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Updating of the Torsional Model of a Steam Turbo Generator

[+] Author Affiliations
Roberto Ricci, Paolo Pennacchi

Politecnico di Milano, Milan, Italy

Emanuel Pesatori, Giorgio Turozzi

Franco Tosi Meccanica S.p.A., Legnano (MI), Italy

Paper No. DETC2009-86553, pp. 1043-1052; 10 pages
  • ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 22nd Biennial Conference on Mechanical Vibration and Noise, Parts A and B
  • San Diego, California, USA, August 30–September 2, 2009
  • Conference Sponsors: Design Engineering Division and Computers in Engineering Division
  • ISBN: 978-0-7918-4898-2 | eISBN: 978-0-7918-3856-3
  • Copyright © 2009 by ASME


Rotor modeling by means of finite elements is necessary for rotordynamic calculations of industrial machines. Standard methods are available and allow forecasting rather accurately the experimental dynamic behavior of the considered machines. Anyhow, in some cases, due to the specific layout of the machine, the model made by means of these methods has to be updated to fit experimental results. In this paper, the updating of the torsional model of a steam turbogenerator is presented. Starting from some differences between the eigenfrequencies calculated using the standard model and the natural frequencies measured on-field, a modeling improvement is proposed, considering partially the dynamics of the parts usually modeled as rigid disks, with the aim to preserve the physical meaning of the model. The new model is updated and a very good fitting is obtained between eigenfrequencies and natural frequencies.

Copyright © 2009 by ASME



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