll-off property than the Direct Velocity Feedback (DVF) controller. Furthermore, real time control results demonstrated that the multiple vibration modes can be simultaneously suppressed. In addition, the measured sound isolation performance below 1 kHz was found to be as high as 6 dB. The proposed method is simple and effective and is readily applicable to a variety of structures.