In gas and steam turbine applications a common approach to prevent the blades from high cycle fatigue failures due to high vibration amplitudes is the usage of friction damping elements. Besides the intended amplitude reduction this procedure also features some possibly unwanted side effects like a shift in resonance frequencies due to stiffening effects caused by the contact. Thus, as an alternative an eddy current based noncontacting damping concept for the application in turbomachinery is investigated. In this paper two different types of eddy current dampers are considered. Theoretical models for both are established by applying electromagnetic-mechanical theory. The theoretical models are compared with forced response measurements that are performed at a stationary test rig.
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Eddy Current Damping: A Concept Study for Steam Turbine Blading
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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Christian Siewert,
Christian Siewert
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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Christoph Gerber,
Christoph Gerber
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, Germanye-mail: laborenz@ids.uni-hannover.de
Christian Siewert
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
Christoph Gerber
ALSTOM Power, Steam Turbines and Generators
, 5401 Baden, Switzerland
Pierre-Alain Masserey
ALSTOM Power, Steam Turbines and Generators
, 5401 Baden, SwitzerlandJ. Eng. Gas Turbines Power. May 2010, 132(5): 052505 (7 pages)
Published Online: March 5, 2010
Article history
Received:
April 8, 2009
Revised:
April 15, 2009
Online:
March 5, 2010
Published:
March 5, 2010
Citation
Laborenz, J., Siewert, C., Panning, L., Wallaschek, J., Gerber, C., and Masserey, P. (March 5, 2010). "Eddy Current Damping: A Concept Study for Steam Turbine Blading." ASME. J. Eng. Gas Turbines Power. May 2010; 132(5): 052505. https://doi.org/10.1115/1.3205032
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