Page 307 - Root Cause Failure Analysis

Glossary 295

eccentricity The distance of the geometric center of a
revolving body from the axis of rotation.
efficiency Ratio of useful energy provided by a dynamic
system to the energy supplied to it during a
specific period of operation.
end play Lateral or axial shaft movement.

entrainment Entrapment of tiny air bubbles in a fluid.
envelope, operating Specifies the physical requirements, dimensions.
and type of coupling needed in a specific
application. Envelope information includes shaft
sizes, orientation of shafts, required horsepower.
full-range of operating torque, speed ramp rates,
and any other data that directly or indirectly
affect the coupling.
event A specific change that occurs at a specified time.
expedite To facilitate or speed up a progress.

extrapolation Making an estimate of an unknown quantity
based on, but outside the range of. known data.
facilitator Someone or something that makes it easier to
accomplish a task.
fan A device, usually consisting of a rotating paddle
wheel or an airscrew, with or without a casing,
for producing currents to circulate, exhaust, or
deliver large volumes of air or gas.
fault event An abnormal system state.
flange Projecting rim of a mechanical part.
flash point The lowest temperature at which vapors from a
volatile liquid will ignite momentarily on the
application of a small flame under specified
conditions.
fluidizer Identical to single-stage, screw-type compressors
or blowers.

forcing function (1) A cause of an event. (2) The cause of each
discrete frequency component in a machine
train’s vibration signature.