19th Asia-Pacific Vibration Conference (APVC2021)

426 / 2022-08-01 16:52:01

Reconstruction of Acoustic Radiation from a Plane under Subsonic Turbulent Boundary Layer Excitation using Near-field Acoustic Holography

Turbulent boundary layer,near-field acoustic holography,interior sound field,sound radiation

 In this paper, the structural vibration and acoustic radiation excited by random excitation sources such as a turbulent boundary layer (TBL) are calculated, and the structural vibration is reconstructed using near-field acoustic holography (NAH). The vibration response of the structure under random excitation is represented by a double integral with respect to the spatial coordinates, and the acoustic radiation under the input of the displacement power spectrum of the plate-shell structure is solved based on the Rayleigh integral. For the inverse problem, referring to the near-field acoustic holography theory, the prediction surface and the reconstruction surface are defined. The results of the reconstruction are compared with the results of the forward calculation to prove the effectiveness of the method.