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

Figure 18

The auto-power spectrum curves: the cyan line for base platform, the red line for payload platform under the passive state, the green line for payload platform under the active (feedback only) state, and the blue line for payload platform under the active (AHC) state: (a) X under passive state, (b) Y under passive state, (c) Z under passive state, (d) X under active (feedback only) state, (e) Y under active (feedback only) state, (f) Z under active (feedback only) state, (g) X under active (AHC) state, (h) Y under active (AHC) state, and (i) Z under active (AHC) state.

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