Multidimensional System Identification and Active Vibration Control of a Piezoelectric-Based Sting System Used in Wind Tunnel

Table 5

Different damping ratios.

Control state	Damping ratio in pitch direction (%)	Damping ratio in yaw direction (%)
Without control	0. 11	0.15
With control,  = 0.20	0.64	0.65
With control,  = 0.15	0.83	0.78
With control,  = 0.10	0.92	0.91
With control,  = 0.05	1.04	1.06