Research Article

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

Table 1

The frequency under different initial displacements (  m and  kN/m2).


Rad/s735.605610.032381.648271.525
Hz117.07597.09060.74143.215


Rad/s264.678262.444262.351262.350
Hz42.12541.76941.75441.754