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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240308T100000
DTEND;TZID=Europe/Berlin:20240308T110000
DTSTAMP:20260504T084703
CREATED:20240305T190954Z
LAST-MODIFIED:20240305T190954Z
UID:2945-1709892000-1709895600@blog.rwth-aachen.de
SUMMARY:Drozdov: Estimation of a representative surface impedance for given incidence angle distributions
DESCRIPTION:Room acoustic simulations usually assume the acoustic impedance of surfaces to be independent from wave incidence angle – in other words locally reacting. For most materials this is a valid assumption. Some porous absorber structures are\, however\, non-locally reacting: Their surface impedance expresses a dependence on the direction of an incident wave – more exactly on the elevation angle. Still\, it can be useful to allocate an angle-independent representative impedance value to the material surface in order to simplify the simulation significantly at the cost of a manageable error. It is common practice to take the impedance at normal incidence or the impedance experienced in a uniform distribution of directions (diffuse field) as this representative value – all yielding non-negligble errors. This thesis tries to improve on previous methods by finding a representative impedance that takes into consideration the true incidence angle distribution experienced by a porous absorber in a real environment. With a theoretical construction of the incidence angle distribution and the definition of an effective impedance\, small improvements are achieved in numerical simulations of an oversimplified room geometry. \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/drozdov-estimation-of-a-representative-surface-impedance-for-given-incidence-angle-distributions/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Masterarbeit
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240308T103000
DTEND;TZID=Europe/Berlin:20240308T110000
DTSTAMP:20260504T084703
CREATED:20240305T094843Z
LAST-MODIFIED:20240305T094843Z
UID:2940-1709893800-1709895600@blog.rwth-aachen.de
SUMMARY:Kapidani: Supervised Learning for Modeling Reverberant Sound Fields
DESCRIPTION:This thesis focuses on learning a measuring method for the determination of the acoustic characteristics of porous materials within a reverberant room setting. Using a supervised learning approach\, this research aims to estimate from sound field measurements in the industry standard Alpha Cabin\, the most important material parameter that porous materials exhibit\, namely the flow resistivity. The Alpha Cabin serves as a controlled test space that closely emulates the interior of a compact MPV-class vehicle. The central objective of the study is to design a convolutional neural network\, that can be used to directly predict flow resistivity based on sound field measurements of the Alpha Cabin\, instead of a more complicated approach using iterative optimization and repeated numerical simulations. For this\, the strongly irregular sound field dominated by modes must be accurately modeled. The study considers various parameters\, including frequency\, humidity\, porosity of the material\, thickness of the absorber material\, and flow resistivity\, in order to generate a diverse dataset. This dataset serves as the basis for training the convolutional neural network to learn the underlying physical model\, enabling it to generate results for unseen data. \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/kapidani-supervised-learning-for-modeling-reverberant-sound-fields/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Bachelorarbeit
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240315T110000
DTEND;TZID=Europe/Berlin:20240315T120000
DTSTAMP:20260504T084703
CREATED:20240311T110022Z
LAST-MODIFIED:20240311T110022Z
UID:2943-1710500400-1710504000@blog.rwth-aachen.de
SUMMARY:Schwachtgen: Validation of Novel Determination Methods for Acoustic Material Parameters
DESCRIPTION:Adequate room acoustic conditions are crucial for creating comfortable communication\, learning\, or working environments. While acoustic simulations are an established tool for the prediction of the acoustic conditions in a room\, the input data describing the acoustic properties of the surfaces and objects in rooms comes with uncertainties. In this thesis work\, standardized and non-standardized methods to determine the acoustic characteristics of porous materials are compared for combined finite element and hybrid geometrical acoustic simulations. The impacts of differently determined data on simulated results are analyzed. For this purpose\, the reverberation chamber and the alpha cabin as test rooms are equipped with different porous absorbing materials for investigation. First\, room acoustic measurements are conducted in the empty rooms. Corresponding simulation models are then created and fitted to the measurements by adjusting the boundary conditions. Subsequently\, different material configurations are introduced into the real spaces and into the virtual models\, which are then measured or simulated respectively. Thus\, the simulation accuracy can be evaluated for the acoustic material parameters determined by different methods. \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/schwachtgen_validation-of-novel-determination-methods-for-acoustic-material-parameters/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Masterarbeit
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