Abstract

Part I?Theoretical Model for a Synchronous Thermal Instability Operating in Overhung Rotors

Highlights

  • A theoretical model has been developed for a synchronous thermal instability that is caused by differential viscous shearing in bearings of overhung rotors

  • Within the last decade much interest has been shown in the area of thermal bending in overhung rotors

  • This article develops a simple model of rotor thermal bending without using complex analysis

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Summary

INTRODUCTION

Within the last decade much interest has been shown in the area of thermal bending in overhung rotors. An initial deformed rotor configuration is assumed and used as an input in a dynamic model of the rotor system This dynamic model produces a synchronous orbit which causes a circumferential temperature distribution to develop on portions of the shaft within the bearings. The initial mechanical and thermal bends, which are used in the models by other researchers, produce unbalances that affect the response of the rotor system and determine the size of the synchronous orbit. This unbalance is put into the dynamic rotor model to obtain the synchronous orbit.

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CONCLUSIONS
Findings
Tamb U
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