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Good Vibrations when a trainer comes your way
Vibrations in machines are usually
an undesirable and disruptive oc-currence that impinges on
ma-chine reliability and service life,and reduces the quality of
prod-ucts produced or processed onthe machines. Yet every
machineand drive also generates vibra-tions that the user,
manufactureror operator can take advantageof for purposes of
process moni-toring and condition diagnosis.Its much like a general
checkup
with a physician. Electrodes areaffixed to certain points on
thebody and an electrocardiogram ismade. The cardiologist
evaluatesthe heart vibrations over timeand makes a diagnosis of
thepatients current state of health.Before suitable diagnostic
proce-dures and measurement pointscan be selected, the
followinginformation on the machineshould be available:
structural design interaction between individual
components characteristic diagnosis param-
eters and their threshold values potential faults and mecha-
nisms that may lead to damageEvery rotating machine compo-nent,
be it a roller bearing, gearpair or shaft, generates more orless
synchronous vibrations andhas a natural vibration frequency,
which at the begining of thecomponents service life has ahealthy
amplitude and shape.Incipient damage such as wear,imbalance and
misalignment al-ters the excitations at this fre-quency or creates
new excita-tions. Often, the excitation ampli-
tude will increase. Modern vibra-
tion analyzers use frequency, or-der and phase analyses as well
ascepstra to evaluate these chang-es. Each ofthese methodshas its
limita-tions and mustbe configuredfor the applica-tion at hand,
atask that gen-erally requires
i n - d e p t hknowledge ofthe machine.Seminars arean excellent
way to gain a generalidea of the available proceduresand diagnostic
methods. Themost effective approach is tohave a trainer join you
onlocation.As you introduce Condition Mon-itoring to your
maintenance pro-
gram, PRFTECHNIK will provideongoing support as well as
train-ing of your future specialists.For example, the above
illustra-tion shows the measurementpoint locations on a
conveyordrive. Togetherwith the PRF-TECHNIK train-er, you will
de-velop diagnos-tic strategies
on the basis ofthis diagram,lay down thecorrespondingroutes
andprogram themeasurementfunctions into
the VIBXPERT FFT data collector
and vibration analyzer. Bench-mark measurements are thentaken
and jointly evaluated. Po-
tential faults and their conse-quences are discussed and
theresults are documented in aninitial report.A follow-up service
takes place 3to 6 months later. At that time,the measured results
will be eval-uated and the machines are in-
spected jointly if necessary.Condition-based maintenance
isbecoming a reality.
Order numbersDIC 2.100 Introduction to CM Programs (Start-Up
Service)DIC 2.200 Consultation and Diagnostic Service (Follow-Up
Service)DIC 2.300 Customized In-House Training
PRFTECHNIKCondition Monitoring GmbH
Oskar-Messter-Strae 19-21D-85737 Ismaningwww.pruftechnik.comTel:
089 99 616-342Fax: 089 99 616-300eMail:
[email protected]
Visit us at www.pruftechnik.com
Cover photo appears with the kind permission of the Apotheken
Umschau; Verlag Wort & Bild
C
opyright2005PRFTECHNIKAG
PrintedinGermanyVIB9.1
10-3D
Productive maintenance technology
