Vibration Analysis has been a developing science since the 1940's, but has only been available to general industry for the last few decades. While many conditions can be diagnosed, the most common are:
The key to determining the root cause of a mechanical problem lies in the analysis of the vibration spectrum. Before a spectrum can be analyzed, the Analyst must know all of the various rotating speeds of the different components of the machine. This requires a stroboscopic inspection which isolates the speed of the part.
Once speeds are known, the Analyst takes a "spectrum" which breaks down and graphs the vibrations by severity (amplitude) vs frequency. When the Analyst can see that the problem is centered about a specific frequency and he knows what is turning at that frequency, he can quickly isolate the root cause of the failure.
For many Vibtech clients, the most powerful and cost effective approach to Vibration Analysis is through a Predictive Maintenance Program.
The Objectives of a Predictive Maintenance Program include:
Under such a program, the severity of vibration readings becomes secondary to the rate of change … it is as important to know how a machine is changing over time as it is to know whether or not a given reading is over or under alarm points. For example, a machine's bearing vibrations may be in ranges which, by themselves, would indicate that it needs immediate replacing. However, when viewed over time, the vibration levels may be changing very slowly and the repair can be more conveniently scheduled. Conversely, readings which are barely in alarm may not seem to be of concern, but the rate of deterioration may indicate that replacement should be made immediately.
All successful Predictive Maintenance Programs have these critical elements:
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