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Vibration Tips

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iPresentation Online Training Sessions

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.

 

Articles

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.


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)


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)


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)


The Importance of Standard Test Conditions – Test Speed
By Alan Friedman, DLI Engineering Corp.

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)


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)


Identifying the Motor Rotor Bar Related Peaks in a Spectrum
By Alan Friedman, DLI Engineering Corp

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)


Measuring Shock Pulse another approach to Front Line Condition Monitoring
A Look into Pulse Theory - And Why the Walls of Jericho Fell
e-Book Request: Beginner’s Guide to Machine Vibration
Using Vibration Monitoring Equipment For OTHER Functions
Pulse Theory (200k pdf)
Condition Monitoring Performance Objectives: Key To Improvement
Vibration & Ultrasound Technologies: A Possible Integrated Inspection Tool?
Understanding The Basics Of Balancing & Measuring Techniques (328k pdf) 
Field Guide to Vibration Analysis (661k pdf)  
An Introduction to Time Waveform Analysis (971k pdf)
Remote Machinery Condition Monitoring Using Wireless Technology and the Internet (516k pdf)  
Vibration Spectrum Analysis Book Excerpt (234k pdf)
Future of Condition Monitoring, Computerized Maintenance and Plant Reliability & Maintenance (38k pdf)
Vibration Analysis in the 21st Century (25k pdf)
A Vision for Industrial Machine Condition Monitoring (27k pdf)
The Future of Condition Monitoring: A View from the CBM Laboratory at the University of Toronto, Canada (19k pdf)
e-CM (Condition Monitoring) (39k pdf) 
Condition Monitoring for Cooling Tower Fans (25k pdf) 
Overhead Crane Monitoring Application (509k pdf) 
What is Shock Pulse Method? (78k pdf)
Finding your watch and losing your bearings (242k pdf) 
Q&A on CD Based Vibration Training

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