Online Fatigue Monitoring System for Steam Turbine Rotor in Power Plants Considering Sub-Synchronous Oscillation


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This paper presents a system developed for online fatigue monitoring for steam turbine rotor in power plants. The system converts the plant transients to temperature and thermal stress responses using the analytical models modified by FEM. The torsional vibration caused by the possible sub-synchronous oscillation (SSO) phenomenon in power networks has been analyzed. The fatigue damage caused by thermal stress and SSO is studied based on the stress analysis and fatigue cumulation. The fatigue usage factor is computed using the rainflow cycle counting algorithm. The method can provide useful information in support of the unit’s life cycle management and efficient.



Edited by:

Mohamed Othman




S. Liu et al., "Online Fatigue Monitoring System for Steam Turbine Rotor in Power Plants Considering Sub-Synchronous Oscillation", Applied Mechanics and Materials, Vols. 229-231, pp. 1162-1165, 2012

Online since:

November 2012




[1] N.K. Mukhopadhyay *, B.K. Dutta, H.S. Kushwaha. On-line fatigue–creep monitoring system for high-temperature components of power plants,. International Journal of Fatigue , 23(2001) , 549–560.


[2] S. Zucca, D. Botto, M.M. Gola. Faster on-line calculation of thermal stresses by time integration,. International Journal of Pressure Vessels and Piping 81(2004), 393–399.


[3] Mukhopadhyay NK, Dutta BK, Kushwaha HS, Mahajan SC, Kakodkar A. On line fatigue life monitoring methodology for power plant components,. Int J Press Ves Piping 60(1994), 297–306.


[4] Chen KL, Kuo AY. Green's function technique for structures subjected to multiple site thermal loading,. Struct Mech Reactor Technol 11(1989), 353–8.

[5] Sakai K, Hojo K, Kato A, Umehara R. On-line fatigue-monitoring system for nuclear power plant,. Nucl Eng Des vol. 153(1994), 19–25.


[6] Botto D, Zucca S, Gola MM. A methodology for on-line calculation of temperature and thermal stress under non-linear boundary conditions,. Int J Press Vessels Piping vol. 80(2003), 21–9.


[7] H.L. Zhang, The Research and Development of High-Quality Thermal-Stress Online Monitoring Model for 600MW Turbine Rotors,. Proceedings of the CSEE, (2006, 1).

[8] Xiao JF, analysis of the steam turbine blade coupling vibration characteristics of impeller with 3 d finite element modal synthesis method (MS, Xian thermal research institute(1999).