Multiphysical numerical (FE-BE) solution of sound radiation responses of laminated sandwich shell panel including curvature effect

摘要

In this paper, a numerical scheme is prepared using the higher-order shear deformation type of kinematic model with the help of a coupled finite and boundary elements (FE-BE) to evaluate the vibroacoustic responses of laminated composite sandwich curved shell panels. The panel is under the influence of a harmonic point load. Further, an FE-BE combined technique is utilized to prepare a generic computer code (MATLAB environment) for the numerical prediction via the proposed mathematical formulation. The structural frequency and the subsequent sound relevant data are obtained by solving the final form of the multiphysics model. In this regard, the structural system equation is derived through Hamilton's principle and the Helmholtz wave equation for the computation of acoustic responses. The performance of the proposed scheme is established initially through the convergence and the corresponding validation studies. The comparison cases are made with the available published benchmark frequency (free vibration) as well as the acoustic data. Appropriate numbers of numerical examples are solved to draw the meaningful inferences of various factors to show the significant influences on the acoustic radiation responses of the curved sandwich panel type of structural components. The curvature ratio is showing the accentuated influences on the sound radiation responses for the low-frequency ranges whereas the increase in the thickness ratio, i.e. the ratio of core to face leads to an accentuated radiated sound power. (C) 2020 Elsevier Ltd. All rights reserved.