Improvement of the sound transmission loss of panels by means of acoustically tuned resonators

M.H.C. Hannink

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    Abstract

    When a panel is excited, either structurally or acoustically, sound is radiated from the panel. Previous research by the author has shown that tuned acoustic tube resonators can be used to reduce the radiated sound. A one-dimensional analytical model model was validated by experiments in an impedance tube and good agreement was found between model and measurements. In this paper, the model is extended to describe the sound transmitted through a panel with acoustic resonators. Two different configurations are examined: panels with tubes and perforated sandwich panels. To verify whether the one-dimensional analytical models give a good prediction of the sound transmission loss, panels of both configurations were tested. Sound transmission loss measurements were performed by means of the sound intensitymethod (ISO 15186-1). The measurements showed that the resonators indeed increased the transmission loss compared with the mass law, in the frequency range for which the resonators were tuned. However, the increase was not as large as predicted by the onedimensional model. Resonators can be applied for various structural parts of an aircraft through which the transmission of sound has to be reduced. The research is performed as part of the EU project FACE (Friendly Aircraft Cabin Environment).
    Original languageEnglish
    Title of host publication25th Congress of the International Council of the Aeronautical Sciences, ICAS 2006
    Subtitle of host publication3-8 September 2006, Hamburg, Germany
    EditorsI. Grant
    Place of PublicationEdinburgh, UK
    PublisherOptimage Ltd
    Number of pages10
    ISBN (Print)9781604232271, 9780953399178
    Publication statusPublished - 3 Sep 2006
    Event25th Congress of the International Council of the Aeronautical Sciences, ICAS 2006 - Hamburg, Germany
    Duration: 3 Sep 20068 Sep 2006
    Conference number: 25
    https://www.icas.org/ICAS_ARCHIVE/ICAS2006/index.html

    Conference

    Conference25th Congress of the International Council of the Aeronautical Sciences, ICAS 2006
    Abbreviated titleICAS
    CountryGermany
    CityHamburg
    Period3/09/068/09/06
    Internet address

    Keywords

    • Sound
    • Transmission
    • Resonators
    • Panels

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  • Cite this

    Hannink, M. H. C. (2006). Improvement of the sound transmission loss of panels by means of acoustically tuned resonators. In I. Grant (Ed.), 25th Congress of the International Council of the Aeronautical Sciences, ICAS 2006: 3-8 September 2006, Hamburg, Germany [041] Edinburgh, UK: Optimage Ltd.