Effects of Sound Propagation
The sound propagation model applied by the Gesellschaft für Akustikforschung Dresden mbH consideres among others the following effects:
- air absorption
- modeling according to ISO 9613-1
- ground-borne reflection
- consideration of reflexion of spherical waves according to Weyl van der Pol
- modeling of sound propagation above impedance surfaces with discontinuities by modification of “Fresnel-zone model” of Hothersall
- sound diffraction wedge-shaped obstacles with absorbing surfaces
- e.g. screen, noise protection wall, tunnel mouth
- modeling according to Hadden and Pierce
- diffuse sound reflection at structured surfaces
- modeling according to Nord 2000)
- sound reflection at the top edge of obstacles
- modification of “Fresnel-zone model” of Hothersall
- incoherence
- by sound diffraction caused by wind and temperature profiles as well as by atmospheric turbulence
- modeling according to SonRoad
Modeling of Sound Source
- sound power and directional characteristic of sound source
- determination e.g. by application of a microphone array
(see sound emission of vehicles)
- determination e.g. by application of a microphone array
