Passive control of vibrations using Acoustic Black Holes

Adrien Pelat, François Gautier, Fabio Semperlotti, Stephen Clarke Conlon

Research output: Contribution to conferencePaper

1 Scopus citations

Abstract

An Acoustic Black Hole embedded in a thin walled structure consists in a tapered indentation of power-law profile, covered by a thin visco-elastic layer. Such local variations of the bending stiffness and surface density leads to a gradually decreasing phase velocity and a gradually increasing local loss factor towards the ABH center. It is shown that such an Acoustic Black Hole is an efficient vibration damper. The number of papers studying this device is growing since the first works on this field in the 1980's. These papers show that several properties are usually observed in an ABH : Low reflection coefficient, localised vibration, trapped modes, cut-off frequeny. The aim of this paper is to provide a state of the art on these properties and to illustrate them by presenting modelling and experimental characterization of different classes of 1D (beam) and 2D (plate) configurations. For this purpose, investigations are performed on a collection of 1D and 2D ABH of various types; 1D ABH with varying thickness only, 1D ABH with varying thickness and width, non linear 1D ABH, 1D ABH with local defects, slots, circular 2D ABH with and without central hole, circular 2D ABH with and without central masses, periodic lattice of 2D ABH embedded on a flat panel. The capability of these different configurations to damp vibrations is discussed.

Original languageEnglish (US)
StatePublished - Jan 1 2017
Event46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017 - Hong Kong, China
Duration: Aug 27 2017Aug 30 2017

Other

Other46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017
CountryChina
CityHong Kong
Period8/27/178/30/17

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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    Pelat, A., Gautier, F., Semperlotti, F., & Conlon, S. C. (2017). Passive control of vibrations using Acoustic Black Holes. Paper presented at 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017, Hong Kong, China.