Fig. 1. Principle diagram of axially hydraulic support

Fig. 2. System composition of each hydraulic zone

Fig. 3. Block diagram of control system

Fig. 4. Step response curves. (a) Load disturbance; (b) external disturbance

Fig. 5. Position error curves of primary mirror. (a) Without controlling; (b) with controlling

Fig. 6. Tilt angle and tilt angle velocity

Fig. 7. Position error curves of primary mirror in the case of sinusoidal motion of tilt axis