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A New Introduction to
Vibration Analysis
An iPresentation Tutorial by Jason Tranter of Mobius
iLearninteractive
This 18 minute iPresentation tutorial provides an
excellent introduction to vibration analysis. It
replaces the original and very popular presentation from
the same author. You will learn how vibration is
measured and discover how vibration can be used to tell
you about the condition of a machine. We introduce high
frequency methods such as shock pulse and PeakVue; we
touch on the time waveform; and then offer a detailed
description of the vibration spectrum, with the aid of
some basic animations. This presentation is ideal for
the person who needs to quickly increase their
understanding of vibration analysis.
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The Challenges of Automated Spectral Analysis -
Reflections on
eighteen years of development by
Jason Tranter,
Managing Director,
Mobius Software P/L, Melbourne, Australia
For the past eighteen years I have been
writing vibration analysis software – first my own
Australian company ARGO, then for DLI
Engineering in the United States, and now I am at it
again for my own company, Mobius. The goal has
always been to create software that can analyze spectra
and tell the user what may be wrong with the machine. It
has been an interesting journey, and this paper will
share some of my experiences.
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Belt Faults
by L. Robert Pyle of Systemaitec
Belt drives can cause many strange looking spectra. To
analyze and troubleshoot belt drives it is imperative to
have a high resolution analyzer. I use one with 3200
lines of FFT. To those still using 400 lines that might
seem like overkill. This paper, though, will show the
necessity of high resolution when troubleshooting many
vibration problems.
Belt and sheave problems can come in many forms. A bad
belt seam or a dished belt, out of round sheaves on
either the driver or driven shaft or both, angular
misalignment of the sheaves, axial misalignment of the
sheaves and any combination of any or all of the above.
When faced with what appears to be a belt problem,
realign the sheaves axially and angularly, then take
your readings again.
More...Click here to read Belt Faults (433k pdf)
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The Truth Behind Misalignment Vibration Spectra of
Rotating
Machinery
by S. Ganeriwala, S. Patel, H.
A. Hartung of SpectraQuest, Inc
Misalignment is probably
the most common cause of machinery malfunction.
Considering the importance of alignment, the vibration
spectra of alignment is not well documented. Various
authors have reported different spectra. The goal of
this research was to determine the unique vibration
signature for misalignment at varying operating and
design conditions such as speed, type and level of
misalignment, coupling types and machinery dynamic
stiffness.
More...click here to read
The Truth Behind Misalignment Vibration Spectra of
Rotating Machinery (282k pdf)
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Monitoring the Performance and Health of a Shredder
Plant
by:
Dr. Jon Tapson, Motornostix
USA
A Web-based Online
Monitoring System
Recently, a major
shredding plant in California (Simsmetals’ Redwood
plant) fitted their Alstom motor and Texas Shredder mill
with a Motornostix web-based online condition monitoring
system. The Motornostix system makes use of a local data
logger called a Canary unit. The Canary units are
locally networked to a PC, which acts as a bridge to the
Internet. The data gathered by the Canary is hosted on a
central database from where it can be served to users
via a simple web browser interface. Motornostix has a
central database in Cincinnati which stores data from
customers in the USA, UK and Australia.
More...Click here to read Monitoring the Performance and
Health of a Shredder Plant (348k pdf)
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To illustrate the
importance of standard test conditions, we can look at
the simple case of attempting to diagnose a rotor
imbalance. If an imbalance is present, we expect to see
our vibration levels rise at the run speed of the
machine in all directions radial to the shaft (in other
words in the vertical and horizontal directions). To
visualize this, consider a washing machine on the spin
cycle with all of the clothes bunched up on one side.
The more clothes that are bunched up on one side, the
more the machine will rock back and forth as the weight
spins around. The weight will spin around at the same
speed as the shaft and thus the frequency of this
vibration will be at the shaft rate.
More...Click here to read
The Importance of Standard
Test Conditions – Test Speed (20k pdf)
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Standardization of Absolute Vibration Level and Damage
Factors for Machinery Health Monitoring
by: Kumaraswamy. S., Rakesh. J and Amol Kumar Nalavade
An
attempt has been made to study the vibration level of
various machine tools to explore the possibility of
establishing the standard vibration level. Till today no
vibration standards are available for determining the
acceptable vibration level for specific machine tools.
However there are some standards available that gives an
indication of machinery health based on overall
vibration level like ISO 2372 (RMS velocity in the
frequency range 10 Hz to 1kHz) and Canadian
specifications (RMS velocity in the frequency range 10Hz
to 10kHz). But these standards are made for general
purpose machinery like pumps, motors, generators and so
on.
The
present study is aimed at establishing the vibration
standards for precision machine tools. The machine
tools are first segregated and then their vibration data
are analyzed for determining the normal vibration level
and damage factors (DF). After refining and fixing the
vibration standards obtained, they can be used to assess
the machinery health.
More...Click here to read Standardization of Absolute
Vibration Level and Damage Factors for Machinery Health
Monitoring (68k pdf)
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The motor
bar peak in a spectrum appears at a frequency equal to
the number of motor bars multiplied by the shaft rate of
the machine. Although initially, most analysts will have
no idea how many motor bars there are, identifying the
peak that relates to the motor bars is fairly simple to
accomplish. The reason for this is that the motor bar
peak will have peaks on either side of it, spaced 120 Hz
away (100 Hz where electrical line frequency is 50Hz).
These peaks are termed “sidebands” and they are caused
by the modulation of the motor rotor by the
electromagnetic forces that cause the motor to spin.
More...Read
Identifying the Motor
Rotor Bar Related Peaks in a Spectrum (89k pdf)
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Measuring Shock
Pulse another approach to Front Line Condition Monitoring |
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A Look into Pulse Theory -
And Why the Walls of Jericho Fell |
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e-Book Request:
Beginner’s Guide to
Machine Vibration |
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Using Vibration Monitoring Equipment For OTHER Functions |
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Pulse Theory (200k pdf) |
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Condition Monitoring Performance Objectives: Key To
Improvement |
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Vibration & Ultrasound Technologies: A Possible
Integrated Inspection Tool? |
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Understanding The Basics Of Balancing & Measuring
Techniques (328k pdf)
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Field Guide to Vibration Analysis (661k pdf)
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An Introduction to Time Waveform Analysis (971k pdf)
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Remote Machinery Condition Monitoring Using Wireless
Technology and the Internet (516k pdf) |
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Vibration Spectrum Analysis Book Excerpt (234k pdf) |
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Future of Condition
Monitoring, Computerized Maintenance and Plant
Reliability & Maintenance (38k pdf) |
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Vibration Analysis in the 21st Century (25k
pdf) |
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A Vision for Industrial Machine Condition Monitoring
(27k pdf) |
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The Future of Condition Monitoring: A View from the CBM
Laboratory at the University of Toronto, Canada (19k pdf) |
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e-CM (Condition Monitoring) (39k pdf) |
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Condition Monitoring for Cooling Tower Fans (25k pdf) |
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Overhead Crane Monitoring Application (509k pdf) |
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What is Shock Pulse Method? (78k pdf) |
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Finding your watch and losing your bearings (242k pdf) |
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Q&A on CD Based Vibration Training |
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Condition Monitoring Discussions |
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