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  • Sensor for in-situ measurements of sound absorption [Elektronski vir]
    Prezelj, Jurij, strojnik ...
    A theoretical background and some measurement results for a new technique intended for in-situ measuring of sound absorption are presented. The measurement technique is a refinement of the classical ... method using reflection over the impedance plane. Refinement is based on the directivity pattern of dipole source in a very near field. Presented measurement results of absorption are obtained with basic evaluation of noise spectra. Comparison between measured absorption and absorption from kundt tube, are in good agreement, except in frequency range where absorption significantly depends on the flow resistivity of measured sample. Therefore a theoretical analysis was performed to found the source for this mismatch. Theoretical analysis of acoustical setup is based on the Rayleigh integral, which is used for calculations of sound propagation from complex sources, with integrated Delany-Bazly-Miki model. Analytical results with numerical simulations based on FEM analysis are compared in this preliminary study. Results of theoretical analysis indicate that calculation of absorption in low frequency range should be based on flow resistivity, whereas in higher frequency range a simple evaluation of noise spectra is sufficient. Theoretical results provide an excellent starting point for the design platform of the new sensor for sound absorption.
    Source: [6th Congress of the Alps Adria Acoustics Association, October 16th and 17th 2014, Graz [Elektronski vir] (Datoteka Prezelj_Lipar_Steblaj_Cudina_SensorForIn-SituMeasurementOfSoundAbsorption.pdf (8 f.))
    Type of material - conference contribution
    Publish date - 2014
    Language - english
    COBISS.SI-ID - 13814555

source: [6th Congress of the Alps Adria Acoustics Association, October 16th and 17th 2014, Graz [Elektronski vir] (Datoteka Prezelj_Lipar_Steblaj_Cudina_SensorForIn-SituMeasurementOfSoundAbsorption.pdf (8 f.))
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