System Design - January 2010
Waving goodbye to vibration
Negative-stiffness mechanism or NSM isolators from Minus
K Technology, Inc. Inglewood, Calif., enables laser and optical
instruments (and micro-hardness testers and optical profilers)
to operate under severe vibration that render passive and
even electronic isolators impractical. The isolators can also
independently adjust vertical and horizontal resonant frequencies.
Points to remember
- Good isolators shift system natural frequency as far as
possible from excitation frequency: The former must be no
more than one third excitation frequency.
- Where vibrations are transmitted to equipment through
the floor, handheld or mounted sensors can reveal what kind
of isolation the machine will require.
| This Minus K negative-stiffness
isolation has two column isolators. Horizontal stiffness
approaches zero when the columns are loaded to critical
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