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This paper presents an analytical study for sound radiation of functionally graded materials (FGM) plate based on the three-dimensional theory of elasticity. The FGM plate is a mixture of metal and ceramic, and its material properties are assumed to have smooth and continuous variation in the thickness direction according to a power-law distribution in terms of volume fractions of the constituents. Based on the three-dimensional theory of elasticity and state space method, the governing equations with variable coefficients of the FGM plate are derived. The sound radiation of the vibration plate is calculated with Rayleigh integral. Comparisons of the present results with those of solutions in the available literature are made and good agreements are achieved. Finally, some parametric studies are carried out to investigate the sound radiation properties of FGM plates.

In this paper, the vibro-acoustic response of functionally graded materials (FGM) plates subjected to thermal environment are investigated analytically. The governing equations of the FGM plate subjected to thermal environment are derived based on the classic plate theory through Hamilton's principle. The sound radiation of the FGM plate is calculated with Rayleigh integral. It is found that a dramatic discrepancy will occur if temperature dependent material properties are not taken into account. The temperature rise also has a significant effect on the vibro-acoustic response of the FGM plates.