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</html><description>A&nbsp;vibration&nbsp;often present in the&nbsp;reciprocating&nbsp;machinery,&nbsp;and also the rotary machinery,&nbsp;has its origins in&nbsp;small oscillations of&nbsp;angular&nbsp;velocity.&nbsp;The torsional movement appears superimposed on the continuous rotational movement of the rotating parts and it is the periodic oscillations around the rotational speed which are the origin of the torsional vibration. Torsional vibrations can cause serious damage to equipment.&nbsp;Unfortunately, torsional vibration is...</description></oembed>
