Directional wave propagation in thin plates with periodic two-dimensional imperfect acoustic black holes

Bing Han, Hongli Ji, Jinhao Qiu, Yipeng Wu, Chao Zhang, Li Cheng

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

Abstract

Acoustic black hole (ABH) structures have been developed as a new approach for manipulating flexural wave propagation in plate and beam structures. To overcome the limitation of single ABH cell on manipulating wave propagation as the results of the coupling between the size of ABH cell and wave length, this work investigates a thin plate with periodic array of two-dimensional (2D) imperfect ABH structures for wave manipulation. Dispersion relations and eigenstates of an infinite periodic lattice structure, which is consisted of a square array of imperfect ABH indentations, are numerically investigated. Both of them are shown to be different from those of the infinite periodic lattice structure based on traditional ABH structure. The results show that the considered periodic lattice structure based on a generally power-law-profiled indentation can generate remarkable dispersion relations. Additional insight on wave manipulation properties of these periodic lattice structures is analysed by using steady state distributions of wave field in thin plates coupled with these periodic lattice structures. The distributions of wave field demonstrate some special field patterns: wave front reshaping and directional wave propagation.

Original languageEnglish
Title of host publication25th International Congress on Sound and Vibration 2018, ICSV 2018
Subtitle of host publicationHiroshima Calling
PublisherInternational Institute of Acoustics and Vibration, IIAV
Pages2363-2370
Number of pages8
ISBN (Electronic)9781510868458
Publication statusPublished - 1 Jan 2018
Event25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018 - Hiroshima, Japan
Duration: 8 Jul 201812 Jul 2018

Publication series

Name25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling
Volume4

Conference

Conference25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018
Country/TerritoryJapan
CityHiroshima
Period8/07/1812/07/18

Keywords

  • Acoustic black hole
  • Dispersion relations
  • Periodic array
  • Wave field

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this