0

Full Content is available to subscribers

Subscribe/Learn More  >

Broadening the Bandgaps of Sonic Crystals by Varying Shapes, Sizes and Orientations of the Scatterers

[+] Author Affiliations
Debasish Panda, A. R. Mohanty

IIT Kharagpur, Kharagpur, India

Paper No. IMECE2018-87398, pp. V011T01A013; 9 pages
doi:10.1115/IMECE2018-87398
From:
  • ASME 2018 International Mechanical Engineering Congress and Exposition
  • Volume 11: Acoustics, Vibration, and Phononics
  • Pittsburgh, Pennsylvania, USA, November 9–15, 2018
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5216-3
  • Copyright © 2018 by ASME

abstract

Sonic Crystals are noise barriers wherein the incident sound waves are scattered multiple times by the periodically arranged scatterers placed inside a host fluid. Used as sound attenuators, sonic crystals attenuate sound over frequency bands known as bandgaps. Broadening and lowering the bandgaps is the primary objective of this work. Effect of changing the shape, size and orientations of the scatterers on the band characteristics have been reported here. Different shapes of the scatterers are found to affect the band characteristics of the sonic crystals. Adding local resonance to the scatterers introduce a new attenuation mechanism due to local acoustic resonances. A new type of double circle split-ring resonator is also proposed which use acoustic resonance to produce additional bandgaps. Size and orientation of the scatterers are also found to affect the bandwidth and center frequency of the bandgaps. The band diagram, transmission loss, eigenmodes are computed using finite element method. COMSOL Multiphysics, a commercially available finite element software has been used to implement FEM and model the two-dimensional unit cells and the sonic crystal arrays. Due to the large difference in impedance of the steel scatterer embedded in air, the scatterers are assumed to be sound hard (sound rigid) which imposes a condition where normal component of acceleration is zero.

Copyright © 2018 by ASME
Topics: Crystals , Energy gap , Shapes

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In