Research Article
The Impact of Critical Flutter Velocity in Composite Wind Turbine Blade with Prebend Condition
Table 4
Natural frequency of prebend and flat modes.
| | Mode | Prebend blade mode frequency (Hz) | Flat blade mode frequency (Hz) |
| | 1st bending mode | 0.28 | 0.26 | | 1st torsion mode | 0.52 | 0.45 | | 2nd bending mode | 0.99 | 0.90 | | 3rd bending mode | 2.21 | 1.94 | | 4th bending mode | 2.24 | 2.03 | | 2nd torsion mode | 4.07 | 3.68 | | 1st chordwise bending mode | 4.91 | 4.66 | | 3rd torsion mode | 5.61 | 5.24 | | 4th torsion mode | 6.46 | 5.87 | | 2nd chordwise bending mode | 9.23 | 8.38 |
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