Structural-acoustic analysis of partially submerged laminated composite cylinders containing partially filled fluid: Considering transverse shear deformation

Abstract

This study investigates the vibroacoustic behavior of a partially submerged laminated composite cylindrical shell containing a partially filled fluid. In this study, three different coordinate systems are employed: one focusing on structural dynamics, while the other two are used to calculate the expression for acoustic pressure radiation within the external and internal fluids. By utilizing the coordinates related to acoustic pressure, the study obtains a sine series expression for the sound pressure to satisfy the boundary condition on the free surface of both the internal and external acoustic media. As the cylindrical structure experiences transverse shear deformation, the First-Order Shear Deformation Theory (FSDT) is applied to simulate the dynamic behavior of the composite shell. Additionally, the study examines fluid-structure compatibility at the interface, establishing a relationship between the sound pressure radiation in the acoustic medium and the structure's vibration. Finally, by utilizing the Galerkin method, the frequency responses of the vibroacoustic behavior are obtained. The numerical results illustrate how various acoustical and structural parameters affect vibroacoustic behavior. These parameters include the nondimensional fluid height inside and around the composite structure, the material of the composite layers, and different stacking sequences of symmetric and anti-symmetric laminated composites. Furthermore, the study presents contour plots of sound pressure, offering insights into the wavelengths of acoustic pressure at different frequencies and load distribution angles.