In the dynamics of turbomachinery, the mechanical damping of the blading has been the focus of research for the last decades to improve the dynamic performance in terms of high cycle fatigue issues. In addition, an increased mechanical damping can produce a higher flutter safety margin such that stable operation conditions are achievable in a bigger range. Hence, novel damping techniques are considered besides the well known friction based damping devices. In this paper, an extended analysis of the eddy current based damping device for a last stage steam turbine blading presented in GT2009-59593 is conducted. A transient electromagnetic finite element analysis of the eddy current damper is performed, and the resulting damping forces are compared to their analytical solution. Parameter studies are carried out, and equivalent damping factors are calculated. Furthermore, for the validation of the finite element model, a test rig was built that allows for the direct measurement of damping forces when forcing a sinusoidal relative motion. Forced response measurements and simulations are used to demonstrate its dynamic performance and predictability.
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e-mail: laborenz@ids.uni-hannover.de
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April 2012
Research Papers
Eddy Current Damper for Turbine Blading: Electromagnetic Finite Element Analysis and Measurement Results
Jacob Laborenz,
Jacob Laborenz
Institute of Dynamics and Vibration Research,
e-mail: laborenz@ids.uni-hannover.de
Leibniz Universität Hannover
, 30167 Hannover, Germany
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Malte Krack,
Malte Krack
Institute of Dynamics and Vibration Research,
Leibniz Universität Hannover
, 30167 Hannover, Germany
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Lars Panning,
Lars Panning
Institute of Dynamics and Vibration Research,
Leibniz Universität Hannover
, 30167 Hannover, Germany
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Jörg Wallaschek,
Jörg Wallaschek
Institute of Dynamics and Vibration Research,
Leibniz Universität Hannover
, 30167 Hannover, Germany
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Markus Denk,
Markus Denk
ALSTOM Power, Steam Turbines and Generators, 5401 Baden,
Switzerland
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Pierre-Alain Masserey
Pierre-Alain Masserey
ALSTOM Power, Steam Turbines and Generators, 5401 Baden,
Switzerland
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Jacob Laborenz
Institute of Dynamics and Vibration Research,
Leibniz Universität Hannover
, 30167 Hannover, Germany
e-mail: laborenz@ids.uni-hannover.de
Malte Krack
Institute of Dynamics and Vibration Research,
Leibniz Universität Hannover
, 30167 Hannover, Germany
Lars Panning
Institute of Dynamics and Vibration Research,
Leibniz Universität Hannover
, 30167 Hannover, Germany
Jörg Wallaschek
Institute of Dynamics and Vibration Research,
Leibniz Universität Hannover
, 30167 Hannover, Germany
Markus Denk
ALSTOM Power, Steam Turbines and Generators, 5401 Baden,
Switzerland
Pierre-Alain Masserey
ALSTOM Power, Steam Turbines and Generators, 5401 Baden,
Switzerland
J. Eng. Gas Turbines Power. Apr 2012, 134(4): 042504 (8 pages)
Published Online: February 1, 2012
Article history
Received:
June 21, 2011
Accepted:
June 21, 2011
Online:
February 1, 2012
Published:
February 1, 2012
Citation
Laborenz, J., Krack, M., Panning, L., Wallaschek, J., Denk, M., and Masserey, P. (February 1, 2012). "Eddy Current Damper for Turbine Blading: Electromagnetic Finite Element Analysis and Measurement Results." ASME. J. Eng. Gas Turbines Power. April 2012; 134(4): 042504. https://doi.org/10.1115/1.4004734
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