We propose a new model for the propagation of acoustic energy from a time-harmonic point source through a network of interconnecting streets in the high frequency regime, in which the wavelength is small compared to typical macro-lengthscales such as street widths/lengths and building heights. Our model, which is based on geometrical acoustics (ray theory), represents the acoustic power flow from the source along any pathway through the network as the integral of a power density over the launch angle of a ray emanating from the source, and takes into account the key phenomena involved in the propagation, namely energy loss by wall absorption, energy redistribution at junctions, and, in 3D, energy loss to the atmosphere. The model predicts strongly anisotropic decay away from the source, with the power flow decaying exponentially in the number of junctions from the source, except along the axial directions of the network, where the decay is algebraic.
High frequency sound propagation in a network of interconnecting streets
Journal of Sound and Vibration ; 331 , 25 ; 5537-5561
2012
25 Seiten, 32 Quellen
Article (Journal)
English
High frequency sound propagation in a network of interconnecting streets
Online Contents | 2012
|INTERCONNECTING TEST SYSTEMS AND INTERCONNECTING TEST METHOD
European Patent Office | 2017
INTERCONNECTING TEST SYSTEMS AND INTERCONNECTING TEST METHOD
European Patent Office | 2017
|