Conference_programme: 18.6 - Acoustics of reverberation chambers
Lecture: A wavenumber approach to quantifying non-uniform sound incidence in measurements of sound absorption in the reverberation chamber
Author(s): Nolan Mélanie, Verburg Samuel A., Jeong Cheol-Ho, Brunskog Jonas, Fernandez-Grande Efren
Summary:
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.
Corresponding author
Name: Ms Mélanie Nolan
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Country: Denmark
