Table 3.
The natural frequencies and damping ratios of the tested pipe.
| Mode Number | Natural Frequency (Hz) | Damping Ratio (%) |
|---|---|---|
| 1 | 74.6 | 0.665 |
| 2 | 209.8 | 0.305 |
| 3 | 410.4 | 0.145 |
| 4 | 670.6 | 0.195 |
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