Attractive properties of Functionally Graded (FG) porous materials (porous materials with functionally graded
porosity) are of special interest to engineers and researchers to design and develop improved mechanical
properties in a wide range of aerospace, biomedical, civil, mechanical and vehicle engineering applications. This
paper aims to use First-order Shear Deformation Theory (FSDT) and investigate free vibration of tapered circular
porous plates with graded open-cell porosity as a new lightweight and basic structural element. Plates with both
constant and linear symmetric thickness variations about the mid-plane of the circular plate are studied. FGInternal-
Solid, FG-External-Solid and Uniform porosities are also introduced as three types of porosity distributions
through the radial direction of the circular plate. The equations of motion are derived using Newton's
second law with simply supported and clamped end conditions. A pseudospectral method is used to numerically
solve the equations of motions. The influences of thickness variation profiles, boundary conditions and types of
porosity on the vibrational properties of tapered circular plates are also investigated in detail.