Research Article
Two-Degree Vibration Analysis of a Horizontal Axis Turbine Blade by Finite Differential Methods
Table 2
Natural frequencies of blades.
| Rotating speed (rad/s) | 0 | 0.8 | 10 | 30 |
| ω1 (FEM) | 0.3875 | 0.4256 | 1.5765 | 3.3946 | ω1 (FDM) | 0.3859 | 0.4215 | 1.5552 | 3.2976 | ω2 (FEM) | 1.2306 | 1.2393 | 2.2422 | 3.4022 | ω2 (FDM) | 1.2291 | 1.2356 | 2.1287 | 3.3486 | ω3 (FEM) | 2.4218 | 2.4488 | 4.7605 | 9.0082 | ω3 (FDM) | 2.3536 | 2.3214 | 4.4561 | 8.6540 | ω4 (FEM) | 4.3346 | 4.3503 | 5.6395 | 12.039 | ω4 (FDM) | 4.2369 | 4.5123 | 6.1420 | 11.204 | ω5 (FEM) | 7.3653 | 7.3922 | 10.498 | 18.218 | ω5 (FDM) | 7.4141 | 7.4345 | 10.785 | 17.214 | ω6 (FEM) | 10.549 | 10.555 | 11.365 | 20.293 | ω6 (FDM) | 10.985 | 11.241 | 11.754 | 22.314 |
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