Analytical and numerical prediction of acoustic radiation from a panel under turbulent boundary layer excitation

• Published in: Journal of sound and vibration Vol. 479; p. 115372
• Main Authors: Karimi, M., Maxit, L., Croaker, P., Robin, O., Skvortsov, A., Marburg, S., Atalla, N., Kessissoglou, N.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Ltd 04.08.2020; Elsevier Science Ltd; Elsevier
• Subjects: Acoustic radiation; Acoustics; Boundary layer; Computational fluid dynamics; Excitation; Finite element method; Fluid flow; Mathematical analysis; Mathematical models; Mechanics; Numerical analysis; Numerical models; Numerical prediction; Physics; Plane waves; Radiation; Sound waves; Stiffeners; Turbulent boundary layer; Turbulent flow; Uncorrelated wall plane waves; Wall pressure; Wall pressure field; Wind tunnels; Turbulent boundary layer; Uncorrelated wall plane waves; Wall pressure field; Acoustic radiation; radiated noise; pressure field synthesis; vibroacoustic; numerical method; turbulent flow; turbulent boundary layer; flow noise
• ISSN: 0022-460X; 1095-8568
• DOI: 10.1016/j.jsv.2020.115372

The vibroacoustic response of a simply supported panel excited by turbulent flow is analytically and numerically investigated. In the analytical model, the radiated sound power is described in terms of the cross spectrum density of the wall pressure field and sensitivity functions for the acoustic pressure and fluid particle velocity. For the numerical model, a hybrid approach based on the finite element method is described in which the cross spectrum of the wall pressure field is represented by a set of uncorrelated wall plane waves. Realisations of the wall pressure field are used as deterministic input loads to the panel. The structural and acoustic responses of the panel subject to turbulent boundary layer excitation are then obtained from an ensemble average of the different realisations. Analytical and numerical results are compared with experimental data measured in an anechoic wind tunnel, showing good agreement. The effect of adding stiffeners on the vibroacoustic response of the panel is also examined using the proposed numerical approach.