A wavenumber approach to quantifying nonuniform sound incidence in measurements of sound absorption in the reverberation chamber

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Abstract

Measured values of acoustic absorption obtained from standard reverberation chamber measurements often differ from theoretical random incidence absorption coefficients. These discrepancies mostly arise due to non-isotropic sound incidence on the absorbing specimen and diffraction at the sample edges. This study examines an experimental method for characterizing the distribution of sound incidence on the specimen under test conditions. The methodology relies on estimating the wavenumber spectrum to determine the magnitude of the sound waves arriving from definite directions onto the absorbing plane. The method is examined experimentally, based on measurements with a programmable robotic arm in a reverberant room in two damping conditions. The corresponding spatial distribution of the active sound intensity field can also be inferred, making it possible to benchmark the proposed methodology with observations of the incident energy flows.
Original languageEnglish
Title of host publicationEuronoise 2018 - Conference Proceedings
PublisherEuropean Acoustics Association
Publication date2018
Pages2031-2038
Publication statusPublished - 2018
EventEuronoise 2018 - Convention Center Creta Maris, Hersonissos, Crete, Greece
Duration: 27 May 201831 May 2018

Conference

ConferenceEuronoise 2018
LocationConvention Center Creta Maris
CountryGreece
CityHersonissos, Crete
Period27/05/201831/05/2018

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