Inverse 2.5D Boundary Element method for moving sound source (en)

* Presenting author
Day / Time: 08.03.2023, 16:20-16:40
Room: Saal Y9
Typ: Vortrag (strukturierte Sitzung)
Abstract: In order to obtain the distribution of sound sources on a moving train, the feasibility of using the inverse boundary element method in the wavenumber domain with respect to the length coordinate, i.e. with a 2.5D approach is considered in this work. For the 2.5D method to be applicable, the train is considered to have a constant cross-section along the direction of motion. Furthermore, the train is assumed to move at a constant speed and measurements are done on a microphone array with a regular rectangular grid aligned vertically and parallel to the direction of motion. In the first step, the 2D cross-section the train is discretized with different velocity boundary conditions and the respective transfer functions to the microphones are derived. Based on these transfer functions it is attempted to determine a distribution of different velocity sound sources on the train using microphone array measurements. The resulting ill-posed inverse problem requires the use regularization methods to be effectively solved but in the absence of a-priori information solutions may vary across frequencies and thus additional changes are required to get correct solution for the under-determined system which is the topic of current investigations.


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