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On Blade Damping Technology Using Passive Piezoelectric Dampers

[+] Author Affiliations
Sebastian M. Schwarzendahl, Marcus Neubauer, Lars Panning, Jörg Wallaschek

Leibniz Universität Hannover, Hannover, Germany

Jaroslaw Szwedowicz

Alstom Power, Baden, Switzerland

Paper No. GT2012-68600, pp. 1205-1215; 11 pages
doi:10.1115/GT2012-68600
From:
  • ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
  • Volume 7: Structures and Dynamics, Parts A and B
  • Copenhagen, Denmark, June 11–15, 2012
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4473-1
  • Copyright © 2012 by ASME and Alstom Technologies Ltd.

abstract

This paper deals with a new damping concept for turbine blade vibrations utilizing piezoelectric material. A passive piezo damper consists of a piezoelectric element and a passive electric network connected to its electrodes. The damping performance depends on the size and location of the piezoelectric element with respect to the mode shape of the mechanical strain. Numerical and experimental investigations are carried out on a rigidly clamped simplified compressor blade at stand still and ambient conditions. An optimization process incorporating electromechanical finite element calculations determines the optimal position of the piezo damper in regard to the mode shape of interest. By applying the computed and measured Frequency Response Functions, the damping performance with and without piezo-damper are compared and referred to the measured material damping. The obtained numerical results are in very good agreement with the measured data, leading to a promising damping performance in real application.

Copyright © 2012 by ASME and Alstom Technologies Ltd.
Topics: Dampers , Damping , Blades

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