Sound Radiation from a Finite FGM Cylindrical Shell Covered with a Compliant Layer

The characteristics of vibration and sound radiation from a finite FGM cylindrical shell with the outer shell coated with compliant layer are systematically studied. The shell´s motion function is expressed by FGM shell motion, whereas the layer motion is described by means of the three-dimensional Navier equations whose displacement solutions are expressed by Taylor expansion along the layer thickness. The continuity conditions of displacement and stress between the FGM shell and the layers are used in obtaining the vibration equations. In this analysis, provided that the thickness layer divided by the dilatation wavelength in the compliant layer (h_c/lambda₀) remains small compared to unity, one can develop the layer displacement field in powers of epsiv truncated at order S. And the material properties of the FGM shell are assumed to vary through the thickness. Numerical results are shown that exhibit the influence of the coating layer on the vibroacoustic behavior of the FGM shell.