In situ sound absorption measurement: investigations on oblique incidence

Kuipers, E.R. and Wijnant, Y.H. and Boer de, A. (2012) In situ sound absorption measurement: investigations on oblique incidence. In: DAGA 2012 Darmstadt, 19-22 Marz 2012, Berlin.

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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.
Item Type:	Conference or Workshop Item
Copyright:	© Deutsche Gesellschaft für Akustik
Faculty:	Engineering Technology (CTW)
Research Chair:	Structural Dynamics and Acoustics (SD&A)
Research Group:	Applied Mechanics (AM)
Link to this item:	http://purl.utwente.nl/publications/80873
Conference URL:	http://daga2012.de/
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