Design of a New Testing Chamber to Determine the Absorption, Diffusion and Scattering Coefficients

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    Abstract

    This presentation will describe a design for a new 286 m3 testing chamber that will allow the measurement of the random incidence absorption coefficient, according to ISO 354, the scattering coefficient, according to ISO 17497-1, the diffusion coefficient, according to ISO 17497-2 and the normal incidence low frequency absorption coefficient, according to ISO 10534-2. Optional dimensional ratios were determined by minimizing the standard deviation of the modal response. Both dome-shaped boundary diffusors and hanging panels are used to provide satisfactory diffusivity, which is verified using a 200 mm reference absorber according to ISO 354. The isotropy of the incident sound is measured with a new Sound Field Analysis Recorder (SOFAR) and quantified by an analysis of the wavenumber spectrum. A sufficiently large reflection free volume is provided in the chamber for boundary method diffusion coefficient scale model goniometer measurements. A new FDTD simulation program will be described to determine the diffusion and scattering coefficients of any 3D surface in the near and far field. A steel and concrete lined low frequency impedance tube measuring 600 mm x 600 mm x 5.8 m long and 7 tons will be used to measure absorption from 25-250 Hz.
    Original languageEnglish
    Title of host publicationProceedings of 23rd International Congress on Acoustics
    Number of pages8
    PublisherDeutsche Gesellschaft für Akustik
    Publication date2019
    Pages2259-66
    ISBN (Print)978-3-939296-15-7
    Publication statusPublished - 2019
    Event23rd International Congress on Acoustics - Eurogress, Aachen , Germany
    Duration: 9 Sept 201913 Sept 2019
    http://www.ica2019.org/

    Conference

    Conference23rd International Congress on Acoustics
    LocationEurogress
    Country/TerritoryGermany
    CityAachen
    Period09/09/201913/09/2019
    Internet address

    Keywords

    • Coefficients
    • Measurements
    • Isotropy

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