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Title: Loss of acoustic black hole effect in a structure of finite size

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.

Authors:
;  [1]
  1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon (Hong Kong)
Publication Date:
OSTI Identifier:
22590638
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 1; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BEAMS; CONTROL; EXCITATION; FREQUENCY RANGE; HARVESTING; LOSSES; SOUND WAVES; THICKNESS; VELOCITY; WALLS; WAVE PROPAGATION

Citation Formats

Tang, Liling, and Cheng, Li, E-mail: li.cheng@polyu.edu.hk. Loss of acoustic black hole effect in a structure of finite size. United States: N. p., 2016. Web. doi:10.1063/1.4955127.
Tang, Liling, & Cheng, Li, E-mail: li.cheng@polyu.edu.hk. Loss of acoustic black hole effect in a structure of finite size. United States. doi:10.1063/1.4955127.
Tang, Liling, and Cheng, Li, E-mail: li.cheng@polyu.edu.hk. Mon . "Loss of acoustic black hole effect in a structure of finite size". United States. doi:10.1063/1.4955127.
@article{osti_22590638,
title = {Loss of acoustic black hole effect in a structure of finite size},
author = {Tang, Liling and Cheng, Li, E-mail: li.cheng@polyu.edu.hk},
abstractNote = {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.},
doi = {10.1063/1.4955127},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 1,
volume = 109,
place = {United States},
year = {2016},
month = {7}
}