Processing Transient Response of a Flexible Rotor-Bearing System with Unbalanced Disk

• Autorzy: Attia Hili M. , Bouaziz S. , Maatar M. , Fakhfakh T. , Haddar M.
• Języki publikacji: EN

Abstrakty

EN

Turbomachinery rotors are frequently supported on several oil lubricating bearings and so are statically indeterminate. In such cases, the bearings reaction forces and hence their stiffness and damping properties affect the relative location of the bearing centres, thereby significantly the vibration behaviour of the rotor bearing system. In this paper, the dynamic behaviour of symmetrical rotor bearing system with unbalanced disk is analyzed based on a continuum model. The finite difference method is employed with the successive over relaxation technique to solve the Reynolds equation. The finite element method with an iteration scheme is adopted in the analysis of the system state trajectories. Bearing's stiffness and damping are considered. The motions of journal and disk have been simulated with Newmark method. Linear transient simulation, with time integration procedure, and unbalanced responses are investigated. The present results provide a deeper understanding to predict undesirable behaviour of the rotor and bearings centres can be avoided.

Słowa kluczowe

EN

unbalanced response; HD bearing; EHD bearing; trajectory; orbit; spectrum; stiffness; damping coefficient

• Wydawca: Oficyna Wydawnicza Politechniki Warszawskiej
• Czasopismo: Machine Dynamics Research
• Rocznik: 2010
• Tom: Vol. 34, No. 1
• Strony: 23--37
• Opis fizyczny: Bibliogr. 18 poz., wykr.

Twórcy

autor

Attia Hili M.

autor

Bouaziz S.

autor

Maatar M.

autor

Fakhfakh T.

autor

Haddar M.

• National School of Engineers of Sfax, Sfax-Tunisia

Bibliografia

• Attia Hili, M., Bouaziz, S., Maatar, M., Fakhfakh, T., Haddar, M., 2010, Hydrodynamic and elastohydrodynamic studies of a cylindrical journal bearing, Journal of hydrodynamics, 22, 2, 155-163.
• Bouaziz, S., Attia Hili, M., Maatar, M., Fakhfakh T., Haddar, M., 2009, Dynamic behaviour of hydrodynamic journal bearings in presence of rotor spatial angular misalignment, Mechanism and Machine Theory, 44, 1548-1559.
• Bouaziz, S., Maatar, M., Fakhfakh, T., Haddar, M., 2007, Unbalance and gear mesh effects on the dynamic behaviour of hydrodynamic journal bearings, Advances in Computer Science and Engineering, Volume 1, Issue 2, 169-187.
• Brancati R., Rocca E., Russo M., Russo R., 1995, Journal orbits and their stability for rigid unbalanced rotors, Journal Tribology, 117 (4), 709-716.
• Bukovnik, S., Dorr, N., Ćaika, V., Bartz, W. J., Loibnegger, B., 2006, Analysis of diverse simulation models for combustion engine journal bearings and the influence of oil condition, Tribology International, 39, 8, 820-826.
• Byoung-Hoo Rho, Kyung-Woong Kim., 2003, Acoustical properties of hydrodynamic journal bearings, Tribology International, 36, 61-66.
• Cai-Wan Chang-Jian, Chao-Kuang Chen, 2006., Nonlinear dynamic analysis of a flexible rotor supported by micropolar fluid film journal bearings, International Journal of Engineering Science, 44, 15-16, 1050-1070.
• Chen W. J., 1994, Instability threshold and stability boundaries of rotor-bearing systems. Engineering System Design and Analysis, ASME, 7, 211-218.
• Chen Z. B., Jiao Y. H., Xia S. B., Huang W. H., Zhang Z. M., 2002, An efficient calculation method of nonlinear fluid film forces in journal bearing, Tribology Transaction, 45 (3), 324-329.
• Crooijmans M. T. M., Brouwers H. J. H, Campen D. H. V, Kraker A. D., 1990, Limit cycle predictions of a nonlinear journal-bearing system, Journal of Engineering Industrial, 112(2), 168-171.
• Lund J. W., 1987, Review of the concept for dynamic coefficients for fluid film journal bearings, Journal Tribology, 109, 37-41.
• Prabhakaran Nair, K., Sukumaran Nair, V. P., Jayadas, N. H., 2007, Static and dynamic analysis of elastohydrodynamic elliptical journal bearing with micropolar lubricant, Tribology International, 40, 297-305.
• Rao T. V. V. L. N., Biswas S., Hirani H., Athre K., 2000, An analytical approach to evaluate dynamic coefficients and nonlinear transient analysis of a hydrodynamic journal bearing, Tribology Transaction, 43 (1), 109-115.
• Sanxing Zhao, Hua Xu, Guang Meng, Jun Zhu, 2005, Stability and response analysis of symmetrical single-disk flexible rotor-bearing system, Tribology International, 38, 749-756.
• Sukumaran Nair, V. P., Prabhakaran Nair, K., 2004, Finite element analysis of elastohydrodynamic circular journal bearing with micropolar lubricants, Finite Elements in Analysis and Design, 41, 75-89.
• Villa, C., Sinou, J.-J., Thouverez, F., 2008, Stability and vibration analysis of a complex flexible rotor bearing system, Communications in Nonlinear Science and Numerical Simulation, 13, 4, 804-821.
• XU, M., Marangoni, R. D., 1994, Vibration analysis of a motor-flexible coupling-rotor system subject to a misalignment and unbalance, part II: experimental validation, Journal of Sound and Vibration, 176, 681-691.
• XU, M., Marangoni, R. D., 1994, Vibration analysis of a motor-flexible coupling-rotor system subject to a misalignment and unbalance, part I: theoretical model and analysis, Journal of Sound and Vibration, 176, 663-679.