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Rakotoarisoa I, Fischer J, Valeau V, et al. Time-domain delay-and-sum beamforming for time-reversal detection of intermittent acoustic sources in flows. J Acoust Soc Am. 2014;136(5):2675-86doi: 10.1121/1.4897402.
Rakotoarisoa, I., Fischer, J., Valeau, V., Marx, D., Prax, C., & Brizzi, L. E. (2014). Time-domain delay-and-sum beamforming for time-reversal detection of intermittent acoustic sources in flows. The Journal of the Acoustical Society of America, 136(5), 2675-86. https://doi.org/10.1121/1.4897402
Rakotoarisoa, Ifanila, et al. "Time-domain delay-and-sum beamforming for time-reversal detection of intermittent acoustic sources in flows." The Journal of the Acoustical Society of America vol. 136,5 (2014): 2675-86. doi: https://doi.org/10.1121/1.4897402
Rakotoarisoa I, Fischer J, Valeau V, Marx D, Prax C, Brizzi LE. Time-domain delay-and-sum beamforming for time-reversal detection of intermittent acoustic sources in flows. J Acoust Soc Am. 2014 Nov;136(5):2675-86. doi: 10.1121/1.4897402. PMID: 25373968.
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J Acoust Soc Am. 2014 Nov;136(5):2675-86. doi: 10.1121/1.4897402.

Time-domain delay-and-sum beamforming for time-reversal detection of intermittent acoustic sources in flows.

The Journal of the Acoustical Society of America

Ifanila Rakotoarisoa, Jeoffrey Fischer, Vincent Valeau, David Marx, Christian Prax, Laurent-Emmanuel Brizzi

Affiliations

  1. Institut PPRIME UPR 3346, CNRS - Université de Poitiers - ENSMA, Bât. B17 - 6 rue Marcel Doré, 86022 Poitiers Cedex, France.

PMID: 25373968 DOI: 10.1121/1.4897402

Abstract

This study focuses on the identification of intermittent aeroacoustic sources in flows by using the time-domain beamforming technique. It is first shown that this technique can be seen as a time-reversal (TR) technique, working with approximate Green functions in the case of a shear flow. Some numerical experiments investigate the case of an array measurement of a generic acoustic pulse emitted in a wind-tunnel flow, with a realistic multi-arm spiral array. The results of the time-domain beamforming successfully match those given by a numerical TR technique over a wide range of flow speeds (reaching the transonic regime). It is shown how the results should be analyzed in a focusing plane parallel to the microphone array in order to estimate the location and emission time of the pulse source. An experimental application dealing with the aeroacoustic radiation of a bluff body in a wind-tunnel flow is also considered, and shows that some intermittent events can be clearly identified in the noise radiation. Time-domain beamforming is then an efficient tool for analyzing intermittent acoustic sources in flows, and is a computationally cheaper alternative to the numerical TR technique, which should be used for complex configurations where the Green function is not available.

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