Experiences
with Nonsynchronous Forced Vibration in Centrifugal Compressors
D. R. Smith/J. C. Wachel, Rotordynamic Instability
Problems in High Performance Turbomachinery -- 1984, Texas
A&M University, May 1984 .
When a compressor
rotor experiences subsynchronous vibration, the problem is generally
considered to be a shaft instability problem associated with the
stability of the rotor on the bearing oil film. However, many times
the high subsynchronous vibrations are forced vibrations caused
by flow instabilities, such as stage stall. In these cases, modifications
to improve the rotor stability by changing the bearings or seals
will have little effect on the subsynchronous vibrations. It is
therefore important to understand the differences between forced
vibrations and self-excited vibrations so the problem can be properly
diagnosed and corrected (References 1-4). The following is a list
of characteristics of the two types of subsynchronous vibration.
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