The traditional 8-coefficient bearing model, used in linear rotor dynamics, is shown here to be inadequate for the unbalance response calculation of rotor systems supported on hydrodynamic journal bearings placed close to nodal points of excited modes of vibration. In such situations, one cannot neglect the time varying tilt angle between journals and bearings, whose consideration leads to the adoption of a 32-coefficient bearing model. Numerical results indicate that the differences between vibration amplitudes calculated using both bearing models can be greater than 100%, while discrepancies in the predicted stability thresholds are small. The conclusions of the study are coherent with previously published theoretical and experimental results.
Skip Nav Destination
e-mail: dczachar@usp.br
Article navigation
July 2006
Technical Papers
Unbalance Response of Rotors Supported on Hydrodynamic Bearings Placed Close to Nodal Points of Excited Vibration Modes
Demetrio C. Zachariadis
Demetrio C. Zachariadis
Department of Mechanical Engineering, Polytechnic School,
e-mail: dczachar@usp.br
University of São Paulo
, Av. Prof. Mello Moraes 2231, São Paulo 05508-900, Brazil
Search for other works by this author on:
Demetrio C. Zachariadis
Department of Mechanical Engineering, Polytechnic School,
University of São Paulo
, Av. Prof. Mello Moraes 2231, São Paulo 05508-900, Brazile-mail: dczachar@usp.br
J. Eng. Gas Turbines Power. Jul 2006, 128(3): 661-669 (9 pages)
Published Online: March 1, 2002
Article history
Received:
December 1, 2001
Revised:
March 1, 2002
Citation
Zachariadis, D. C. (March 1, 2002). "Unbalance Response of Rotors Supported on Hydrodynamic Bearings Placed Close to Nodal Points of Excited Vibration Modes." ASME. J. Eng. Gas Turbines Power. July 2006; 128(3): 661–669. https://doi.org/10.1115/1.2132381
Download citation file:
Get Email Alerts
Cited By
On Leakage Flows In A Liquid Hydrogen Multi-Stage Pump for Aircraft Engine Applications
J. Eng. Gas Turbines Power
A Computational Study of Temperature Driven Low Engine Order Forced Response In High Pressure Turbines
J. Eng. Gas Turbines Power
The Role of the Working Fluid and Non-Ideal Thermodynamic Effects on Performance of Gas Lubricated Bearings
J. Eng. Gas Turbines Power
Tool wear prediction in broaching based on tool geometry
J. Eng. Gas Turbines Power
Related Articles
Mode Evolution of Cyclic Symmetric Rotors Assembled to Flexible Bearings and Housing
J. Vib. Acoust (October,2009)
Influence of Inlet Oil Temperature on the Instability Threshold of Rotor-Bearing Systems
J. Tribol (April,2006)
Related Proceedings Papers
Related Chapters
Unbalance
Fundamentals of Rotating Machinery Diagnostics
Research Tools
Bearing Dynamic Coefficients in Rotordynamics: Computation Methods and Practical Applications
Summary and Conclusions
Bearing Dynamic Coefficients in Rotordynamics: Computation Methods and Practical Applications