Torsional Systems: Vibration Response by Means of Modal Analysis

  • P. Schwibinger
  • R. Nordmann
Part of the International Centre for Mechanical Sciences book series (CISM, volume 297)


Large steam-turbine generators in operation may be stimulated to torsional vibrations by dynamic moments at the generator due to electrical system transients. To solve the torsional vibration problem the turbogenerator shaft is modelled by the finite element method. The equations of motion are solved for the transient vibrations with the modal analysis technique — ‘Time-History-Method’. If the designer is interested in an approximation for the maximum response the ’Response-Spectrum-Method’ proves to work very effectively. This paper discusses ‘Time-History-’ and ’Response-SpectrumMethod’ and presents the results for a 600 MW and a 722 MW turbo set.


Response Spectrum Excitation Function Torsional Vibration Modal Force Participation Factor 
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Copyright information

© Springer-Verlag Wien 1988

Authors and Affiliations

  • P. Schwibinger
    • 1
  • R. Nordmann
    • 1
  1. 1.University of KaiserslauternKaiserslauternGermany

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