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VIBRATION AND INSTABILITY ANALYSIS OF ROTOR-BEARING SYSTEM
Project:
Vibration and Instability Analysis of Rotor-Bearing System
Sponsor: Louisiana
Board of Regents and GSCC
Award No: LEQSF(2000-03)-RD-B-02
University: LSU, Mechanical Engineering
Principal Investigator: Dr. Michael Khonsari
Graduate Students: Jianke Wang, Sumit Singhal, and Darryl Chauvin Jr
Contact Information: Dr. Michael Khonsari, Jianke Wang
Project Description:
With the increasing
speed of rotating machinery, the subsynchronous vibration of rotor dynamic
systems is becoming more and more serious. Generally speaking, the subsynchronous
vibration consists of two kinds of phenomena: oil whirl and oil whip.
To improve the performance and reliability of the rotor-bearing systems
supported by oil-film bearings and to avoid the catastrophic rotor-bearing
system failure caused by the subsynchronous vibration, it is imperative
to predict the whirl threshold speed accurately. The possibility of
the occurrence of the subsynchronous vibration must be taken into account
at the very first design stage.
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To perform
an extensive experimental research on the vibration and instability
analysis of Rotor-Bearing System, a test rig has been designed,
built, and tested. This rig is equipped with vibration and temperature
transducers are capable of running at top speed of 10,000 rpm.
The software Benly's "ADRE" is used for data acquisition
and analysis.
The focus
of this project is to study the effects of the inlet oil temperature
on the threshold speed of oil whirl of the rotor-bearing system
supported by identical oil-film journal bearings. Disparities
in assessing the effect of inlet temperature on the threshold
speed in hydrodynamic bearings have been documented in the literature
for a long time. Specifically, some classical papers presented
evidence that lowering the inlet temperature tends to have a stabilizing
effect, while others have shown the opposite. No clear explanation
has been offered for this phenomenon. In this project, both experiments
and theoretical simulations will be performed to explain the difference
of these predecessors' conclusions and try to get a unified conclusion
for all of these controversies.
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