RECONSTRUCTION OF ACOUSTIC FIELDS ON A PARTIALLY MASKED SOURCE USING INVERSE PATCH TRANSFER FUNCTION (IPTF) METHOD
Résumé
The acoustic source localization, reconstruction and ranking is a tedious task in industrial environments. Indeed, the source (for example a pump, an engine) is often of complex shape and partially masked by obstacles like mounting frames. In that case, the use of classical backpropagation techniques using arrays of microphones can be tricky. The aim of the presented works is to illustrate how the inverse Patch Transfer Functions (iPTF) can be used to tackle such a situation. The concept of iPTF is based on the application of Green's identity on any virtually closed volume defined around the source. In addition, it involves the discrete acoustic measurements performed at accessible positions around the source and the numerical computation of virtual volume mode shapes. In the present work, the advantages and limits of this approach are investigated through a parametric study on the simple test case of a simply supported plate masked by a rectangular rigid obstacle in front of it. This parametric study addresses the influence of distance between the structure and the obstacle and of the percentage of masked surface on the quality of the results. Some numerical results will be shown to illustrate the application and robustness of the iPTF in reconstruction of sound source in the presence of obstacle.
Domaines
Acoustique [physics.class-ph]Origine | Fichiers produits par l'(les) auteur(s) |
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