everything that rotates
                        needs to be balanced


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Vibration Information for rotating machinery applications.


Spectral Vs. Waveform Data

Friday, January 13, 2012

Spectral data is displayed in the frequency domain while waveform data is in the time domain. Spectral information is obtained by applying a Fourier transform to waveform data; this converts the data to show that amplitude and phase of the vibration at different frequencies. Read More

New Machinery: Acceptance Testing

Monday, December 05, 2011

The most important step before purchasing a new machine is to establish acceptance testing. Acceptance testing can be used to ensure the new machine is free from faults and runs smoothly before placing it in service. The purchase order can specify where and how vibration measurements are taken on the machine and type of vibration data (displacement, velocity, or acceleration) are to be collected. It can also specify the procedures for measuring vibrations after startup at the plant. The sign-off does not have to be made immediately after receiving the machine. The machine has to be checked and ensured it is working properly under normal loads and within vibration limits. Read More

Measurement and Data Acquisition Equipment

Monday, November 14, 2011

Numerous companies specialize in supplying measurement and data acquisition systems. Equipment is available at various price points and with different capabilities. Selecting the appropriate equipment can save you time and money if done correctly.  Read More

Gearboxes: Gear Mesh Frequency

Monday, July 11, 2011

Gear mesh frequency, which is also called tooth mesh frequency, is the frequency at which gear teeth mate together in a gearbox. There are three important frequencies involved in gearboxes: input speed, gear mesh frequency, and output speed. Gearboxes will always have a strong vibration component at the gear mesh frequency. 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