A.V.S Vibration Information


	"Keeping the gears of industry turning"

Vibration Information

What is Vibration ?

Vibrations occur naturally in machinery, caused by the rotation of its components. Each component has its own frequency or frequencies and this is dependant upon the running speed of the machine. This vibration can be used as an indicator of machinery condition. When the level of vibration increases or becomes excessive there is usually some mechanical reason. These vibrations are compounded into a resultant cacophony of noise.

What causes Vibration?

There are literally hundreds of specific problems that can cause a machine to exhibit excessive vibration. To locate the root cause of vibration an analysis of the vibration is required. The forces that cause vibration are usually generated through the rotating motion of the machine’s parts or electrical supply frequency. When a fault condition occurs the problem will exhibit characteristics that are directly related to these frequencies. The following is a list of common “forcing frequencies”.

· Rotational Shaft Speeds

·        Electric Motor Rotor Bar Frequencies
·        Electrical Supply Frequencies
·        Gear Meshing Frequencies
·         Impeller Blade Pass Frequencies
·         Bearing Frequencies

o Fundamental Train Frequency

o Ball Spin Frequency

o Ball Pass-Inner Race Frequency

o Ball Pass-Outer Race Frequency

·         Belt Frequencies
·         Stator Pole Pass Frequencies
·         Oil Whirl Frequency in Plain Bearing Machines
·         External (Loading) Frequencies
·         Random Vibration
·         Natural Frequencies

Vibration monitoring

The purpose of vibration monitoring is to establish the running condition of machinery in a fashion which is objective and scientific. While experienced opinions as to how a machine is operating is helpful, these opinions do not take the place of scientific "metering" to obtain the true condition of rotating machinery. Also, there is no better criteria for operational soundness in rotating machinery than by how much it vibrates.

Vibration Analysis

Using a vibration analyzer, and some skill, personnel can pinpoint the causes of rough machinery condition. Such problems as rotor imbalance and misalignment make up a great proportion of mechanical deficiencies and can be identified and rectified. Other problems such as bearing wear are not only detected, but also qualified as to the severity of wear. In many instances, a historical case study can prognose the remaining life of bearings so that scheduled repairs can be prioritized.

Corrective Measures

By far, the most predominant utilization of vibration corrective measures are that of balancing. More than a trial and error method of achieving dynamic trueness, balancing with an analyzer is a stepped process. It is one of very few techniques where machinery which is deemed "rough" can be corrected in place, without disassembly and where the results can meet any level of precision in almost all cases. This is especially helpful when one considers that the same analyzer pinpoints imbalance conditions so that the cause and cure are achieved with the same instrument

Key Benefits of Vibration Monitoring and Analysis

Reduce maintenance costs
Increase equipment reliability
Reduce equipment downtime
Extend the service life of each machine in the program
It is a non-destructive test
It does not affect machine operation
It does not interfere with production scheduling
The data is quantitative and readily lends itself to computer trending
The cost of this entire procedure can easily be recouped from the prevention of a catastrophic failure of JUST ONE MACHINE

Contact Information

Telephone:

+27 0861 ALIGN1 Alt (012) 661 7844

FAX :

+27 0866709045

Postal address:

PO Box 5238 , The Reeds , Gauteng, South Africa, 0158

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