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

Table 3

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

Experiment I		Amplitude (°)		Major frequency	Current (RMS)
(a)	Without control (kp = 0)	–2.40°–2.39°	Amplitude (°)	0.26 Hz	0 A
				2.26°
	With control (kp = 0.3)	–0.27°–0.31°	Amplitude (°)	0.16°	0.431 A
			Control effect (%)	92.92%
			Control effect (dB)	–23.00 dB
(b)	Without control (kp = 0)	–11.79°–12.26°	Amplitude (°)	0.26 Hz	0 A
				11.69°
	With control (kp = 0.3)	–0.43°–0.57°	Amplitude (°)	0.28°	0.776 A
			Control effect (%)	97.60%
			Control effect (dB)	–32.41 dB
(c)	Without control (kp = 0)	–14.33°–15.28°	Amplitude (°)	0.26 Hz	0 A
				13.67°
	With control (kp = 0.2)	–0.67°–1.06°	Amplitude (°)	0.66°	1.093 A
			Control effect (%)	95.17%
			Control effect (dB)	–26.32 dB