Coupled Vibroacoustic Model Based on Finite Element and Boundary Element Methods for Nonhomogeneous Composite Panels Excited by a Turbulent Boundary Layer Involving the Cholesky Decomposition
B. R. Adhikary1, A. Sahu2, P. Bhattacharya1
1Jadavpur University, Kolkata, India
2National Institute of Technology Silchar, Silchar, India
Keywords: nonhomogeneous turbulent boundary layer, Cholesky decomposition, structural vibration, finite element-boundary element coupling, sound radiation
Abstract
An original numerical framework is developed in the present research work in order to estimate the free field sound radiation from baffled structural panels subjected to nonhomogeneous turbulent boundary layer flow-induced excitation. A sequence of semi-analytical methods is used to estimate the nonhomogeneous turbulent boundary layer wall pressure spectrum, which is decomposed using the Cholesky technique to obtain the random wall pressure in the frequency domain. Structural panels are modeled using the finite element technique, and a coupled finite element-boundary element modeling technique is developed to estimate the sound power level radiated into the free field. Results are obtained for laminated composite structural panels with various fiber orientations.
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