Research Article

Nonlinear Free Vibration Analysis of Axisymmetric Polar Orthotropic Circular Membranes under the Fixed Boundary Condition

Table 2

The frequency under various initial displacements and various pretensions ( ).

(m)0.00225830.00237420.0015930.0016005
(kN/m2)1200240037004800

(Hz)13.216018.563022.909426.0790
(Hz)15192125

(m)0.00156250.00147090.00136440.001361
(kN/m2)6100730085009800

(Hz)29.384732.133134.663837.2162
(Hz)28313336