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DTSTART;TZID=Europe/Berlin:20260227T110000
DTEND;TZID=Europe/Berlin:20260227T113000
DTSTAMP:20260425T183859
CREATED:20260302T134716Z
LAST-MODIFIED:20260302T134716Z
UID:3909-1772190000-1772191800@blog.rwth-aachen.de
SUMMARY:Xiao Lou: Impact of Diffraction Orders in Dynamic Urban Acoustic Simulations
DESCRIPTION:In urban acoustic environments\, sound propagation is heavily influenced by obstacles that block the direct line-of-sight\, making diffraction a crucial mechanism for plausible acoustic simulations. While the Uniform Theory of Diffraction (UTD) resolves the unnatural discontinuities present in standard Geometric Acoustics (GA)\, the computational cost increases exponentially with each additional diffraction order. This thesis investigates the perceptual relevance of diffraction and reflection orders to determine an optimal threshold that can improve computational efficiency without compromising perceptual realism. \nUsing the Pynamic framework and the MOSQITO sound quality library\, a workflow was developed to generate time-dependent psychoacoustic metrics\, specifically loudness and sharpness\, integrated with Just Noticeable Difference (JND) thresholds. The study analyzed various geometric scenarios\, from simple 2D convex and concave edges to 3D building corners and complex urban intersections. \nThe results demonstrate that the optimal simulation order is highly geometry-dependent. For models with purely convex edges\, a simulation of third-order diffraction is required to smooth out discontinuities at shadow boundaries. However\, in scenarios with concave edges or in complex urban environments with ground reflections\, the masking effect caused by strong reflected energy often renders higher-order diffractions inaudible\, allowing for reduced simulation orders. Furthermore\, for an urban canyon model characterized by infinite parallel reflections\, it is recommended to neglect reflections beyond the third order. Finally\, the analysis reveals that stochastic signals with increased low-frequency energy\, such as pink noise\, and motion trajectories extending deep into acoustic shadow zones represent the stricter conditions for defining perceptual thresholds. These findings provide a set of quantitative guidelines for optimizing dynamic urban acoustic simulations. \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: 954 4073 3814\nPasswort: 450783
URL:https://blog.rwth-aachen.de/akustik/event/xiao-lou-impact-of-diffraction-orders-in-dynamic-urban-acoustic-simulations/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Bachelorarbeit
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DTSTART;TZID=Europe/Berlin:20260227T133000
DTEND;TZID=Europe/Berlin:20260227T140000
DTSTAMP:20260425T183859
CREATED:20260223T155623Z
LAST-MODIFIED:20260223T155623Z
UID:3906-1772199000-1772200800@blog.rwth-aachen.de
SUMMARY:Mochammad Setyokusumo: Industrial Internship at HEAD acoustics GmbH in the Engineering Service Department
DESCRIPTION:Active Noise Cancellation (ANC) and Talk-Through (TT) modes are common features in modern headsets. ANC typically provides enough attenuation that background noise becomes difficult to characterise. In this internship\, several warning signals\, such as passing cars and shouted speech\, were recorded and used as background noise\, and multiple headsets with ANC and TT were evaluated using these signals to determine whether recent headsets completely distort the signals or leave enough of a recognisable “footprint” for the user to identify them. \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: 954 4073 3814\nPasswort: 450783
URL:https://blog.rwth-aachen.de/akustik/event/mochammad-setyokusumo-industrial-internship-at-head-acoustics-gmbh-in-the-engineering-service-department/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Vortrag Praxissemester
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