Load Effect on the Lubricant Ability in Damping the Perturbed Oscillations of an Unbalanced Rotor in Three Lobe Journal Bearings

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ZARE MEHRJARDI M.; DASHTI RAHMATABADI A.; RASOOLIZADEH SHOOROKI A.

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Paper Information

Journal: Journal of Aerospace Mechanics Year:2020 | Volume:16 | Issue:3 (61) Page(s): 35-48

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Title

Load Effect on the Lubricant Ability in Damping the Perturbed Oscillations of an Unbalanced Rotor in Three Lobe Journal Bearings

Author(s)

ZARE MEHRJARDI M. | DASHTI RAHMATABADI A. | RASOOLIZADEH SHOOROKI A. | Issue Writer Certificate

Keywords

Dynamic behaviorQ1

Three lobe journal bearingQ1

Mass unbalanceQ1

EccentricityQ1

Bifurcation diagramQ1

Abstract

Oscillating disturbances of rotors in the turbo-machines, compressors, combustion engines and other rotary equipments are affected by various factors, such as the Mass unbalance of parts, which cause the wear and collision between the rotor and bearing surfaces. This phenomenon always leads to the failure of elements and interruptions at work of the equipments. Today, hydrodynamic journal bearings are the most common type of rotor supports in rotary machines. Therefore, improving the ability of these supports in control of the rotor fluctuations, as an effective factor in enhancing the overall efficiency of the rotating systems, is important. In this study, the effect of external load, as an Eccentricity ratio indicator of Mass unbalanced rotor in the bearing clearance space, on the Dynamic behavior of noncircular three lobe bearings with micropolar lubricant is investigated. For this purpose, the governing Reynolds equation and the equation of rotor motion have been rewritten and evaluated using FEM and 4 th order Runge-Kutta methods in static conditions and successive time steps after the occurrence of rotor disturbances. The results indicate that the amplitude and intensity of rotor disturbances are developed in the forms of periodic, KT periodic and quasi-periodic motions in the moderate values of Eccentricity ratio and they are changed to limit cycle oscillations with small amplitude in low or especially high Eccentricity ratios.

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APA: Copy

ZARE MEHRJARDI, M., DASHTI RAHMATABADI, A., & RASOOLIZADEH SHOOROKI, A.. (2020). Load Effect on the Lubricant Ability in Damping the Perturbed Oscillations of an Unbalanced Rotor in Three Lobe Journal Bearings. AEROSPACE MECHANICS JOURNAL, 16(3 (61) ), 35-48. SID. https://sid.ir/paper/374015/en

Vancouver: Copy

ZARE MEHRJARDI M., DASHTI RAHMATABADI A., RASOOLIZADEH SHOOROKI A.. Load Effect on the Lubricant Ability in Damping the Perturbed Oscillations of an Unbalanced Rotor in Three Lobe Journal Bearings. AEROSPACE MECHANICS JOURNAL[Internet]. 2020;16(3 (61) ):35-48. Available from: https://sid.ir/paper/374015/en

IEEE: Copy

M. ZARE MEHRJARDI, A. DASHTI RAHMATABADI, and A. RASOOLIZADEH SHOOROKI, “Load Effect on the Lubricant Ability in Damping the Perturbed Oscillations of an Unbalanced Rotor in Three Lobe Journal Bearings,” AEROSPACE MECHANICS JOURNAL, vol. 16, no. 3 (61) , pp. 35–48, 2020, [Online]. Available: https://sid.ir/paper/374015/en

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