This paper presents a nonlinear stability analysis of an unbalanced rotor-bearing system using the numerical continuation method and the numerical integration method. In this study, the effect of unbalance on journal motion is highlighted and a relationship is established between the bifurcation diagram of a balanced rotor and that of an unbalanced rotor. The results show that the stable operating speed range, the shaft motion type, the whirl speed and the chaotic motion occurrence depend on the unbalance level, the bearing geometry, the oil viscosity, and the speed range of unstable limit cycles existence.
Revised:
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Radhouane Sghir 1, 2
CC-BY 4.0
@article{CRMECA_2021__349_2_371_0,
author = {Radhouane Sghir},
title = {Unbalance-induced whirl of a rotor supported by oil-film bearings},
journal = {Comptes Rendus. M\'ecanique},
pages = {371--389},
publisher = {Acad\'emie des sciences, Paris},
volume = {349},
number = {2},
year = {2021},
doi = {10.5802/crmeca.83},
language = {en},
}
Radhouane Sghir. Unbalance-induced whirl of a rotor supported by oil-film bearings. Comptes Rendus. Mécanique, Volume 349 (2021) no. 2, pp. 371-389. doi : 10.5802/crmeca.83. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.5802/crmeca.83/
[1] Analysis of limit-cycle response in fluid-film journal bearings using the method of multiple scales, Q. J. Mech. Appl. Math., Volume 38 (1985), pp. 1258-1264 | DOI | MR | Zbl
[2] Bifurcation theory applied to oil whirl in plain cylindrical journal bearings, J. Appl. Mech., Volume 51 (1984), pp. 244-250 | DOI | Zbl
[3] On the hysteresis phenomenon associated with instability of rotor-bearing systems, J. Tribol., Volume 128 (2005), pp. 188-196 | DOI
[4] Characteristics of the nonlinear hysteresis loop for rotor-bearing instability, 1995 (Dissertation, Case Western Reserve University)
[5] Analytical bifurcation analysis of a rotor supported by floating ring bearings, Nonlinear Dyn., Volume 57 (2009), pp. 497-507 | DOI | Zbl
[6] Stability and bifurcation analysis of a flexible rotor-bearing system by numerical continuation, 10th International Conference on Vibrations in Rotating Machinery (2012) | DOI
[7] Prediction of the nonlinear hysteresis loop for fluid-film bearings by numerical continuation, Proc. Inst. Mech. Eng. C, Volume 229 (2015), pp. 651-662 | DOI
[8] Nonlinear stability analysis of a flexible rotor-bearing system by numerical continuation, J. Vib. Control, Volume 22 (2016), pp. 3079-3089 | DOI | MR
[9] Observations of subcritical superharmonic and chaotic response in rotordynamics, J. Vib. Acoust., Volume 114 (1992), pp. 93-100 | DOI
[10] Parametric excitation instability of a rigid unbalanced rotor in short turbulent journal bearings, Proc. Inst. Mech. Eng. C, Volume 207 (1993), pp. 149-160 | DOI
[11] Some observations of chaotic vibration phenomena in high-speed rotordynamics, J. Vib. Acoust., Volume 113 (1991), pp. 50-57 | DOI
[12] Conditions for noncircular whirling of nonlinear isotropic rotors, Nonlinear Dyn., Volume 4 (1993), pp. 153-181
[13] Mode-locking and chaos in a jeffcott rotor with bearing clearances, J. Appl. Mech., Volume 61 (1994), pp. 131-138 | DOI | Zbl
[14] Chaotic motions of a rigid rotor in short journal bearings, Nonlinear Dyn., Volume 10 (1996), pp. 251-269 | DOI | Zbl
[15] Nonlinear dynamics of a rigid unbalanced rotor in journal bearings. Part I: theoretical analysis, Nonlinear Dyn., Volume 14 (1997), pp. 57-87 | DOI | Zbl
[16] Nonlinear dynamics of a rigid unbalanced rotor in journal bearings, Part II: experimental analysis, Nonlinear Dyn., Volume 14 (1997), pp. 157-189 | DOI | Zbl
[17] Nonlinear behavior analysis of a rotor on two-lobe wave journal bearings, Tribol. Int., Volume 44 (2011), pp. 42-54 | DOI
[18] Periodic, quasi-periodic and chaotic vibrations of a rub-impact rotor system supported on oil film bearings, Int. J. Eng. Sci., Volume 35 (1997), pp. 963-973 | DOI | Zbl
[19] Nonlinear phenomena, bifurcations, and routes to chaos in an asymmetrically supported rotor–stator contact system, J. Sound Vib., Volume 336 (2015), pp. 207-226 | DOI
[20] Nonlinear dynamic analysis using the complex nonlinear modes for a rotor system with an additional constraint due torub-impact, Mech. Syst. Signal Process., Volume 116 (2019), pp. 443-461 | DOI
[21] Chaotic response of a short journal bearing, Proc. Inst. Mech. Eng. J., Volume 214 (2000), pp. 387-400 | DOI
[22] Study of effect of unbalanced forces for high speed rotor, Proc. Eng., Volume 64 (2013), pp. 593-602 | DOI
[23] Bifurcation in a flexible rotor supported by short journal bearings with nonlinear suspension, J. Vib. Control, Volume 7 (2001), pp. 653-673 | DOI | Zbl
[24] Nonlinear dynamic analysis of a rotor-bearing-seal system under two loading conditions, J. Sound Vib., Volume 332 (2013), pp. 6128-6154 | DOI
[25] Effects of eccentric phase difference between two discs on oil-film instability in a rotor-bearing system, Mech. Syst. Signal Process., Volume 41 (2013), pp. 526-545 | DOI
[26] Numerical and experimental analysis of the first-and second-mode instability in a rotor-bearing system, Arch. Appl. Mech., Volume 84 (2014), pp. 519-541 | DOI | Zbl
[27] Oil-film instability simulation in an overhung rotor system with flexible coupling misalignment, Arch. Appl. Mech., Volume 85 (2015), pp. 893-907 | DOI
[28] Hydrodynamic Lubrication Bearings and Thrust Bearings, Elsevier, Amsterdam, 1997 | Zbl
[29] Applied Nonlinear Dynamics, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 1995
[30] Nonlinear computation, J. Franklin Inst., Volume 334 (1997), pp. 1015-1047 | DOI | MR | Zbl
[31] Elements of Applied Bifurcation Theory, Springer-Verlag, New York, 1998 | Zbl
[32] Matcont: A Matlab package for numerical bifurcation analysis of ODEs, ACM Trans. Math. Softw., Volume 29 (2003), pp. 141-164 | DOI | MR | Zbl
[33] Earthquake-induced instability of a rotor supported by oil film bearings, J. Vib. Acoust., Volume 112 (1990), pp. 160-265 | DOI
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