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dc.contributor.authorDing, L.*
dc.contributor.authorVan Renterghem, T.*
dc.contributor.authorBotteldooren, D.*
dc.contributor.authorHoroshenkov, Kirill V.*
dc.contributor.authorKhan, Amir*
dc.date.accessioned2016-10-07T14:29:49Z
dc.date.available2016-10-07T14:29:49Z
dc.date.issued2013
dc.identifier.citationDing 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.
dc.identifier.urihttp://hdl.handle.net/10454/9642
dc.descriptionNo
dc.description.abstractThe 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.
dc.relation.isreferencedbyhttp://dx.doi.org/10.1121/1.4824830
dc.subjectAbsorption
dc.subject; Computer simulation
dc.subject; Construction materials
dc.subject; Facility design and construction
dc.subject; Models
dc.subject; Motion
dc.subject; Numerical analysis
dc.subject; Plant leaves
dc.subject; Porosity
dc.subject; Pressure
dc.subject; Sound
dc.subject; Time factors
dc.subject; Vibration
dc.titleSound absorption of porous substrates covered by foliage: experimental results and numerical predictions
dc.status.refereedYes
dc.typeArticle
dc.type.versionNo full-text available in the repository


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