Table 1.
Different natural frequencies of HRG in correspondence with different temperatures.
| Temperature (°C) | Natural Frequency (Hz) |
|---|---|
| −20 | 4,416.97 |
| −10 | 4,421.05 |
| 0 | 4,424.90 |
| 10 | 4,428.56 |
| 20 | 4,432.07 |
| 30 | 4,435.56 |
| 40 | 4,439.20 |
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