Vibro-acoustic analysis of laminated composite cylindrical and conical shells using meshfree method

Abstract

This paper intends to investigate the vibro-acoustic responses of cross-ply laminated composite shell including cylindrical and conical shells subjected to acoustic medium by employing meshfree method. The energy principle, first-order shear deformation theory (FSDT) and the Kirchhoff-Helmholtz integral equation are employed to deduce the theoretical formulations of the structural and acoustic models. The displacement and acoustic pressure of laminated composite shells and acoustic medium are described by employing the meshfree shape function and Fourier series. The interior CHIEF points is introduced for eliminating the non-unique solution with regard to the acoustic integral equations. The reliability and accuracy of presented method are verified for forecasting the vibro-acoustic characteristics of the laminated composite shells by comparing to the vibration and the acoustic response results of published articles. Furthermore, the parametric analysis is performed by investigating the influences of geometric dimensions, material properties, boundary conditions and external force types on the acoustic responses of shell, which is beneficial to the preliminary design of the shell structure immersed in acoustic medium.