In the present work, sound transmission loss (STL) of two plates functionally graded sandwich structures with a porous core is studied. The plates are modeled by first-order shear deformation theory. To obtain an acoustic metamaterial plate with the greatest STL, a functionally graded porous (FGP) plate with a tuned mass damper absorber is used. The obtained results show that using a FGP plate or using only an absorber is sufficient for increasing sound transmission loss, but the simultaneous use of them is effective in higher frequencies.
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