Vibroacoustic testing of panels under a turbulent boundary layer excitation using a space-time spectral synthesis approach

Olivier Robin (1) , Marc Pachebat (2) , Nicolas Totaro (3) , Alain Berry (1)

1 GAUS - Groupe d'Acoustique de l'Université de Sherbrooke
2 LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]
3 LVA - Laboratoire Vibrations Acoustique

The experimental study of a structure’s response to a turbulent boundary layer (TBL) excitation using wind-tunnel or in-vehicle testing generally requires considerable efforts, including the measurement of both turbulent wall-pressure fluctuations and the structure’s vibration response. As an alternative method to highly demanding testing procedures and numerical simulations, this paper proposes a computationally efficient method to predict vibroacoustic responses of a panel under a TBL excitation. Space-time realizations of a TBL wall pressure field obtained using a spectral synthesis approach are coupled to a deterministic model so as to predict mean quadratic velocity, and radiated sound pressure and power from a panel under a TBL excitation. Each realization of the wall pressure field and obtained vibroacoustic results can be considered as a virtual experiment. The radiated sound pressure as a function of time can be also obtained, and possibly later used for listening and psychoacoustics studies objectives. A summary of existing experimental and numerical methods for obtaining the vibroacoustic response of panels to a TBL excitation is first presented. The proposed method is then detailed. Results obtained using this method are finally compared to results obtained using controlled laboratory experiments and analytical calculations for a low subsonic flow speed.

Domaines: Acoustique [physics.class-ph]; Vibrations [physics.class-ph]

Olivier Robin, Marc Pachebat, Nicolas Totaro, Alain Berry. Vibroacoustic testing of panels under a turbulent boundary layer excitation using a space-time spectral synthesis approach. Elena Ciappi; Stephen A. Hambric; Randolph C. K. Leung; Vincent Clair; Laurent Maxit; Nicolas Totaro; Sergio De Rosa; Francesco Franco. Flinovia—Flow Induced Noise and Vibration Issues and Aspects-III, Springer International Publishing, pp.87-111, 2021, ⟨10.1007/978-3-030-64807-7_5⟩. ⟨hal-04570688⟩