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.

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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