What are the vibration characteristics of mechanical looseness?
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The time period waveform is erratic and pattern is non repetitive.
Frequency spectrum displays multiple harmonics 1 to 10
RPM, sub harmonics 0.5
RPM and half harmonic 1.5, 2.5, 3.5 
RPM.
Some driving force is required for looseness. Mechanical looseness get aggravated in presence of driving force like unbalance…etc.