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Transient Vibration Analysis
| Vibration of machinery may change over time, with load, speed, temperature, etc. Transient (versus speed) and trend (versus time) analysis of vibration during these changes can identify many problems that data collected during stable operation cannot. Although a single channel analyzer with tachometer input can be used, the most common analysis requires multi-channel instruments to capture data typically from accelerometers or proximity probes that are located at the bearings of a machine. A once per revolution signal from each shaft is used to trigger the analyzer sampling so that phase information is obtained. The analyzer may be triggered to capture at certain time intervals, continuously record, on RPM change, vibration amplitude level, load change, etc. |
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The typical transient data plot formats include Bode’, Polar, Shaft Centerline, Waterfall, and Orbit. The plots may be displayed in near real time with newer systems, or post processed and analyzed at a later time. Trend data may display amplitude, phase, DC gap voltage, shaft centerline, position, RPM, etc. We use IOtech 618 systems with Tomas Software.
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