Table 1 FEM computed and experimentally identified modal parameters
Modal pair | FEM computations | Experimental modal identification | Rel. Diff ERA vs FEM (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|
Mode shapes | Frequency (Hz) | Ratio (fn/f2) | Frequency (Hz) | Ratio (fn/f2) | Damp (%) | ||||
General xy view | zx view | ||||||||
1st family | 2nd family | ||||||||
1 (Hum) |
|
|
| 1487.6 | 0.5133 | 1487.6 | 0.5139 | 0.02 | 0 |
1489.0 | 0.5137 | 1490.8 | 0.5150 | 0.02 | 0.12 | ||||
2 (Prime) |
|
|
| 2895.2 | 0.9989 | 2891.8 | 0.9989 | 0.03 | 0.12 |
2901.6 | 1.0011 | 2898.1 | 1.0011 | 0.02 | 0.12 | ||||
3 (Tierce) |
|
|
| 3597.6 | 1.2413 | 3593.8 | 1.2414 | 0.04 | 0.11 |
3599.1 | 1.2418 | 3594.0 | 1.2432 | 0.04 | 0.14 | ||||
4 (Quint) |
|
|
| 4831.1 | 1.6668 | 4854.4 | 1.6688 | 0.02 | 0.48 |
4841.4 | 1.6704 | 4855.9 | 1.6774 | 0.03 | 0.30 | ||||
5 (Nominal) |
|
|
| 6057.6 | 2.0900 | 6048.2 | 2.0925 | 0.03 | 0.16 |
6060.4 | 2.0909 | 6060.8 | 2.0934 | 0.03 | 0.01 | ||||
