Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61937
Title: Loss of acoustic black hole effect in a structure of finite size
Authors: Tang, L
Cheng, L 
Issue Date: 2016
Publisher: American Institute of Physics
Source: Applied physics letters, 2016, v. 109, no. 1, 014102 How to cite?
Journal: Applied physics letters 
Abstract: The Acoustic Black Hole (ABH) effect takes place in thin-walled structures with diminishing thickness as a result of the reduction in the bending wave speed. It was shown to exist as a broadband phenomenon, based on wave propagation theory in structures of semi-infinite size. The ABH effect exhibits appealing features for various applications, such as passive vibration control, energy harvesting, and sound radiation control. In this paper, we demonstrate the disappearance of the ABH effect in a finite beam at specific frequency ranges above the cut-on frequency, both experimentally and theoretically. Analyses show that the phenomenon takes place at frequencies which are close to the low order local resonant frequencies of the portion of the beam demarcated by the position of the excitation force. These frequencies can be predicted so that the phenomenon can be avoided for the targeted frequency ranges in ABH applications.
URI: http://hdl.handle.net/10397/61937
ISSN: 0003-6951
EISSN: 1077-3118
DOI: 10.1063/1.4955127
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