Low-frequency Gibbs-type oscillation in finite solid-fluid sonic crystals and its application in sub-wavelength wave isolation for waterborne sound

Wei Lu, Chen Guang Xu, Sai Zhang, Bai Qiang Xu, Wenwu Cao

Research output: Contribution to journalArticle

Abstract

Blocking underwater sound waves using sub-wavelength structures, i.e. with the unit size much smaller than the incident wavelength, is a known challenge and highly desirable in practical applications. In this work, we show that this can be easily achieved utilizing the Gibbs-type oscillation properties of finite solid-fluid sonic crystals (SFSCs). First, the influence of solid parameters and the period number of SFSC on the Gibbs-type oscillation within the first Bragg passband is comprehensively investigated. Based on this, isolations with periodic cells of sub-wavelength size are designed and numerically demonstrated through finite element simulations. The results show that the broadband underwater sound blocking effect does exist in a finite SFSC whose total thickness is only one quarter of the incident wavelength, while a very low transmittance of less 1% is achieved. Our work will provide a new approach to control low-frequency underwater sound waves using Bragg sonic crystals.

Original languageEnglish (US)
Article number505114
JournalJournal of Physics D: Applied Physics
Volume52
Issue number50
DOIs
StatePublished - Oct 9 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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