lblin. - Engineering Dynamics
to lower the critical speed away from operating speed, the lube oil was warmed up to 120oF. The effect of the bearing oil temperature reduced the critical speed to 3450 rpm with an am- plitude of 7.7 mils and an amplifi.cation factor of 21.5 (Figure 7).This sensitivity to bearing oil film stiffness indicated that the critical speed could also be affected by a change in the bearing
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