A novel technique for measuring the reflection coefficient of sound absorbing materials

H.E. de Bree, F.J.M. van der Eerden, J.W. van Honschoten

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    7 Citations (Scopus)
    51 Downloads (Pure)

    Abstract

    A new method to measure the acoustic behaviour of sound absorbing material in an impedance tube is presented. The method makes use of a novel particle velocity sensor, the microflown, and a microphone. The so-called p·u method is compared to three other methods of which the two microphone technique is well known. It is shown that the combination of a microphone and a microflown provides direct information on the acoustic impedance, the sound intensity and the sound energy density. The experimental results are compared to the results obtained with the conventional impedance tube measurements. To be able to repeat the measurements in a reliable way a well described test sample with a quarter-wave resonator is used. Furthermore it is shown that the viscothermal effects on the wave propagation are important, i.e. for the quarter-wave resonator and to a lesser extent for the impedance tube itself.
    Original languageEnglish
    Title of host publicationProceedings of ISMA 25, 2000 International Conference on Noise and Vibration Engineering
    Place of PublicationLeuven
    PublisherKatholieke Universiteit Leuven
    Pages1-8
    Number of pages8
    ISBN (Print)90-73802-76-8
    Publication statusPublished - 13 Sep 2000
    Event2000 International Conference on Noise and Vibration Engineering, ISMA 2000 - Leuven, Belgium
    Duration: 13 Sep 200015 Sep 2000
    Conference number: 25
    http://past.isma-isaac.be/isma25/

    Conference

    Conference2000 International Conference on Noise and Vibration Engineering, ISMA 2000
    Abbreviated titleISMA
    CountryBelgium
    CityLeuven
    Period13/09/0015/09/00
    Internet address

    Keywords

    • METIS-203735
    • EWI-21565
    • IR-58901

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