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Rub and Looseness

Excerpt

Rub and looseness are two different phenomena that, because of their similar rotor dynamic behavior, produce remarkably similar symptoms. Both malfunctions are capable of producing changes in 1X vibration, as well as generating super- and subsynchronous vibration. The two phenomena are, in some respects, mirror images of each other. For that reason, we will discuss both types of malfunctions in this chapter.

Rub and Looseness
Partial Radial Rub
Full Annular Rub
Rub-Induced Forces and Spring Stiffness Changes
Rub and Steady State 1X Vibration
Rub and 1X Vibration During Resonance
Subsynchronous Vibration
Symptoms of Rub
Other Malfunctions with Similar Symptoms
Summary

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