Flexural wave focalization in plates with imperfect two-dimensional acoustic black hole

Wei Huang, Hongli Ji, Jinhao Qiu, Li Cheng

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

4 Citations (Scopus)

Abstract

Acoustic Black Hole (ABH) in thin-walled structures has been proved remarkably useful for broadband flexural wave focalization, in which the thickness profile or refractive index of the media gradually changes in the non-uniform part. Due to the extremely thin thickness of the indentation area, the ideal ABH effect will adversely be affected by geometrical and manufacturing uncertainties. This paper presents a plate-like structure with different tailored power-law-profiled indentations called imperfect two-dimensional ABH structures. With the new indentation profile, similar energy focalization phenomenon as the conventional ABH structure is produced on one hand; on the other hand, the stringent power-law thickness variation in ideal ABH structures can be relaxed, thus overcoming the structural problems of the ideal ABH structures to a certain extent. Numerical simulations were carried out to clarify the energy focalization phenomenon, the underlying physics as well as the evolution process of energy focalization in the non-uniform part in time domain. Finally, experiments were performed by using the laser ultrasonic scanning technique, which reconstructs the acoustic wave field in the whole area and validates the phenomenon of flexural wave focalization revealed in numerical simulations.
Original languageEnglish
Title of host publicationProceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future
PublisherGerman Acoustical Society (DEGA)
Pages2392-2402
Number of pages11
Publication statusPublished - 21 Aug 2016
Event45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016 - Hamburg, Germany
Duration: 21 Aug 201624 Aug 2016

Conference

Conference45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016
Country/TerritoryGermany
CityHamburg
Period21/08/1624/08/16

Keywords

  • Acoustic black hole
  • Flexural wave focalization

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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