everything that rotates
                        needs to be balanced


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Vibration Information for rotating machinery applications.


Transducer Mounting

Friday, June 10, 2011

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Vibration Measurements: Recognizing Bad Data

Monday, June 06, 2011

When taking vibration measurements it is important to verify that the data does not contain errors. Bad data can be caused by several factors including: poor cable connections, faulty sensors, mechanical and thermal shocks to the sensors, improper mounting conditions, and settling time.  Most data collection instrumentation provides a readout of the vibration signals and a visual check of the data can usually determine if there are any measurement errors. Errors usually cause specific, recognizable patterns in the time waveform and spectral data. Read More

Phase and Vibration

Friday, June 03, 2011

Phase measurement is a very powerful tool in vibration analysis. Phase is a relative position of two or more signals. Let’s take an example of pendulums. Two pendulums are not “in phase” if one of them is going the other direction or not in harmony with with the other one. The same scenario applies to rotating machinery. Read More

Filters in The Field of Vibration

Friday, May 27, 2011

vibration filter
Top left: Low pass filter. Top right: High pass filter.
Bottom left: Band pass filter. Bottom right: Band stop filter. Read More

Fundamentals of Vibration: Time Domain

Friday, May 20, 2011

Rotating machines such as fans, angle grinders, driveshafts, and compressors vibrate when they are operating. The vibration can be captured by a transducer (displacement, velocity, or acceleration). In order to understand vibration, we can start with a simplified problem. Let’s take an example of a fan that rotates on it’s axis. If we attach a weight on one of its blades and put a transducer on the bearing, we should see a waveform shown in the Figure below. Read More