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All PdM-2008 attendees
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Win an
Alienware Laptop
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| Predictive Maintenance
Conference & Expo |
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NEW!
iLearnLab at PdM-2008
Reliabilityweb.com,
Uptime Magazine and Mobius Institute have teamed up to add an
intermediate to advanced vibration analysis technical program to
PdM-2008 in the iLearnLab at the Qwest Center.
The iLearnLab
sessions are synchronized with the learning zone tracks and
solutions & innovation track at PdM-2008 making it a perfect choice
for those with experience looking for deeper knowledge.
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| All PdM-2008 and
LubricationWorld participants are also encouraged to visit the iLearnLab
during break and expo schedules to take part in hand's on self guided
vibration and alignment courses using course material and simulations from
the world famous iLearnVibration and iLearnAlignment by Mobius.
10 Computers will be set up for
your to experience these powerful courses and simulations at PdM-2008 or you
can bring your own laptop (Windows) to try these products on
your own.
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iLearnLab Schedule and Session Abstracts
Tuesday September 16
Session A
10:15 am – 11:00 am
Generating Alarms with Statistics: Let your Machines set their own Alarm
Limits
by Jason Tranter, Mobius Institute
In an ideal world, you could set alarm limits for all of the vibration data
you collect and you would only get ‘exceptions’ when there really was a
problem, and you would never have a problem without being warned. Sounds
great, but for most people it is an unrealistic goal. In this presentation
you will learn about a way to set alarm limits statistically; in essence,
the machine sets its own alarm limits. This method utilizes previous
readings to evaluate how the machine normally vibrates and then establishes
alarm limits accordingly. After reviewing the current alarm setting methods
(and highlighting their weaknesses), you will learn how this method works
via animated software simulators. These simulators demonstrate how the
statistical calculations are performed using real machine data. After this
presentation you should be able to set up alarms statistically in your own
database.
Session B
11:15 am – 12:00 noon
Understanding the Vibration Patterns Generated when Machines are Misaligned
by Walt Barringer, Mobius Institute
A large percentage of machines are misaligned; either because they were not
correctly aligned in the first place, or because thermal growth (or
foundation problems) caused the machine to move afterwards. This
presentation will quickly review the terms “offset” and “angular (gap)”
misalignment, and then explore how the vibration patterns generated. Using
a new iTeachVibration alignment 3D simulator, we will explain (and
demonstrate) exactly why we see the classic vibration patterns (and why
sometimes you do not see those patterns). We will also demonstrate how
phase readings can be used to diagnose misalignment.
Session C
1:15 pm– 2:15 pm
Case study: I have a two-channel vibration analyzer, so what can I do
with it?
by Bill Kilbey, Mobius Institute
Two channel vibration analyzers are now commonplace, but few analysts know
how to fully utilize their capabilities. This presentation, with two case
studies, will demonstrate how cross-channel phase measurements and Bodé
plots can be used to diagnose problems such as misalignment, imbalance and
structural looseness. Using the iTeachVibration phase analysis and dynamic
testing simulators you will learn how to perform the tests and better
understand what you are attempting to learn from the machine.
Case study: The first motor and compressor exhibited symptoms that made
spectrum analysis alone inconclusive. A quick setup and check with a
two-channel vibration analyzer confirmed the diagnosis.
Case study: The second case involves a motor and pump in a new installation
with high vibration. Cross channel phase and Bodé plots helped confirm the
diagnosis.
Chill Out Session (Cold beer served)
4:00
– 4:45 Machines behaving badly
by Jason Tranter, Bill Kilbey,
Walt
Barringer,
Mobius Institute
In
this relaxed session we’ll go through a number of stories about machines
that went “bang!”, and creative solutions to machine fault
conditions. Of course, we should not laugh at other people’s misfortunes,
and we can learn a great deal from these incidents - but we can be happy
that they did not happen to us!
Wednesday September 17
Session D
8:00 am – 8:45 am
Understanding machine dynamics: resonance, phase shifts and mass, stiffness
and damping by Jason Tranter, Mobius Institute
Resonance, mass, stiffness, and damping may sound like terms that should
remain in university lectures. But did you know that the machine dynamics
affects you whenever you take phase readings (especially when balancing),
and rotor dynamics are very important to anyone with turbines or large
compressors. What’s more, every machine you monitor is affected by
resonance; resonance related problems are causing you reliability
problems in more cases than you probably realize. So this presentation will
explain what resonance is, how the vibration amplification and frequency are
affected by the mass, stiffness and damping, and it will demonstrate how you
can use this information to improve reliability. The good news is that you
will not see a single equation; you will learn about these concepts via the
iTeachVibration animated software simulators – you may be surprised by how
much you learn.
Session E
10:00
am – 10:45 am
Diagnosing Faults on AC Induction Motors using Vibration Analysis and Motor
Current Analysis
by
Bill Kilbey, Mobius Institute
Induction motors are the workhorse of industry, so it pays to minimize
failures. In addition to fault conditions that are common to all rotating
machinery, induction motors have their own range of failure modes that can
be detected and diagnosed with vibration analysis and motor current
analysis. In this presentation we will use an iTeachVibration motor
simulator to discuss the failure modes and demonstrate why the vibration and
current changes in characteristic ways. You will learn how to detect
broken rotors bars, soft foot, eccentric rotors, bent shafts and a range of
other conditions. And you will understand why we see vibration at 120 Hz,
why we see pole-pass sidebands, and a number of other characteristic fault
conditions.
Session F
11:00 am – 11:45 am
Case Study: 1000 HP, 3585 RPM Sleeve Bearing Motor Problems after a Rebuild
by
Bill Kilbey, Mobius Institute
This case history will show the importance of acceptance testing and
demonstrate why it is important to train and certify rebuild shop
personnel. The 4160 VAC motor in question drives a compressor in a large
industrial facility. The motor was taken out of service for low resistance
to ground readings from a “Motorsafe” device installed to monitor the
motor. The motor was sent to the repair shop for relatively minor cleanup
and winding treatment and reassembly. The motor was test-run at the shop,
but the rebuild shop personnel were not properly trained in analyzing
vibration and let the motor ship back to the customer with abnormal
vibration readings.
The customer installed the motor and noted high vibration readings. The
analysis reveals problems with the bearings wiping Babbitt. The motor was
then sent back for correction. This resulted in much unnecessary downtime
and rework. Proper training and attention to detail would have saved many
thousands of dollars.
Back to sessions |
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