In the dynamics of turbomachinery the mechanical damping of the blading is in the focus of research for the last decades to improve the dynamic performance in terms of high cycle fatigue issues. Besides that 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 which 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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ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition
June 6–10, 2011
Vancouver, British Columbia, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5466-2
PROCEEDINGS PAPER
Eddy Current Damper for Turbine Blading: Electromagnetic Finite Element Analysis and Measurement Results
Jacob Laborenz,
Jacob Laborenz
Leibniz Universita¨t Hannover, Hannover, Germany
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Malte Krack,
Malte Krack
Leibniz Universita¨t Hannover, Hannover, Germany
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Lars Panning,
Lars Panning
Leibniz Universita¨t Hannover, Hannover, Germany
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Jo¨rg Wallaschek,
Jo¨rg Wallaschek
Leibniz Universita¨t Hannover, Hannover, Germany
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Pierre-Alain Masserey
Pierre-Alain Masserey
Alstom Power, Baden, Switzerland
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Jacob Laborenz
Leibniz Universita¨t Hannover, Hannover, Germany
Malte Krack
Leibniz Universita¨t Hannover, Hannover, Germany
Lars Panning
Leibniz Universita¨t Hannover, Hannover, Germany
Jo¨rg Wallaschek
Leibniz Universita¨t Hannover, Hannover, Germany
Markus Denk
Alstom Power, Baden, Switzerland
Pierre-Alain Masserey
Alstom Power, Baden, Switzerland
Paper No:
GT2011-45242, pp. 847-858; 12 pages
Published Online:
May 3, 2012
Citation
Laborenz, J, Krack, M, Panning, L, Wallaschek, J, Denk, M, & Masserey, P. "Eddy Current Damper for Turbine Blading: Electromagnetic Finite Element Analysis and Measurement Results." Proceedings of the ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. Volume 6: Structures and Dynamics, Parts A and B. Vancouver, British Columbia, Canada. June 6–10, 2011. pp. 847-858. ASME. https://doi.org/10.1115/GT2011-45242
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