Design and experimental validation of an array of accelerometers for in-flow acoustic beamforming applications
Résumé
The aim of this work is to present an experimental validation of in-flow beamforming using vibration measurements. An antenna of accelerometers is mounted on a thin structure placed in the flow. High wavenumbers of the turbulent boundary layer are naturally filtered out by the structure, such that accelerometers are mainly dominated by the acoustic part of the excitation. An inverse method is used to reconstruct the pressure exciting the structure from vibration measurements, that is then injected in a beamforming code. The experiment shows the ability of the inverse method to reconstruct the acoustic part of the excitation, and validates the possibility to use it for acoustic source localisation