Nonlinear Approarch to Model-Based Diagnostics of a Rotor Supported on Hydrodynamic Bearings

• Autorzy: Czop P.
• Języki publikacji: EN

Abstrakty

EN

This paper presents numerical analyzes of a hydrodynamically supported rotor for purpose of fault detection with use of a parametric model-based approach. The significant increase of bearing load is considered as a faulty condition. The nonlinear and time varying diagnostic model is identified with use of Levenberg-Marquardt method. The transfer function model is instantaneously extracted from the considering nonlinear diagnostic model. The extraction is conducted based on the instantaneous linearization method for each discrete time interval. In the next step parameters are transformed into functions of natural frequencies and damping ratios vs. time. This method allows tracking changes of model parameters providing more sensitive detection of feasible malfunctions. The simulation of rotor-support model was conducted to generate numerical data for the experiment.

Słowa kluczowe

EN

system identification; rotating machinery; model linearization

• Wydawca: Oficyna Wydawnicza Politechniki Warszawskiej
• Czasopismo: Machine Dynamics Problems
• Rocznik: 2005
• Tom: Vol. 29, No. 2
• Strony: 23--34
• Opis fizyczny: Bibliogr. 11 poz., wykr.

Twórcy

autor

Czop P.

• Tenneco Automotive - Eastern European Engineering Center - EEEC, Gliwice,

Bibliografia

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• 6. Ljung, L., 1999, System Identification - Theory for the User, Prentice-Hall.
• 7. Mahrenholtz, O. (ed.), 1984, Dynamics of Rotors, Stability and System Identification, Springer-Verlag.
• 8. Muszyńska, A., 1995, Vibrational Diagnostics of Rotating Machinery Malfunctions. The Course on Rotor Dynamics and Vibration in Turbomachinery, von Karman Institute for Fluid Dynamics, Belgium, 21-25 September 1992, International Journal of Rotating Machinery, 1, No 3-4, 237-266.
• 9. Norgaard, M., Ravn, O., Poulsen, N.K., Hansen, L.K., 2000, Neural network for modelling and control of dynamic systems, Springer-Verlag, London.
• 10. Przybyłowicz, P.M., 2002, Active stabilization of a rigid rotor by a piezoelectrically controlled mobile journal bearing system, Sixth International Conference on Rotor Dynamics Proceedings, Sydney, Australia, 79-84.
• 11. Xia, S., Wang, L., Huang, W., Hu, C., Jiao, Y., 2002, A method for analyzing the dynamic behavior of rotor-bearing systems with nonlinear supports, Sixth International Conference on Rotor Dynamics Proceedings, Sydney, Australia, 471-478.