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) | 0.0022583 | 0.0023742 | 0.001593 | 0.0016005 | (kN/m2) | 1200 | 2400 | 3700 | 4800 |
| (Hz) | 13.2160 | 18.5630 | 22.9094 | 26.0790 | (Hz) | 15 | 19 | 21 | 25 |
| (m) | 0.0015625 | 0.0014709 | 0.0013644 | 0.001361 | (kN/m2) | 6100 | 7300 | 8500 | 9800 |
| (Hz) | 29.3847 | 32.1331 | 34.6638 | 37.2162 | (Hz) | 28 | 31 | 33 | 36 |
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