The topic of "Vibration" may
be divided into
three fields; a- perturbations in structures that annoy occupants, b-
vibrations in machinery that can be damaging or disabling and c-
vibrations by machinery or activities that travel to other areas.
a- We measure the floor
vibrations in structures with a seismic sensor capable of detecting
vibration well below the human sensory threshold, measured in 1/3
octave bands from 1 Hz through 10,000 Hz if necessary, likely to be of
concern for the operation sensitive equipment such as scanning electron
microscopes and magnetic resonance imaging (MRI) devices. Where such
building floor vibrations are greater than the human sensory threshold
(above .001 inches per second RMS) concern is often expressed regarding
residential and office workplace comfort. We often measure greater
vibrations with a small accelerometer, then analyze those data
according to frequency and amplitude, often searching for the vibration
source if not obvious, and recommend mitigation measures.
b- "Balancing" limit criteria,
often expressed - say as 0.05 inches per second or 1 mm/second - for
operating machinery is often used for preventive maintenance or as a
troubleshooting measure. Once identified as being suspect, the
manufacturer can provide remediation measures. We can measure and
such vibrations. Many firms and technicians have vibration meters to
identify these situations. We are often consulted over concern that
these common unbalance vibrations are seriously disturbing nearby
persons or sensitive equipment. We measure these vibrations and their
energy spectrum, relate these to the disturbed entities, and then we
provide remediation measure recommendations such as more vibration
isolation or that preventive maintenance be applied where necessary.
c- Similar to b- We are often
consulted over concern that vibrations from nearby or unknown sources
are seriously disturbing nearby persons or sensitive equipment. We
measure these vibrations, relate them to surrounding entities such as
nearby machinery, or road traffic or rail traffic, and then provide
remediation measure recommendations such as isolation either of the
disturbed entity, or the emitting source such as HVAC machinery.
isolation/snubber installation labor and maintenance) usually drive the
Last updated 10-Jun-2010.
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