Vibration cancellation effectiveness using a second order piezoelectric actuator model

It is shown that it is feasible to use a piezoelectric actuator that is bonded to a vibrating surface in order to produce a nonvibrating composite surface. The proposed feedback system for vibration cancellation employs multiplying DACs (digital to analog converters) to realize digital control of analog compensation circuitry. The equivalent electronic model for the piezoactuator is presented along with a description and analysis of the vibration cancellation circuitry. Cancellation effectiveness of the feedback system that uses a Sallen and Key circuit to simulate the piezoactuator is experimentally determined as a function of frequency for piezoactuator quality factors ranging from .5 to 5. Utilizing digital control, a 40 dB reduction of the input disturbance at the resonant frequency of the piezoactuator model has been achieved for Q=5