Dynamic Characteristic Analysis of a Rotor System with Rub-impact Fault Considering Rotor-stator Misalignment

• Autorzy: Ma H. , Tai X. , Zhang Z. , Wen B.

Warianty tytułu

PL

Analiza właściwości dynamicznych systemu z wirnikiem przy uwzględnieniu niewspółosiowości wirnika i stojana

• Języki publikacji: EN

Abstrakty

EN

In this paper, taking a single span flexible rotor system with two discs as the research object, the finite element model of the rotor-bearing system is established. The stator is simplified as a group of equispaced points along the circumference and the rotor as a point based on the contact dynamic theory. The rotor-stator rubbing is simulated using multiple point-point contact elements, the separation and the contact of the rotor and stator are determined by the change of the cylindrical gap, and the rotor and stator model are coupled by nonlinear contact force. By adopting the augmented Lagrangian method to deal with contact constraint conditions, Coulomb friction model to simulate rotor-stator frictional characteristics, the responses of the rotor system with rubbing are analyzed. The effects of rotating speeds and rubbing stiffness on normal rubbing forces are discussed under asymmetrical rotor-stator clearance conditions. The results show that there may be different rubbing forms (local rubbing and full rubbing) and transient impact forces under four cases with rotating speeds. Rubbing stiffness has the greatest effects on the rubbing force, the amount of misalignment affects mainly the transient impact force and does not affect the normal rubbing force at the stable rubbing stage.

PL

Analizowano układ wirnika z dwoma dyskami. Symulowano tarcie między wirnikiem i stojanem a separacja była uwzględniana jako zmiana cylindrycznej szczeliny.

Słowa kluczowe

EN

rubbing; flexible rotor model; finite element method; misalignment

PL

wirnik; stojan; układ wirujący

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Przegląd Elektrotechniczny
• Rocznik: 2012
• Tom: R. 88, nr 9b
• Strony: 145--149
• Opis fizyczny: Bibliogr. 11 poz., rys., tab.

Twórcy

autor

Ma H.

• Northeastern University

autor

Tai X.

• Northeastern University

autor

Zhang Z.

• Northeastern University

autor

Wen B.

• Northeastern University

Bibliografia

• [1] Muszynska A., Rotordynamics, CRC Press, Boca Raton (2005)
• [2] Ehrich F.,High-order subharmonic response of high-speed rotors in bearing clearance, Journal of Vibration Acoustics Stress and Reliability in Design-Transactions of the ASME,110 (1988),9–16
• [3] Nelson H. and Mcvaugh J., The dynamics of rotor-bearing systems using finite elements, ASME Journal of Engineering for Industry, 98 (1976),No. 2,593–600
• [4] Belytschko T., Liu W. K.and Moran B., Nonlinear Finite elements for continua and structures, John Wiley & Sons Ltd, New York (2000).
• [5] J. C. Simo and T. A. Laursen, Computers and structures 42, 97 (1992).
• [6] Laursen T. A., Computational Contact and Impact Mechanics： Fundamentals of Modeling Interfacial Phenomena in Nonlinear Finite Element Analysis, Springer, Berlin (2003).
• [7] Wriggers P., Computational Contact Mechanics, Wiley, New York (2002).
• [8] Qin F., Chen L. M., Y. Li and Zhang X. F., Fundamental frequencies of turbine blades with geometry mismatch in fir-tree attachments, ASME Journal of Turbomachinery,128 (2006), 512-516.
• [9] Xu D. Q., A new node-to-node approach to contact/impact problems for two dimensional elastic solids subject to finite deformation. PhD Thesis, The University of Illinois at Urbana-Champaign, (2008).
• [10] Chen S., Geradin M., Finite element simulation of non-linear transient response due to rotor-stator contact, Engineering Computations,14 (1997),No. 6, 591-603
• [11] S. Roques, M. Legrand, P. Cartraud, C. Stoisser and C. Pierre, Modeling of a rotor speed transient response with radial rubbing, Journal of Sound and Vibration, 329 (2010),527-546