Active electronic-pneumatic vibration isolation with 3 or 6 degrees of freedom.

With the AIS™ Active Isolation System, active control significantly improves vibration isolation by suppressing amplification at resonance without degrading properties at higher frequencies. In this process, the AIS™ maintains its active properties over the entire working travel (stroke) of the air spring.
In dynamic applications, the active response of the system ensures reduced deflection times after excitation. The system is consequently quicker at rest and in measuring tasks with positioning movements achieves shorter cycle times than passive systems.
The special feature of the system is the pneumatic actuator principle, which covers a wide dynamic working range – even in the case of very heavy machines. Control bandwidths up to the 300 Hz range are possible due to extremely fast-reacting valves. The system reacts in real time and consequently so quickly that its performance is in no way inferior to that of a vibration isolation system with complex feed-forward signal control.

The AIS™ can be used with three or six actively controlled degrees of freedom (DOF). The system can be adapted to the different application requirements. Three vertically aligned controllers are used with three regulated degrees of freedom, which actively regulate the vertical position and the rotations around both horizontal axes. The other degrees of freedom are passively reset by the membranes.
With the use of 6 controlled degrees of freedom, the HAB horizontal air springs are also used. In this configuration, six controllers are arranged both vertically and horizontally.

Additional BiAir air springs rotated by 90° are used in the AIS™ High Performance version to generate higher horizontal counter forces. The horizontal HAB air springs act purely as air bearings. This eliminates even minor friction effects and influences of the membrane.