This paper describes how transient vibration data can be used to provide much more information about a piece of machinery than steady state data alone. Most of the machinery described is of the high-speed nature with hydrodynamic journal bearings and non contacting eddy current displacement probes, though many of the principles apply to low-speed applications with anti-friction bearings. A brief description is given of the type of diagnostic equipment required to gather transient data. The different types of transient data plots are described along with the different insights they each provide. Likewise, several case studies are presented where transient data were used to evaluate the stability of the machinery as well as determine the source of the excitation forces. Another important benefit of transient data is that it provides a method of verifying machinery natural mode frequencies and rotordynamic models.
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