Abstract
Comparisons are made betwen amplitude versus frequency and amplitude versus time analyses for typical machinery generated vibrations such as unbalance, misalignment, oil whirl, and aerodynamic/hydraulic pulsations. The information provided in each case shows the extent to which the amplitude versus time supplements the amplitude versus frequency analysis. Transient and non-steady-state vibrations are shown to be particularly well suited to amplitude versus time analysis; providing considerably more information than amplitude versus frequency. In particular, examples include machine criticals, beat frequencies, and electrical unbalance. Various combinations of basic vibration waveforms are used to suggest standardized techniques which can aid in simplifying interpretation of actual vibration data. The use of phase measurements, as obtained from time wave forms and as a direct measurement, is described for balancing and detection of machine defects.
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