@article {Wilson:2006:1610-1928:965,
title = "Time-Domain Modeling of the Acoustic Impedance of Porous Surfaces",
journal = "Acta Acustica united with Acustica",
parent_itemid = "infobike://dav/aaua",
publishercode ="dav",
year = "2006",
volume = "92",
number = "6",
publication date ="2006-11-01T00:00:00",
pages = "965-975",
itemtype = "ARTICLE",
issn = "1610-1928",
url = "http://www.ingentaconnect.com/content/dav/aaua/2006/00000092/00000006/art00016",
author = "Wilson, D. Keith and Collier, Sandra L. and Ostashev, Vladimir E. and Aldridge, David F. and Symons, Neill P. and Marlin, David H.",
abstract = "A time-domain boundary condition (TDBC) for acoustic reflections from a rigid-frame porous material is derived. The TDBC is the time-domain counterpart of the familiar, linear, frequency-dependent surface impedance for locally reacting surfaces. Although the TDBC is developed from a rather simple, two-parameter phenomenological model, it is shown to apply to a broad range of frequencies and to agree closely with predictions from more sophisticated models that do not have readily derivable time-domain formulas. The TDBC gives the pressure as the sum of two terms involving the particle velocity normal to the surface of the material: one term is directly proportional to the particle velocity at the present time, whereas the other involves a convolution of the particle velocity with a slowly decaying response function. Numerical implementation of the TDBC is discussed and illustrated with example finite-difference, time-domain calculations involving propagation over a porous ground surface.",
}