Efficient calculation of two-dimensional periodic and waveguide acoustic Green’s functions


Autoria(s): Horoshenkov, K. V.; Chandler-Wilde, Simon N.
Data(s)

2002

Resumo

New representations and efficient calculation methods are derived for the problem of propagation from an infinite regularly spaced array of coherent line sources above a homogeneous impedance plane, and for the Green's function for sound propagation in the canyon formed by two infinitely high, parallel rigid or sound soft walls and an impedance ground surface. The infinite sum of source contributions is replaced by a finite sum and the remainder is expressed as a Laplace-type integral. A pole subtraction technique is used to remove poles in the integrand which lie near the path of integration, obtaining a smooth integrand, more suitable for numerical integration, and a specific numerical integration method is proposed. Numerical experiments show highly accurate results across the frequency spectrum for a range of ground surface types. It is expected that the methods proposed will prove useful in boundary element modeling of noise propagation in canyon streets and in ducts, and for problems of scattering by periodic surfaces.

Formato

text

Identificador

http://centaur.reading.ac.uk/32639/1/JAS001610.pdf

Horoshenkov, K. V. and Chandler-Wilde, S. N. <http://centaur.reading.ac.uk/view/creators/90000890.html> (2002) Efficient calculation of two-dimensional periodic and waveguide acoustic Green’s functions. Journal of the Acoustical Society of America, 111 (4). pp. 1610-1622. ISSN 0001-4966 doi: 10.1121/1.1460920 <http://dx.doi.org/10.1121/1.1460920>

Idioma(s)

en

Publicador

Acoustical Society of America

Relação

http://centaur.reading.ac.uk/32639/

creatorInternal Chandler-Wilde, Simon N.

http://dx.doi.org/10.1121/1.1460920

10.1121/1.1460920

Tipo

Article

PeerReviewed