Grazing incidence modeling of a metamaterial-inspired dual-resonance acoustic liner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

To reduce the noise emitted by commercial aircraft turbofan engines, the inlet and aft nacelle ducts are lined with acoustic absorbing structures called acoustic liners. Traditionally, these structures consist of a perforated facesheet bonded on top of a honeycomb core. These traditional perforate over honeycomb core (POHC) liners create an absorption spectra where the maximum absorption occurs at a frequency that is dictated by the depth of the honeycomb core; which acts as a quarter-wave resonator. Recent advances in turbofan engine design have increased the need for thin acoustic liners that are effective at low frequencies. One design that has been developed uses an acoustic metamaterial architecture to improve the low frequency absorption. Specifically, the liner consists of an array of Helmholtz resonators separated by quarter-wave volumes to create a dual-resonance acoustic liner. While previous work investigated the acoustic behavior under normal incidence, this paper outlines the modeling and predicted transmission loss and absorption of a dual-resonance acoustic metamaterial when subjected to grazing incidence sound.

Original languageEnglish (US)
Title of host publicationHealth Monitoring of Structural and Biological Systems 2014
PublisherSPIE
ISBN (Print)9780819499905
DOIs
StatePublished - Jan 1 2014
EventHealth Monitoring of Structural and Biological Systems 2014 - San Diego, CA, United States
Duration: Mar 10 2014Mar 13 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9064
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherHealth Monitoring of Structural and Biological Systems 2014
CountryUnited States
CitySan Diego, CA
Period3/10/143/13/14

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Beck, B. S. (2014). Grazing incidence modeling of a metamaterial-inspired dual-resonance acoustic liner. In Health Monitoring of Structural and Biological Systems 2014 [906421] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9064). SPIE. https://doi.org/10.1117/12.2059834