17
Section 3
Operation
The Stabilizer™ Isolators provide one of the best methods of vibration
isolation for critical applications. The system operates on the principle of
air pistons, which are equivalent of soft springs. The main advantage of the
Newport system over other designs are low vertical resonant frequency
with low amplification at resonance (Q) and a Pendulum
TM
horizontal
decoupling system for effective isolation from low amplitude vibration.
Newport optical tables provide a working surface that is statically rigid
with high internal tuned damping for high dynamic rigidity and minimal
response to environmental disturbances.
The leveling valves provided with the system control the height of the table
to within
±
0.01" (0.3mm) accuracy. This tolerance is adequate for most
applications. More accurate valves are available for specialized
applications.
Once the system is assembled and the table floating, it is possible to make
minor adjustments to suit your individual needs. These adjustments
involve the system air pressure, the control arms, and needle valves.
Warning
Once the table is floating, keep fingers away from the area between
the centering guide and outer clamp of the isolators. Any object
between these points may be caught if the table load or air supply
changes, causing personal injury.
A. Stabilizing high center-of-mass loads: If your load has a high center of
mass or if the load is particularly heavy, the table may oscillate. In
this case, lower the system pressure or close the needle valves
slightly. This may improve stability and reduce the oscillation or
“hunting”.
A rule of thumb for determining high center of gravity (C-G) system
stability is shown in Figure 3.1. If the combined center of gravity of
the payload and table top is within the “stable region”, the system will
be stable. If the combined C-G is inside the “may be stable region”,
the system may be stable. If the combined C-G is outside both
regions, the system will probably be unstable.
Principles of
Operation
3.1
Performance
Adjustments
3.2
Summary of Contents for IPV
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