In Part I of this work, a theoretical analysis showed that the surrounding air in the closed confinement between rotor and casing has a significant effect on the dynamic behavior of high speed minirotors. In order to validate the developed theoretical model, an experimental setup is designed and the dynamic behavior of the rotor with medium gap confinement is studied. The experimental setup has flexible supports, which consist of beams with adjustable length. The support stiffness is changed by altering the beam length. Modal analysis of the rotor is done in free-free conditions in order to test the capability of the rotordynamic model without the supports and multiphysical effects. The experimental and simulation results agree well with a difference of 1%. Then modal analysis of the whole structure is done at standstill and during operation in the absence of the casing. In this way, multiphysical effects are eliminated and only support effects on the dynamics of the structure are observed. The supports appear to have significant effect on the natural frequencies of the flexural modes of the system. Different support modeling techniques are studied and adequate equivalent models are obtained. These models are then implemented into the structural model of the rotor. Finally, multiphysical effects are tested at different speeds with different support stiffnesses. Experiments are performed with and without the casing for determining the change in the natural frequencies and onset of instability. The surrounding fluid has a significant effect on the stability of the system while the natural frequencies do not change significantly. The experimental and theoretical results are in fair agreement for predicting the natural frequencies and the onset of instability.
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June 2010
Research Papers
Influence of Multiphysical Effects on the Dynamics of the High Speed Mini Rotors—Part II: Results
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): 031011 (7 pages)
Published Online: May 4, 2010
Article history
Received:
May 4, 2009
Revised:
November 26, 2009
Online:
May 4, 2010
Published:
May 4, 2010
Connected Content
A companion article has been published:
Influence of Multiphysical Effects on the Dynamics of High Speed Minirotors—Part I: Theory
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 the High Speed Mini Rotors—Part II: Results." ASME. J. Vib. Acoust. June 2010; 132(3): 031011. https://doi.org/10.1115/1.4000788
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