An acoustic absorber implemented by graded index phononic crystals

Yu Jui Liang, Lien Wen Chen, Ching Cheng Wang, I. Ling Chang

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


In this paper, we proposed the implementation of a two-dimensional omnidirectional and broadband acoustic absorber using graded index phononic crystals as the shell with an inner absorbing core. The phononic crystal was consisted of circular steel rod arranged as square lattice in air background. The plane wave expansion method was used to obtain the band diagram of the phononic crystal from which the effective refractive index could be computed. The radially distributed refractive index of the acoustic absorber was achieved by placing steel rods with spatially varying radii. The finite element method was employed in order to confirm the acoustic properties of the designed device. Numerical simulations illustrated that the acoustic waves were bent toward the central area by the outer shell and absorbed by the inner core of the implemented acoustic absorber. Furthermore, it was demonstrated that the implemented acoustic absorber could operate independent of the incident wave directions for a relative wide range of frequencies.

Original languageEnglish
Article number244513
JournalJournal of Applied Physics
Issue number24
Publication statusPublished - 2014 Jun 28

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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