everything that rotates
                        needs to be balanced

 

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Vibration Information for rotating machinery applications.

 

Vibration Analysis: Identifying Operating Speed

Friday, July 08, 2011

One of the first steps in vibration analysis is identifying the operating or running speed of a machine. Knowing this value is important because details about the state of the machine are usually linked to this particular frequency, as explained in a previous posting. Read More

Sidebands

Monday, July 04, 2011

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Static Balancing

Friday, July 01, 2011

Static balancing was the primary method for balancing before more sophisticated machines became available that could dynamically measure imbalance in rotating parts. Static balancing can be accomplished by placing a part on knife edges; the part will usually rotate until the heaviest side rests at the bottom. Material can either be removed from the heavy side, or added to the opposite side to try and correct the imbalance. This process is repeated until the part can rest at any angle without turning. Read More

Beat Frequency

Monday, June 27, 2011

Have you ever walked in a plant and heard a sound from pumps or motors to be alternatively soft and loud? If you have, you experienced a phenomenon, which is called “beating”. The same phenomenon occurs in vibration. If two or more machines run close to each other, beating frequency is produced. Read More

Vibration Analysis: Averaging

Friday, June 24, 2011

Ideally a vibration signal will be free of any noise or interference that would hinder analysis. Unfortunately, this is never the case in the real world; there are always constant and uncontrollable changes to the vibration in a machine that add noise to the signal. Figure 1, below, shows a noise-free vibration signal that can be produced by a rotating machine with a mass imbalance. Figure 2 shows the same signal, but this time it has noise and is a more accurate representation of the data that would be collected. Read More