Effect of Aspect Ratio of Noncircular Lobed Journal Bearings on the Damping Effectiveness of Lubricant in Case of Rotor Disturbances

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

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Journal: Modares Mechanical Engineering Year:2020 | Volume:20 | Issue:5 Page(s): 1347-1360

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Title

Effect of Aspect Ratio of Noncircular Lobed Journal Bearings on the Damping Effectiveness of Lubricant in Case of Rotor Disturbances

Author(s)

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

Keywords

Aspect RatioQ2

Dynamic StabilityQ2

Noncircular Lobed Journal BearingsQ1

Micropolar LubricantQ2

Linear and Nonlinear AnalysisQ2

Abstract

The lubricant’ s ability to maintain the Dynamic Stability of rotor particularly in special conditions such as operating at critical speeds and instantaneous turbulences in loading or lubricant properties is always one of the most prominent characteristics of the journal bearings. The Aspect Ratio of length to diameter ratio of bearing is an important factor that in different loading conditions will have an obvious effect on the performance of the trapped lubricant film between the rotor surface and bearings shell. So, in this research, the effects of Aspect Ratio on the damping of rotor disturbances in the noncircular two, three and four-lobe bearings space with linear and nonlinear dynamic analysis approaches are studied. Initially, the static equilibrium point of the rotor center in bearings space has been obtained using the governing Reynolds equation of micropolar lubrication for different values of Aspect Ratio. Later, assuming the rotor perturbation as the limit cycle oscillations around the equilibrium point, critical mass and whirl frequency ratio are determined as the linear Dynamic Stability indexes for recognizing the converging disturbances. In the nonlinear model, the simultaneous solving of the lubrication and the rotor motion equations in successive time steps with the Runge-Kutta method is done to differentiate the converging or diverging rotor perturbations. Results show that decreasing the Aspect Ratio improves the dynamical stability and the chance of controlling disturbances and returning the rotor center to the static equilibrium position. A comparison of linear and nonlinear dynamic analysis results also indicates more cautious behavior and limited dynamical stability range of the linear model in most of the Aspect Ratio.

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APA: Copy

ZARE MEHRJARDI, M., DASHTI RAHMATABADI, A., & RASOOLIZADEH SHOOROKI, A.. (2020). Effect of Aspect Ratio of Noncircular Lobed Journal Bearings on the Damping Effectiveness of Lubricant in Case of Rotor Disturbances. MODARES MECHANICAL ENGINEERING, 20(5 ), 1347-1360. SID. https://sid.ir/paper/178553/en

Vancouver: Copy

ZARE MEHRJARDI M., DASHTI RAHMATABADI A., RASOOLIZADEH SHOOROKI A.. Effect of Aspect Ratio of Noncircular Lobed Journal Bearings on the Damping Effectiveness of Lubricant in Case of Rotor Disturbances. MODARES MECHANICAL ENGINEERING[Internet]. 2020;20(5 ):1347-1360. Available from: https://sid.ir/paper/178553/en

IEEE: Copy

M. ZARE MEHRJARDI, A. DASHTI RAHMATABADI, and A. RASOOLIZADEH SHOOROKI, “Effect of Aspect Ratio of Noncircular Lobed Journal Bearings on the Damping Effectiveness of Lubricant in Case of Rotor Disturbances,” MODARES MECHANICAL ENGINEERING, vol. 20, no. 5 , pp. 1347–1360, 2020, [Online]. Available: https://sid.ir/paper/178553/en

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