Studies on Influence of Geometrical Parameters of an Acoustic Black Hole

Vibrating structures is one of the primary sound sources. Engineers have made their effort to develop various of methods to control the sound radiation from vibration structures, thereby reducing the noise. Recently, Acoustic Black Holes (ABH), a new passive structural modification approach to control vibration and noise from mechanical structures has been developed and studied. An ABH is usually a power-law taper profile due to which the wave velocity gradually reduces to zero. Also, the vibration energy is concentrated at the locations of ABH due to the reduction of wavelength. The exponent and parameter of the power-law curve influences the geometry of an ABH. The purpose of this work is to investigate the influence of the geometry of ABH on the sound radiation from vibrating structures. This paper presents the numerical and experimental work on the influence of ABH on the sound fields of vibrating cantilever beams.