Effects of porous covering on sound attenuation by periodic arrays of cylinders.

Umnova, O; Attenborough, CM; Linton, J

Abstract

The acoustic transmission loss of a finite periodic array of long rigid cylinders, without and with porous absorbent covering, is studied both theoretically and in the laboratory. A multiple scattering model is extended to allow for the covering and its acoustical properties are described by a single parameter semi-empirical model. Data from laboratory measurements and numerical results are found to be in reasonable agreement. These data and predictions show that porous covering reduces the variation of transmission loss with frequency due to the stop/pass band structure observed with an array of rigid cylinders with similar overall radius and improves the overall attenuation in the higher frequency range. The predicted sensitivities to covering thickness and effective flow resistivity are explored. It is predicted that a random covered array also gives better attenuation than a random array of rigid cylinders with the same overall radius and volume fraction.

Citation

Umnova, O., Attenborough, C., & Linton, J. (2006). Effects of porous covering on sound attenuation by periodic arrays of cylinders. ˜The œJournal of the Acoustical Society of America (Online), 119(1), 278-284. https://doi.org/10.1121/1.2133715

• Journal Article Type: Article
• Publication Date: Jan 1, 2006
• Deposit Date: Oct 3, 2007
• Journal: The Journal of the Acoustical Society of America (JASA)
• Print ISSN: 0001-4966
• Peer Reviewed: Peer Reviewed
• Volume: 119
• Issue: 1
• Pages: 278-284
• DOI: https://doi.org/10.1121/1.2133715