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Integration
The time‑based process of converting acceleration and
velocity to velocity or displacement
in/sec, ips
Abbreviations for inches per second, a measure of velocity
Mass
The measurement of body resistance to acceleration;
proportional to, but not equal to, weight (mass = weight/
gravity)
Measurement
Point
A location on a machine or component where all
subsequent measurements should be made for accurate
comparison
Mechanical
Impedance
Ratio of applied force to resulting velocity during simple
harmonic excitation
Overall
The amplitude of vibration within a specified frequency
range
Peak Value
The absolute value zero to the maximum excursion on a
dynamic waveform; also true peak and zero‑to‑peak
Periodic
Monitoring
Measurements recorded at intervals of time
Piezoelectric
A material in which electrical properties change when
subjected to force
Process
Measurements
Variables such as temperature, pressure, speed and flow
used to assess internal conditions of efficiency
Radial
Direction perpendicular to the shaft centerline
Repeatability
A measure of deviation between successive measurements
made under the same conditions
RMS
Peak vibrations x 0.707 (in/s or mm/s)
Rolling Element
Bearing
A bearing consisting of balls or rollers operating between
fixed and rotating races
Route
A sequence of measurements arranged for convenience
during data acquisition
Sensitivity
Used to describe a transducer’s electrical output for a unit
variation of the mechanical quantity measured
