High-quality numerical simulations in room acoustics require a detailed knowledge of the acoustic reflection characteristics of the materials in the room, in order to realistically model the interferences between multiple sound reflections at the room boundaries. While different standardized measurement methods exist for the determination of the absorption coefficient and reflection factor these methods can generally not be applied in situ. Thus time-consuming laboratory measurements and the supply of material samples are required. Driven by the obvious demand for a reliable in situ measurement technique, a pu-probe based method has emerged during the last years, which derives the reflection factor based on the simultaneous measurement of sound pressure and velocity. However, previous investigations of the setup and publications by other authors have shown that the measurement results are affected by various uncertainty factors. The present study aims at the identification, separation, and quantitative assessment of the uncertainty factors related to reflection and diffraction effects at the loudspeaker, sensor, and the absorber geometry. Therefore, a purely simulative approach will be used that replicates the actual measurement situation in every detail, including the geometries of sensor, loudspeaker, and absorber. The simulation setup is validated by measurements and is used to systematically separate the different uncertainty factors.
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August 2013
August 01 2013
On the in situ impedance measurement with pu-probes—Simulation of the measurement setup
Markus Müller-Trapet;
Markus Müller-Trapet
a)
Institute of Technical Acoustics,
RWTH Aachen University
, 52066 Aachen, NRW, Germany
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Pascal Dietrich;
Pascal Dietrich
Institute of Technical Acoustics,
RWTH Aachen University
, 52066 Aachen, NRW, Germany
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Marc Aretz;
Marc Aretz
Institute of Technical Acoustics,
RWTH Aachen University
, 52066 Aachen, NRW, Germany
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Jan van Gemmeren;
Jan van Gemmeren
Institute of Technical Acoustics,
RWTH Aachen University
, 52066 Aachen, NRW, Germany
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Michael Vorländer
Michael Vorländer
Institute of Technical Acoustics,
RWTH Aachen University
, 52066 Aachen, NRW, Germany
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
J. Acoust. Soc. Am. 134, 1082–1089 (2013)
Article history
Received:
May 27 2012
Accepted:
May 28 2013
Citation
Markus Müller-Trapet, Pascal Dietrich, Marc Aretz, Jan van Gemmeren, Michael Vorländer; On the in situ impedance measurement with pu-probes—Simulation of the measurement setup. J. Acoust. Soc. Am. 1 August 2013; 134 (2): 1082–1089. https://doi.org/10.1121/1.4812250
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