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Conference Papers Year : 2023

Resynchronization of tonal acoustic field in multi-pass non-stationary microphone array measurements

Abstract

The geometrical limitations of microphone arrays as well as the unavailability of multiple channel data ac- quisition systems or their incurred costs fundamentally challenge the sound source identification in acoustic imaging. This can be solved by sequentially scanning the object of study with a moving array with or without fixed references and requires the sound field to be stationary. In rotating machines, the generated vibroacoustic phenomena during a run-up or coast-down are non-stationary, and conventional resynchronization techniques cannot be directly implemented. To solve this problem, this study proposes a novel approach called Angu- lar Speed Resynchronization (ASR). The orders from several sequential measurements are first extracted us- ing time domain order tracking techniques, then synchronized into a single data set over which order based beamforming (OBBF) is performed. OBBF is an acoustic imaging technique that aids in the identification of non-stationary tonal sources. Given that the radiated sound field is determined for a given angular speed, the complex envelopes in the data set are realigned with respect to speed as if they were obtained from the same measurement with a full array. The proposed method is evaluated using an experimental data set collected from an induction motor. The approach demonstrates the capability of OBBF to accommodate with non-synchronous measurements during variable operating speed.
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Dates and versions

hal-04165668 , version 1 (19-07-2023)

Identifiers

  • HAL Id : hal-04165668 , version 1

Cite

Kalasagarreddi Kottakota, Jérôme Antoni, Quentin Leclère, Simon Bouley, Claudio Colangeli. Resynchronization of tonal acoustic field in multi-pass non-stationary microphone array measurements. Surveillance, Vibrations, Shock and Noise, Institut Supérieur de l'Aéronautique et de l'Espace [ISAE-SUPAERO], Jul 2023, Toulouse, France. ⟨hal-04165668⟩
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