Enhancing the low frequency vibration reduction performance of plates with embedded Acoustic Black Holes

Stephen C. Conlon, John B. Fahnline, Fabio Semperlotti, Philip A. Feurtado

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

Embedded Acoustic Black Holes (ABH) have been investigated as a passive treatment for noise and vibration control. The ABH effect is produced from a plate thickness power taper which results in a local asymptotic reduction of wave speed within the ABH. Theoretically the local wave speed approaches zero at the ABH center, causing the waves to take an infinite amount of time to reach the center, thus the waves are "trapped" in the black hole. This work focused on the low frequency performance of plates with periodic grids of ABHs for structural vibration and radiated sound reduction. Plates with embedded ABH grids were modeled with detailed Finite / Boundary Element models. The results show the ABHs reduce the narrow band vibration and radiated sound power by up to approximately 20 dB or more over that of the heavier uniform panel, at frequencies below the theoretical cut-on of the ABH as a broadband absorber. The low frequency performance of the ABH grids can be tailored based on the low frequency vibration characteristics of the ABH unit cell. Detailed results for several ABH plate configurations are presented giving insight into key ABH low frequency design performance characteristics.

Original languageEnglish (US)
Title of host publicationINTERNOISE 2014 - 43rd International Congress on Noise Control Engineering
Subtitle of host publicationImproving the World Through Noise Control
EditorsJohn Davy, Marion Burgess, Charles Don, Liz Dowsett, Terry McMinn, Norm Broner
PublisherAustralian Acoustical Society
ISBN (Electronic)9780909882037
StatePublished - Jan 1 2014
Event43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control, INTERNOISE 2014 - Melbourne, Australia
Duration: Nov 16 2014Nov 19 2014

Publication series

NameINTERNOISE 2014 - 43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control

Other

Other43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control, INTERNOISE 2014
CountryAustralia
CityMelbourne
Period11/16/1411/19/14

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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