Far-field sound field estimation using robotized measurements and the boundary elements method
Résumé
Sound Field Estimation (SFE) is a numerical technique widely used to identify and reconstruct the
acoustic fields radiated by unknown structures. In particular, SFE proves to be useful when data
is only available close to the source, but information in the whole space is required. However, the
practical implementation of this method is still hindered by two major drawbacks: the lack of
efficient implementation of existing numerical methodologies, and the time-consuming and tedious
roll-out of acoustic measurements. This paper aims to provide a solution to both issues. First, the
measurements step is fully automated by using a robotic arm, able to accurately gather geometric
and acoustic data without any human assistance. In this matter, a particular attention has been
paid to the impact of the robot on the acoustic pressure measurements. The sound field prediction
is then tackled using the Boundary Element Method (BEM), and implemented using the FreeFEM++
BEM library. Numerically simulated measurements have allowed us to assess the method accuracy,
and the overall solution has been successfully tested using actual robotized measurements of an
unknown loudspeaker
Domaines
Acoustique [physics.class-ph]Origine | Fichiers produits par l'(les) auteur(s) |
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