Acoustic source detection inside a pipe using vibro-acoustic beamforming: assessment of the array gain from virtual experiments

Souha Kassab (1) , Sanae Serbout , Frédéric Michel (2) , Laurent Maxit (1)

1 LVA - Laboratoire Vibrations Acoustique
2 LRTH - Laboratoire de Réfrigération et ThermoHydraulique

In the R&D framework on sodium water heat exchangers, a monitoring technique based on vibration measurements is developed for detecting a leak of water into the sodium. However, leak-induced vibrations could be smeared in the ambient vibrations. In order to increase the signal-to-noise ratio (SNR), the conventionnel and MaxSNR beamforming treatments have been considered. In order to study their efficiency for the present application, one has developed a laboratory mock-up composed by a pipe coupled to a hydraulic circuit through two flanges. The source to detect is a sound emitter introduced into the pipe whereas the background vibration noise is controlled by changing the speed of the flow. In parallel, numerical vibro-acoustic tools were developed for predicting the vibratory response of the pipe excited by a monopole source or a turbulent boundary layer. These models allow us to realize virtual experiments mimicking the behavior of our laboratory test case. The virtual signals induced by the monopole source to be detected and by the turbulent flow are used for assessing the performances of the vibro-acoustic beamforming treatments. After a presentation of the vibro-acoustic models, we illustrate the array gain estimated using the virtual experiments for the two beamforming treatments.

Mots clés: beamforming; detection; pipe; vibro-acoustic modeling

Domaines: Acoustique [physics.class-ph]

Souha Kassab, Sanae Serbout, Frédéric Michel, Laurent Maxit. Acoustic source detection inside a pipe using vibro-acoustic beamforming: assessment of the array gain from virtual experiments. ICA 2019, Sep 2019, Aachen, Germany. ⟨hal-02414585⟩