Influence of Structural Form on the Acoustic Black Hole Array Coupled with Damping Layers

Abstract

Because of the characteristics of manipulating bending wave, acoustic black hole (ABH) structures can efficiently concentrate vibration energy in the center. Other than single ABH structures, the ABH array or damping layers can be used to have a better performance in vibration reduction and noise control, which have great engineering application prospects of plate parts. In order to explore the influences of ABH array on vibration and noise reduction, finite element models of two-dimensional ABH array coupled with damping layers were established in this paper to study the effects of arrangements and number of ABH cells on dynamic characteristics. Firstly, this paper analyses the influences of array embedded with three ABH cells on the modal loss factor and vibration characteristics of the structures as well as the effects of different arrangements. Secondly, the array with different number of ABH cells were established to study the effects of the number of elements on the vibration response of the plate. Finally, the structure-sound coupling models were established to study the acoustic radiation characteristics and explain the noise response of the array plate. This study provides a reference for the design and application of the plates embedded with ABH array.