An alternative acoustic black hole thickness profile for enhanced structural damping in a plate

Li Ma, Li Cheng

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Owing to the unique wave retarding feature, Acoustic Black Hole (ABH) structures with a standard power-law thickness profile have been extensively investigated for various applications in structural vibration and sound radiation mitigation. As an attempt to achieve the best possible ABH effects under a prescribed minimum thickness, this paper reports an alternative ABH thickness profile. Employing the previously developed semi-analytical Daubechies wavelet plate model, a new ABH profile is obtained through a systematic optimization approach. The new profile features a thickness variation which is different from the standard one. Specifically, the thinnest part of the optimized profile is off-set from the indentation centre, thus forming a ring-shaped flexible area, which is shown to be conducive to energy focalization and dissipation with the deployment of a damping layer. The new profile promotes the formation of local (n-, 1) and (n-, 2) modes which entails damping increase, alongside a bi-directional wave trapping process, both within the ring-shaped area. As a result, a significant increase in the system damping and a reduction in the structural vibration and sound radiation are observed.

Original languageEnglish
Title of host publicationProceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020
EditorsJin Yong Jeon
PublisherKorean Society of Noise and Vibration Engineering
ISBN (Electronic)9788994021362
Publication statusPublished - 23 Aug 2020
Event49th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2020 - Seoul, Korea, Republic of
Duration: 23 Aug 202026 Aug 2020

Publication series

NameProceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020

Conference

Conference49th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2020
CountryKorea, Republic of
CitySeoul
Period23/08/2026/08/20

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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