Print Email Facebook Twitter Three–dimensional acoustic imaging using asynchronous microphone array measurements Title Three–dimensional acoustic imaging using asynchronous microphone array measurements Author Merino Martinez, R. (TU Delft Aircraft Noise and Climate Effects) von den Hoff, B. (TU Delft Aircraft Noise and Climate Effects) Morata, David Snellen, M. (TU Delft Control & Operations; TU Delft Aircraft Noise and Climate Effects) Contributor Döbler, D (editor) Department Control & Operations Date 2022 Abstract Complex test models in aeroacoustic experiments often present an arrangement of noise sources within a three–dimensional space. Planar microphone array normally have difficulties in separating sound sources in the direction normal to the array plane due to their poorer spatial resolution in this direction. This paper evaluates the benefits of combining asynchronous microphone array measurements for three–dimensional acoustic source. An experimental setup consisting of three out–of–plane speakers was considered. A planar microphone array was employed for the acoustic measurements in a baseline position and then displaced around the speakers to provide different points of view. The acoustic source maps obtained from each array position were combined using the geometric mean of their source autopowers. The performance of this approach in combination with the following acoustic imaging methods was investigated: conventional frequency domain beamforming (as baseline), functional beamforming, orthogonal beamforming, robust adaptive beamforming, CLEAN–SC, Richardson–Lucy deconvolution, and global optimization methods. For each case, the performance is evaluated in terms of accuracy in source position localization and spectral quantification in sound pressure level. In general, it was determined that combining additional views considerably improved the accuracy in terms of position localization (especially in the depth direction). To reference this document use: http://resolver.tudelft.nl/uuid:495aa0ca-34c9-43c3-bb5e-29cbe4c9d2da Source 9th Berlin Beamforming Conference 2022 Event 9th Berlin Beamforming Conference, 2022-06-09 → 2022-06-10, Berlin, Germany Part of collection Institutional Repository Document type conference paper Rights © 2022 R. Merino Martinez, B. von den Hoff, David Morata, M. Snellen Files PDF BeBeC_2022_S08.pdf 2.77 MB Close viewer /islandora/object/uuid:495aa0ca-34c9-43c3-bb5e-29cbe4c9d2da/datastream/OBJ/view