Research Article
Measurement-Based Modal Analysis and Stability Prediction on Turn-Milling of Hollow Turbine Blade
Table 1
Dynamic parameters with two methods.
| | Method | First-order frequency (Hz) | Damping ratio | Stiffness (N/m) |
| | Fitting method (P1–P5) | 300 | 0.4289 | 231,730 | | Extremum method (P1–P5) | 370 | 0.3219 | 177,240 | | Fitting method (P6–P10) | 286 | 0.4133 | 64,128 | | Extremum method (P6–P10) | 268 | 0.3994 | 25,598 | | Fitting method (P1–P10) | 308 | 0.4037 | 72,007 | | Extremum method (P1–P10) | 260 | 0.3061 | 20,533 |
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