... discretizations may be chosen to obtain high eigenfrequencies. We discuss the stability and convergence of the proposed method. Finally we show some examples. 04 05 2005 19 01 2009 07 04 2009 architectural acoustics boundary-elements methods eigenvalues and eigenfunctions Galerkin method...

... simulations. acoustic porous materials fibrous material rigid frame finite element compression acoustic materials porous materials acoustic wave absorption acoustic wave propagation acoustic wave transmission finite element analysis architectural acoustics vibrations noise abatement...

... . Physikalisch-Technische Bundesanstalt , Project 1.401: simulation of room acoustics, http://www.ptb.de/en/org/l/l7/173/roundrob2_l.htm 13 10 2004 09 10 2005 architectural acoustics reverberation acoustic wave reflection acoustic field acoustic wave absorption acoustic intensity...

... results in Ref. 4 (Fig. 13 (b)). Acceptable agreement can be confirmed. acoustic wave absorption architectural acoustics Galerkin method variational techniques linear algebra In terms of the cylindrical coordinates, the wave equation ( 3 ) and the boundary condition (6) are expressed...

... 2002 12 06 2002 acoustic wave absorption acoustic wave reflection porous materials surface acoustic waves differential equations acoustic materials acoustic impedance architectural acoustics The use of corrugated or ridgy absorbent surfaces usually presents two major...