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Research Papers

Suppression of Rubbing in Rotating Machines by Lemon-Type Bearing

[+] Author and Article Information
Enaiyat Ghani Ovy

Islamic University of Technology,
Board Bazar,
Gazipur 1704, Bangladesh
e-mail: enaiyat1@iut-dhaka.edu

1Present address: University of Alberta, Canada.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the Journal of Vibration and Acoustics. Manuscript received August 19, 2018; final manuscript received May 15, 2019; published online June 17, 2019. Assoc. Editor: Costin Untaroiu.

J. Vib. Acoust 141(5), 051014 (Jun 17, 2019) (16 pages) Paper No: VIB-18-1359; doi: 10.1115/1.4043817 History: Received August 19, 2018; Accepted May 15, 2019

Rotor-to-stator or rotor-to-guide rubbing in rotating machines is a serious problem. The contact (rub and impact) between the rotor and the guide creates an excessive vibration which may lead to permanent damage of the mechanical system. In the present work, the rubbing phenomenon between the rotor and the guide is investigated by simulation and experiment. Two different types of clearance bearings are implemented, which are based on circular and lemon-type guides. Rigorous mathematical models for the lemon-type guide as well as for the traditional circular clearance bearing are derived. Then, a Jeffcott rotor model is simulated for the investigation of the rubbing behavior for the two types of bearings. The numerical model is developed in matlab simulink. For different clearances and friction levels between rotor and guide, and several initial conditions, the rubbing phenomena are studied and evaluated. Finally, a comparison between experimental and simulation work is carried out to validate the overall scenarios in this research work. Results indicate that the lemon-type bearing can reduce the likelihood of sustained rubbing, compared with the circular clearance bearing, for the considered test cases.

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References

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Figures

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Fig. 1

Rubbing types: (a) forward rub and (b) backward rub

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Fig. 2

Photograph of the experimental setup (left) and its schematic shows dimensions in millimeters (right)

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Fig. 3

Block diagram of the overall experimental procedure

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Fig. 4

Mathematical model for a rotor-guide system

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Fig. 6

Resonance curves for δ = 0.3 with different friction coefficients for circular clearance bearing

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Fig. 7

Whirling speed diagrams for δ = 0.3 with two friction coefficients for circular clearance bearing

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Fig. 8

Phase diagrams for δ = 0.3 with varying friction coefficients for circular clearance bearing

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Fig. 9

Resonance curves for δ = 0.2 with different friction coefficients for circular clearance bearing

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Fig. 10

Whirling speed diagrams for δ = 0.2 with two friction coefficients for circular clearance bearing

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Fig. 11

Phase diagrams for δ = 0.2 with varying friction coefficients for circular clearance bearing

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Fig. 12

Resonance curves for δ = 0.1 with different friction coefficients for circular clearance bearing

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Fig. 13

Whirling speed diagrams for δ = 0.1 with two friction coefficients for circular clearance bearing

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Fig. 14

Phase diagrams for δ = 0.1 with varying friction coefficients for circular clearance bearing

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Fig. 15

Comparison between lemon and circular type bearing for δ = 0.3

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Fig. 16

Comparison between lemon and circular type bearing for δ = 0.2

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Fig. 17

Comparison between lemon and circular type bearing for δ = 0.1

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Fig. 18

Whirling speed (left) and phase diagram (right) for lemon-type bearing R = 0.5, a = 0.4, μ = 0

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Fig. 19

Showing rotor orbits when the clearance is 0.1 (left), 0.2 (center), and 0.3 (right)

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Fig. 20

Showing rotor orbits when the nearest gap between rotor and guide is 0.1 (left), 0.2 (center), and 0.3 (right)

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Fig. 21

Experimental results of circular type bearing with different disk thicknesses

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Fig. 22

Implementation of lemon-type guide in the experiment

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Fig. 23

Experimental results of lemon-type bearing with different disk thicknesses

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