Error analysis of the pu in-situ absorption measurements in terms of background noise
Résumé
Several measurement techniques are available for the determination of the acoustic properties of materials. Kundt?s tube and reverberation room methods are widely used as standardized methods in laboratory environments, and thus not applicable in-situ. However, the acoustic properties can be changed when the materials are deformed or moved away from the original mounting for laboratory measurements. Several in-situ methods have been proposed, among which the PU in- situ method outperforms in terms of strong restriction of background noise and reflections, and a broad frequency range (typically from 300 Hz up to 10 kHz). This in-situ technique relies on direct measurements of sound pressure and acoustic particle velocity using a sound intensity PU probe. Acoustic impedance, sound reflection and acoustic absorption coefficients can be estimated by combining the measured data with an acoustic model. There are multiple sources of uncertainties that can bias the in-situ estimation, such as the measurement environment, measurement setup, material of the tested sample and calculation model. This paper introduces a set of quality indicators to assess the accuracy of the PU in-situ estimation of sound absorption. Each indicator is investigated by varying-condition in-situ measurements and statistical analysis.
Origine | Accord explicite pour ce dépôt |
---|