Forcing Frequencies
In a rotating machine, the moving parts impart vibratory forces into the structure, and these forces occur at specific frequencies determined by the dynamics of the moving element. The resulting vibration of the machine will occur at these frequencies and other frequencies that are related to them. The most important forcing frequencies of interest to the maintenance engineer and vibration analyst are the ones related to various faults such as bearing problem, misalignment, mechanical looseness, etc. These frequencies should be identified and kept at hand by the analyst when examining vibration spectra. One of the most important uses of the VTAG is the listing of the forcing functions present in each machine.
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