Experimental investigation of the bulk reaction boundary condition

Journal Article (Journal Article)

A local boundary condition to account for the effect of bulk reaction on the performance of sound absorbing layers was proposed by D. Bliss [J. Acoust. Soc. Am. 71, 533–545 (1982)]. The new boundary condition differs from the usual impedance boundary condition by the inclusion of an additional term involving the Laplacian of pressure taken along the surface multiplied by a complex bulk reaction coefficient, B(w). The present work shows that B(w) can be determined experimentally in a relatively straightforward manner. The experimental apparatus and the measurement procedure bear some similarity to the use of an impedance tube. The experimental results demonstrate that bulk reaction effects are important for Owens-Corning PF-705 Fiberglas board. For example, the calculated random incidence sound absorption coefficient for this material increased by an average of 39% over the range of measurement frequencies when bulk reaction was taken into account. © 1982, Acoustical Society of America. All rights reserved.

Full Text

Duke Authors

Cited Authors

  • Bliss, DB; Burke, SE

Published Date

  • March 1, 1982

Published In

Volume / Issue

  • 71 / 3

Start / End Page

  • 546 - 551

International Standard Serial Number (ISSN)

  • 0001-4966

Digital Object Identifier (DOI)

  • 10.1121/1.387523

Citation Source

  • Scopus