In this study, a modeling approach has been developed to take multiphysical effects into account in the prediction of the rotordynamic behavior of high speed minirotating machinery with a moderate flow confinement. The temperature increase in the confinement and the flow induced forces resulting from the surrounding fluid have been studied and these models are combined with the structural finite element models for determining the rotordynamic behavior. The structure has been analyzed via finite elements based on Timoshenko beam theory. Flow induced forces are implemented to the structure as added mass-stiffness-damping at each node representing the structure in the fluid confinement. A thermal model based on thermal networks in steady-state has been developed. This model is used to calculate the heat dissipation resulting from air friction and temperature increase in the air gap as a function of rotation speed. At each rotation speed, the temperature in the air gap between the rotor and stationary casing is calculated and air properties, which are used for the calculation of flow induced forces are updated. In this way, thermal and fluid effects in medium gap confinements are coupled with the rotordynamic model and their effects on stability, critical speeds, and vibration response are investigated. The experimental results are reported and compared with the theoretical results in an accompanying paper (Part II).
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June 2010
Research Papers
Influence of Multiphysical Effects on the Dynamics of High Speed Minirotors—Part I: Theory
Emre Dikmen,
Emre Dikmen
Department of Applied Mechanics, Faculty of Engineering Technology,
e-mail: e.dikmen@utwente.nl
University of Twente
, P.O. Box 217, 7500 AE Enschede, The Netherlands
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Peter J. M. van der Hoogt,
Peter J. M. van der Hoogt
Department of Applied Mechanics, Faculty of Engineering Technology,
University of Twente
, P.O. Box 217, 7500 AE Enschede, The Netherlands
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André de Boer,
André de Boer
Department of Applied Mechanics, Faculty of Engineering Technology,
University of Twente
, P.O. Box 217, 7500 AE Enschede, The Netherlands
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Ronald G. K. M. Aarts
Ronald G. K. M. Aarts
Department of Mechanical Automation, Faculty of Engineering Technology,
University of Twente
, P.O. Box 217, 7500 AE Enschede, The Netherlands
Search for other works by this author on:
Emre Dikmen
Department of Applied Mechanics, Faculty of Engineering Technology,
University of Twente
, P.O. Box 217, 7500 AE Enschede, The Netherlandse-mail: e.dikmen@utwente.nl
Peter J. M. van der Hoogt
Department of Applied Mechanics, Faculty of Engineering Technology,
University of Twente
, P.O. Box 217, 7500 AE Enschede, The Netherlands
André de Boer
Department of Applied Mechanics, Faculty of Engineering Technology,
University of Twente
, P.O. Box 217, 7500 AE Enschede, The Netherlands
Ronald G. K. M. Aarts
Department of Mechanical Automation, Faculty of Engineering Technology,
University of Twente
, P.O. Box 217, 7500 AE Enschede, The NetherlandsJ. Vib. Acoust. Jun 2010, 132(3): 031010 (9 pages)
Published Online: May 4, 2010
Article history
Received:
May 4, 2009
Revised:
November 26, 2009
Online:
May 4, 2010
Published:
May 4, 2010
Citation
Dikmen, E., van der Hoogt, P. J. M., de Boer, A., and Aarts, R. G. K. M. (May 4, 2010). "Influence of Multiphysical Effects on the Dynamics of High Speed Minirotors—Part I: Theory." ASME. J. Vib. Acoust. June 2010; 132(3): 031010. https://doi.org/10.1115/1.4000787
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