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DTSTART;TZID=Europe/Berlin:20260507T130000
DTEND;TZID=Europe/Berlin:20260507T140000
DTSTAMP:20260506T220726
CREATED:20260504T163530Z
LAST-MODIFIED:20260504T164403Z
UID:3967-1778158800-1778162400@blog.rwth-aachen.de
SUMMARY:Robert Schmitt: Filters for Sound Propagation over Discontinuous Surfaces
DESCRIPTION:Traffic noise in urban environments constitutes a significant health hazard\, creating potential for proactive noise management and auralization as tool for modern urban planning. However\, state-of-the-art raybased Geometrical Acoustics (GA) models utilized in current auralization pipelines struggle to predict the sound propagation across grounds featuring varying acoustic properties\, known as Impedance Discontinuity (ID). Relying just on Specular Reflection (SR) leads to unphysical\, abrupt spectral changes when a geometric reflection point moves across an ID. To resolve such discontinuities\, this thesis proposes extensions to the reflection and diffraction propagation simulation of sound propagation based on GA. First\, the reflection filter is extended to incorporate the Weyl-Van der Pol approximation\, accounting for spherical wavefront curvature over finite impedances. Second\, the M-UTD is introduced. The M-UTD treats an ID as a diffractive edge by adapting electromagnetic diffraction models incorporating extensions by Luebbers\, Holm\, and Schettino to acoustic propagation. The M-UTD is evaluated against Boundary Element Method (BEM) simulations and experimental measurements. These investigations cover single and multiple IDs scenarios on flat surfaces\, angled wedges\, and a dynamic auralization scenario. The results demonstrate that the M-UTD successfully compensates for the magnitude and phase differences at material boundaries. By computing a continuous diffraction component driven by the impedance mismatch\, the model reduces discrete amplitude fluctuations during dynamic source movement\, yielding a much smoother and more physically plausible time-variant spectrogram. While limitations remain at low frequencies and grazing angles\, the proposed M-UTD provides an efficient\, reciprocal\, and robust solution. Ultimately\, it improves the agreement of the calculated sound field over discontinuous surfaces with BEM simulations and measurements. \nMelden Sie sich hier an um Einladungen zu den Kolloquium-Vorträgen per E-Mail zu erhalten.\nRegister here to receive the invitations to colloquium talks via e-mail. \nZoom-Meeting-ID: 643 7384 8607\nPasswort: 2020000
URL:https://blog.rwth-aachen.de/akustik/event/robert-schmitt-filters-for-sound-propagation-over-discontinuous-surfaces/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Masterarbeit
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