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

Table 4

Vibration control effect based on the novel active joint in Experiment II.

Experiment II		Amplitude (°)		Major frequency	Current (RMS)
(a)	Without control (kp = 0)	–4.30°–4.33°	Amplitude (°)	0.46 Hz	0 A
				3.90°
	With control (kp = 0.30)	–1.32°–0.93°	Amplitude (°)	0.69°	1.479 A
			Control effect (%)	82.31%
			Control effect (dB)	–15.04 dB
(b)	Without control (kp = 0)	–2.82°–2.81°	Amplitude (°)	0.56 Hz	0 A
				2.46°
	With control (kp = 0.40)	–0.97°–0.91°	Amplitude (°)	0.60°	2.237 A
			Control effect (%)	75.61%
			Control effect (dB)	–12.26 dB
(c)	Without control (kp = 0)	–0.98°–0.90°	Amplitude (°)	0.63 Hz	0 A
				0.62°
	With control (kp = 0.50)	–0.30°–0.29°	Amplitude (°)	0.13°	0.768 A
			Control effect (%)	79.03%
			Control effect (dB)	–13.57 dB