Resumen de Sound transmission loss of a porous heterogeneous cylindrical nanoshell employing nonlocal strain gradient and first-order shear deformation assumptions
Ehsan Heydari, Ali Mokhtarian, Mostafa Pirmoradian, Mohammad Hashemian, Alireza Seifzadeh
The size-dependent sound transmission loss problem of an air-filled functionally graded material cylindrical shell subjected to a plane progressive sound wave with even and uneven porosity distributions was analytically studied using a nonlocal strain gradient and the first-order shear deformation theories. To simulate the heterogeneous material, the impressive material properties were supposed to be associated with the porosity volume fraction model, based on a power-law model. They were suggested to be constantly changeable along the thickness direction. The motion equations were extracted by Hamilton’s principle and then solved using the Fourier-Bessel series. The accuracy of the obtained formulation were strictly proved by comparing the data accessible in the literature.
Parameter studies reveal the effects of material gradient index, size scale factors, porosity volume fraction, and incident angles on the variations in the amplitude of sound transmission loss through the nanoshell.
