Study on vibro-acoustic characteristics of an adaptive piezoelectric locally resonant structure

Adaptively reducing low-frequency broadband vibration and noise is a challenge in the engineering and needs to be resolved. A piezoelectric locally resonant structure with periodic piezoelectric units and shunt damping circuits of synthetic impedance was studied to provide an option to deal with the problem. The z-scores method was applied to identify the peak frequencies used in the setting of control parameters. The band-gap performance and vibro-acoustic response were analyzed based on the plane wave expansion method and finite element method, respectively. The results show that the considered locally resonant piezoelectric structure with the z-scores peak-detection method can adaptively suppress the vibration and acoustic radiation of the plate, providing an effective method to reduce vibration and noise in time-varying excitation situations.