PAL Isolators Membrane Air Spring Isolators
- Standard PAL isolators have vertical natural frequencies from 1.5 to 2.7 Hz
- Natural frequencies to 0.5 Hz can be achieved with custom designed isolators
- Can support payloads from 120 to 100,000 lbs per isolator
- Settling time is minimal at optimum damping and corresponding valve flow
Precision Aire™ leveling PAL pneumatic isolator systems from Fabreeka provide superior low frequency vibration isolation using automatic leveling membrane air springs. PAL isolators are ideally suited for conditions requiring both height control and vibration isolation.
A complete Fabreeka PAL pneumatic isolation system consists of at least three master isolators for three-point level control. Each isolator has an integrated level-control valve that functions as a load sensor and height control. Any number of additional isolators may be added to support the total device weight. Each system comes with a control unit, automatic level control valves, pneumatic tubing and all of the other pneumatic accessories necessary for complete system installation.
PAL air springs respond quickly to changes in load and center of gravity. Deviations from positions once preset are automatically readjusted. Air spring system performance is always a compromise between natural frequency (isolation), level control valve restoring accuracy and settling time.
Special isolators for low frequencies
The horizontal natural frequency of standard PAL air isolators is between 3.0 - 4.5 Hz. To achieve a lower natural frequency, Fabreeka designs special pendulum isolators which can achieve a natural frequency as low as 0.4 Hz. Pendulum air isolators for low frequency vibration isolation require an outer support frame and incorporate three cables or rods to allow the isolator to achieve the low stiffness in the horizontal direction (sway). The lengths of the cables or rods determine the horizontal natural frequency so height is the limiting factor on how low of a frequency that can be achieved.
Fabreeka also designs and manufactures air springs for OEM and special applications which can integrate easily into existing machine designs. Additionally, Fabreeka provides isolation systems for inertia mass isolation, suspended platforms and machine frames to improve stability, while also decreasing the relative height of the isolated device’s center of gravity.