Efficient Plant Nov./Dec 2019 - 23

feature | predictive maintenance
sidebands. The analysis considers the vibration level as a function of time, compares
the vibration with known levels of vibration, indicates a change in condition, and
predicts the best time to take the equipment
down for repair.
Frequency analysis identifies bearing
components. Every cause of bearing failure-ranging from lubrication problems,
contamination, and misalignment to poor
fit and temperature-produces an increase
in bearing vibration. Each element within
a bearing has an individual characteristic
frequency. While vibration monitoring is
one method for identifying bearing faults,
frequency analysis increases the opportunity to detect faults at an earlier stage.
High-frequency resonance analysis cuts
through machine noise that can mask vibrations that indicate bearing failure. Envelope
analysis goes further than vibration or
frequency analysis by extracting periodic

impacts of random noise from a rolling
bearing. Using historical data that shows
the natural frequencies of the outer and
inner rings, envelope analysis looks for the
high-frequency burst that occurs when the

Using PdM,
reliability teams
gain the time
needed to order
parts and arrange
for a repair.
bearing hits a fault and then isolates that
burst in time. Each impact of a bearing on
the fault produces another burst of energy.
The use of high-pass and low-pass filters
generates an envelope of the signal that
aligns with the repetition rate of the defect.

BENEFIT FROM PDM
Because PdM solutions continuously monitor the condition of equipment as it operates, reliability teams gain the time needed
to order parts and can arrange for a repair
or replacement during a time that has the
least impact on operation. PdM strategies
detect degradation before the failure occurs
and provide the trending information
needed to systematically plan for a repair.
With maintenance occurring only when
needed, and well before any breakdown
happens, significant gains in efficiency can
be realized. EP
Justin Lesley is Industry 4.0 innovation manager at Motion Industries Inc., Birmingham,
AL (motionindustries.com). Scott Moeller is
product sales manager of bearings, seals, and
accessories at Motion Industries. For more
information, visit MotionIndustries.com/
efficientplant or bearings.com.

Pruftechnik

SERIES TECHNOLOGY
NOW

AVAIL ABLE

HAZARDOUS

FOR

ENVIRONMENTS

PRUF TECHNIK , Inc . | Philadelphia | Montreal | PRUF TECHNIK .COM | 1.877.778. 3832 | info.na@pruf technik.com

NOV/DEC 2019

EFFICIENTPLANTMAG.COM |

23


http://www.motionindustries.com http://www.MotionIndustries.com/efficientplant http://www.bearings.com http://www.PRUFTECHNIK.COM http://www.PRUFTECHNIK.COM http://www.technik.com http://www.EFFICIENTPLANTMAG.COM

Efficient Plant Nov./Dec 2019

Table of Contents for the Digital Edition of Efficient Plant Nov./Dec 2019

Efficient Plant Nov./Dec 2019 - 1
Efficient Plant Nov./Dec 2019 - Cover1
Efficient Plant Nov./Dec 2019 - Cover2
Efficient Plant Nov./Dec 2019 - 1
Efficient Plant Nov./Dec 2019 - 2
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Efficient Plant Nov./Dec 2019 - Cover3
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