In situ sound absorption measurement: investigations on oblique incidence

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Abstract

A novel method for the measurement of sound absorption has been developed. By assuming that, in a single point, the sound field consists of an incident- and a reflected plane wave, the locally incident- and reflected intensities can be determined. To this purpose, the active intensity and the sum of the potential-and the kinetic energy density (only the particle velocity component in the direction of interest is used) are measured. For normal incidence, the method was validated. Here, the method is applied to cases with oblique sound incidence. The influence of the angle of incidence and the non-planarity of the incident and reflected waves on the accuracy of the sound absorption coefficient are investigated. Analytical models as well as FE-simulations were applied to describe a few typical cases. Finally, parameter bounds for some applications will be given.
Original languageGerman
Title of host publicationDAGA 2012 Darmstadt
EditorsM. Klemenz
Place of PublicationBerlin
PublisherDEGA
Pages351-352
Publication statusPublished - 19 Mar 2012
Event38. Jahrestagung für Akustik, DAGA 2012 - Technischen Universität Darmstadt, Darmstadt, Germany
Duration: 19 Mar 201222 Mar 2012
Conference number: 38

Conference

Conference38. Jahrestagung für Akustik, DAGA 2012
Abbreviated titleDAGA
CountryGermany
CityDarmstadt
Period19/03/1222/03/12

Keywords

  • IR-80873
  • METIS-287091

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