Modeling of residual service life of gas turbine rotors for minimizing replacement costs

Eusebia Zouridaki, Vasilios Spitas, Christos Spitas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

One of the most catastrophic failures observed in gas turbine powered electrical powerplants is the fracture of the turbine rotor. A simplified model consisting of 3 macro-elements is suggested to model the dynamical behavior of the shaft with a propagating torsional crack. A modal analysis is carried out in order to calculate the response spectrum of the rotor and the relevant natural frequencies of the dynamical system. The residual service life of the rotor shaft is estimated from existing dα / dΝ-ΔκIII graphs for the rotor material. When the calculated residual service life approaches the ordering-delivery time for the rotor components plus a safety margin, then the order is placed and thus the idling time for fracture to replacement (if fracture happens prematurely) or the waiting time until actual fracture occurs is minimized. In this way the financial benefit from the proposed just-in-time scenario is maximized. A case study corresponding to the 3, 50MW industrial gas-turbine rotor of the Public Power Station in Chania, Greece is also presented.

Original languageEnglish
Title of host publicationProceedings of the 26th IASTED International Conference on Modelling, Identification, and Control, MIC 2007
Pages253-258
Number of pages6
Publication statusPublished - Dec 1 2007
Event26th IASTED International Conference on Modelling, Identification, and Control, MIC 2007 - Innsbruck, Austria
Duration: Feb 12 2007Feb 14 2007

Publication series

NameProceedings of the IASTED International Conference on Modelling, Identification, and Control, MIC
ISSN (Print)1025-8973

Other

Other26th IASTED International Conference on Modelling, Identification, and Control, MIC 2007
CountryAustria
CityInnsbruck
Period2/12/072/14/07

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Keywords

  • Crack propagation
  • Gas-turbine
  • Modeling
  • Power-plant
  • Replacement costs

ASJC Scopus subject areas

  • Software
  • Modelling and Simulation
  • Computer Science Applications

Cite this

Zouridaki, E., Spitas, V., & Spitas, C. (2007). Modeling of residual service life of gas turbine rotors for minimizing replacement costs. In Proceedings of the 26th IASTED International Conference on Modelling, Identification, and Control, MIC 2007 (pp. 253-258). (Proceedings of the IASTED International Conference on Modelling, Identification, and Control, MIC).