A NUMERICAL AND EXPERIMENTAL STUDY OF VIBROACOUSTIC RESPONSES OF A PANEL EXCITED BY A TURBULENT BOUNDARY LAYER

摘要

A hybrid finite element method (FEM) - boundary element method (BEM) technique is used to predict the structural and acoustic responses of a panel in low Mach number flow. Analytical expressions are used to estimate the turbulent boundary layer (TBL) parameters over the surface of the panel. The spectrum of the wall pressure fluctuations is evaluated from the TBL parameters and by using semi-empirical models from literature. The wall pressure field underneath the TBL is synthesized by realisations of uncorrelated wall plane waves. The FEM-BEM approach is adopted to compute the structural and acoustic responses of the panel for each realisation of uncorrelated wall plane waves. The responses are then obtained from an ensemble average of the different realisations. Numerical results are compared with experimental data obtained in an anechoic wind tunnel at the Universite de Sherbrooke. The proposed technique for predicting the vibroacoustic responses of a structure in turbulent flow is computationally efficient.