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Effect of frequency-dependent ground impedance on the sound pressure level of a moving source

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Analytical and numerical models for sound propagation within a bounded domain are commonly developed in the frequency domain. Time-domain models, however, are an interesting alternative when studying transient e ects, non-uniform motion and for auralization purposes. Recent developments have been proposed to include the e ect of time-domain locally-reacting impedance into the pressure field solution. While the direct wave frequency for harmonic source remains unmodified, the frequency of the acoustic wave reflecting on the ground is modified due to the source motion. This work proposes a study of the influence of di erent ground models in the sound propagation from a moving monopolar source. The model relies on the transient time delayed Green's function formulation which extends the result of classical Doppler Weyl-Van der Pol equation for arbitrary velocity. The wave reflecting on the ground is accounted for using an image source with its amplitude attenuated according to a dopplerised frequency ground impedance model. A comparative study is proposed and applications to real scenarios are presented.

Document Type: Research Article

Affiliations: Siemens Industry Software. Leuven, Belgium

Publication date: September 30, 2019

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