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High vibrations in no-break MG set

High vibrations in no-break MG set

High vibrations in no-break MG set

This is a 1500 RPM, 50 Hz no-break MG set with an diesel engine, flywheel with clutch, an ac motor and a dc generator. The whole train is mounted on AVM pads on a common concrete base as shown below.

With the engine disengaged and only the ac motor driving the flywheel and the DC generator, the vibrations are consistently high in the region of 5 to 10 mm/sec rms. I have enclosed the overall vibration levels (over a 3-week period) and the spectrum for each bearing of the flywheel, the ac motor and the dc generator.

I look forward to your opinions for the causes of such high vibrations, especially the 3X to 5X vibrations of the flywheel, and when the diesel engine is not running.


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