Experimental study of internal noise on a shell submitted to boundary layer excitation

Abstract

A study has been done of the acoustic performance of elastic material shells, surrounded by a heavy fluid, submitted to a turbulent boundary layer excitation. Measurements of internal noise levels under localized excitation, in frequency bands, show good agreement with the result given by a statistical energy model. These results show significant effects of the structural properties and material for a given shell shape. The results agree well with noise and vibration measurements in a reciprocity situation (action of an internal noise source on the structure). Flexural waves in the shell material, although subsonic, play a major role.