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    Sound absorption of porous substrates covered by foliage: experimental results and numerical predictions

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    Publication date
    2013
    Author
    Ding, L.
    Van Renterghem, T.
    Botteldooren, D.
    Horoshenkov, Kirill V.
    Khan, Amir
    Keyword
    Absorption
    ; Computer simulation
    ; Construction materials
    ; Facility design and construction
    ; Models
    ; Motion
    ; Numerical analysis
    ; Plant leaves
    ; Porosity
    ; Pressure
    ; Sound
    ; Time factors
    ; Vibration
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    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    The influence of loose plant leaves on the acoustic absorption of a porous substrate is experimentally and numerically studied. Such systems are typical in vegetative walls, where the substrate has strong acoustical absorbing properties. Both experiments in an impedance tube and theoretical predictions show that when a leaf is placed in front of such a porous substrate, its absorption characteristics markedly change (for normal incident sound). Typically, there is an unaffected change in the low frequency absorption coefficient (below 250 Hz), an increase in the middle frequency absorption coefficient (500-2000 Hz) and a decrease in the absorption at higher frequencies. The influence of leaves becomes most pronounced when the substrate has a low mass density. A combination of the Biot's elastic frame porous model, viscous damping in the leaf boundary layers and plate vibration theory is implemented via a finite-difference time-domain model, which is able to predict accurately the absorption spectrum of a leaf above a porous substrate system. The change in the absorption spectrum caused by the leaf vibration can be modeled reasonably well assuming the leaf and porous substrate properties are uniform.
    URI
    http://hdl.handle.net/10454/9642
    Version
    No full-text available in the repository
    Citation
    Ding L, Van Renterghem T, Botteldooren D, Horoshenkov KV and Khan A (2013) Sound absorption of porous substrates covered by foliage: experimental results and numerical predictions. Journal of the Acoustical Society of America. 134(6): 4599-4609.
    Link to publisher’s version
    http://dx.doi.org/10.1121/1.4824830
    Type
    Article
    Collections
    Engineering and Informatics Publications

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