Backward Whirl and Its Suppression of a Squeeze Film Damper Mounted Rotor/Casing System in Passage through Critical Speed with Rubs

Abstract

In this paper we consider a flexible Jeffcott rotor mounted at the ends by identical squeeze film dampers (SFDs). The rotative speed is supposed to increase at a constant angular acceleration. There can be one-peak and two-peak solutions for different values of SFD parameters during passage through the critical speed. Calculation shows that the rotor cannot pass through the critical speed due to the occurrence of diverging backward whirl in passage of the first or second peak, if the level of acceleration is lower than the critical ones. A flexible internal support, which can be activated or deactivated at a certain position along the rotor to change the stiffness of the system to suppress large vibration, is then applied to avoid the occurrence of backward whirl. The method is found to be effective if applied in a suitable way

Keywords

Rotor/casing system rub backward whirl suppression

Get full access to this article

View all access options for this article.

References

Chen, S. L. and Gerading, M. , 1997, "Finite element simulation of nonlinear transient response due to rotor-stator contact," Engineering Computation 14, 591-598 .

Choy, F K. and Padovan, J. , 1987, "Nonlinear transient analysis of rotor-casing rub events," Journal of Sound and Vibration 113, 529-545 .

Chu, F L. and Zhang, Z. S. , 1998, "Bifurcation and chaos in a rub-impact Jeffcott rotor system," Journal of Sound and Vibration 210, 1-18 .

Ding, Q. and Chen, Y. S. , 2001, "Non-stationary motion and instability of a shaft/casing system with rubs," Journal of Vibration and Control 7, 327-338 .

Li, G. X. and Paidoussis, M. P , 1994, "Impact phenomena of rotor-casing dynamical systems," Nonlinear Dynamics 5, 53-70 .

Mclean, T J. and Hahn, E. J. , 1983, "Unbalance behavior of squeeze film damped multi-mass flexible rotor bearing systems," ASME Joutnal of Lubrication Technology 105, 22-28 .

Muszynska, A. , 1989, "Rotor-to-stationary element rub-related vibration phenomena in rotating machinery-literature survey," Shock and Vibration Digest 21, 3-11 .

Nagaya, K. , Takeda, S. , Tsukui, Y. , and Kumaido, T. , 1983, "Active control method for passing through critical speeds of rotating shafts by changing stiffnesses of the supports with use of memory metals," Journal of Sound and Vibration 113, 307-315 .

Suherman, S. and Plaut, R. H. , 1997, "Use of a flexible internal support to suppress vibration of a rotating shaft passing through a critical speed," Journal of Vibration and Control 3, 213-233 .

10.

Yanabe, S. , Kaneko, S. , Kanemitsu, Y. , Tomi, N. , and Sugiyama, K. , 1998, "Rotor vibration due to collision with annular guard during passage through critical speed," ASME Journal of Vibration and Acoustics 120, 544-550 .

11.

Yao, G. Z. and Meng, G. , 1999, "Vibration control of a rotor system by disk type electrorheological damper," Journal of Sound and Vibration 219, 175-188 .

12.

Wang, J. X. and Meng, G. , 2001, "Application of magnetorheological fluid damper in rotor vibration control," Chinese Journal of Chemical Physics 14, 548-554 (in Chinese).