Acoustic transmission through laminated composite cylindrical shell employing Third order Shear Deformation Theory in the presence of subsonic flow

In this paper acoustic behavior of the laminated composite cylindrical shell, excited by an oblique plane sound wave, is investigated. The cylindrical shell is assumed to be infinitely long with uniform airflow in the external fluid medium. To provide an analytical solution of Sound Transmission Loss (STL) based on Third-order Shear Deformation Theory (TSDT), the displacements are developed as the cubic order of the thickness coordinate. Furthermore, the equations of wave propagation are expanded to determine STL beside vibration equations of laminated composite cylindrical shell, simultaneously. Then, the obtained result is compared with that of previous models. However, the importance of using Third-order Shear Deformation Theory (TSDT) reveals the fact that the present model demonstrates more accurate results, particularly for thick shell where the effects of the shear and rotation become more significant in lower R/h. Moreover, with changing the R/h ratios, the difference between the present study (TSDT) and other shell theory such as First-order Shear Deformation Theory (FSDT) is increased. Eventually, numerical results are discussed to indicate the effectiveness of different structural properties and geometrical properties on STL.