Effect of uniform and nonuniform temperature distributions on sound transmission loss of double-walled porous functionally graded magneto-electro-elastic sandwich plates with subsonic external flow

Abstract

Using the third-order shear deformation theory (TSDT), this research investigates the loss in sound transmission through air-filled rectangular double-walled sandwich smart magneto-electro-elastic (MEE) plates with a porous functionally graded material (PFGM) core layer, in the presence of external mean airflow and subjected to uniform and non-uniform temperature distributions. Multiple temperature profiles are evaluated in order to correctly capture the impact of the temperature rises over the thickness. Based on the power-law model, three different types of uneven porosity distributions are considered for the PFGM core layer. These distributions should change along the in-plane and thickness directions. Hamilton's concept is used to achieve the derivation of vibroacoustic equations as coupled relations. The sound transmission loss (STL) equation is obtained by using a double Fourier series in combination with an analytical method, i.e., the second velocity potential. The produced solution is evaluated in terms of accuracy and precision by comparing it to other accessible data from a previous study. The effects of the initial electric and magnetic potentials, porosity distributions, incidence angles, acoustic cavity depth, and changes in temperature profile on STL are shown by parameter investigations.

Keywords

• Uniform and nonuniform temperature distributions
• Noise transmission loss
• Magnetoelectroelastic plate, Porosity
• Functionally graded material