Active Hybrid Control Algorithm with Sky-Hook Damping and Lead-Lag Phase Compensation for Multi-DOFs Ultra-Low Frequency Active Vibration Isolation System

Table 2

The results of transmissibility in X/Y/Z.

Direction	X		Y		Z
	1.20 Hz	10 Hz	1.19 Hz	10 Hz	1.17 Hz	10 Hz
Passive (dB)	15.67	−31.90	20.79	−31.44	19.98	−34.78
Active (feedback only) (dB)	−5.70	−34.14	−2.27	−37.74	−0.85	−36.38
Active (AHC) (dB)	−8.95	−47.58	−8.38	−44.64	−3.60	−41.14
Decrease (dB)	24.62	15.68	29.17	13.20	23.58	6.36
Attenuation rate (%)	64.31	99.58	61.89	99.41	33.93	99.12
Active effective bandwidth (Hz)	0.25~32.82		0.41~45.74		0.23~14.38