Active Vibration Control of a Large Flexible Appendage Using a Novel Joint Mechanism

Table 7

Efficiencies of vibration control in the passive damping-based Experiments III and IV.

Experiments		Amplitude (°)		Major frequency		Current (RMS)
III	Without control (kp = 0)	–5.83°–4.76°	Amplitude (°)	0.08 Hz	0.17 Hz	0 A
				1.37°	1.06°
	With control (kp = 0.2)	–2.18°–1.63°	Amplitude (°)	0.67°	0.43°	1.470 A
			Control effect (%)	51.09%	59.43%
			Control effect (dB)	–6.21 dB	–7.84 dB
IV	Without control (kp = 0)	–4.66°–3.51°	Amplitude (°)	0.08 Hz	0.16 Hz	0 A
				1.21°	0.65°
	With control (kp = 0.2)	–1.35°–1.13°	Amplitude (°)	0.61°	0.24°	1.058 A
			Control effect (%)	49.59%	63.08%
			Control effect (dB)	–5.95 dB	–8.65 dB