Flap/Lag Stall Flutter Control of Large-Scale Wind Turbine Blade Based on Robust H₂ Controller

Table 2

The values of and 1st frequencies (Hz) versus ply angles (°).

Ply angles		1st frequency
0	0.0070	12.815
15	0.0135	27.106
30	0.0544	78.005
45	0.0839	98.366
60	0.0727	66.442
75	0.0523	32.636
90	0.0433	20.531