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Research Papers: Elastohydrodynamic Lubrication

Experimental Determination and Analytical Model of Friction Torque of a Double Row Roller Slewing Bearing

[+] Author and Article Information
Ahmet Dindar

Department of Mechanical Engineering,
Middle East Technical University,
Ankara 06800, Turkey
e-mail: e162854@metu.edu.tr

Metin Akkök

Professor
Department of Mechanical Engineering,
Middle East Technical University,
Ankara 06800, Turkey
e-mail: akkok@metu.edu.tr

Mehmet Çalışkan

Professor
Department of Mechanical Engineering,
Middle East Technical University,
Ankara 06800, Turkey
e-mail: caliskan@metu.edu.tr

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 13, 2016; final manuscript received March 29, 2016; published online August 11, 2016. Assoc. Editor: George K. Nikas.

J. Tribol 139(2), 021503 (Aug 11, 2016) (13 pages) Paper No: TRIB-16-1020; doi: 10.1115/1.4033364 History: Received January 13, 2016; Revised March 29, 2016

In this paper, investigation on the friction torque of a double row roller slewing bearing which is operated in the azimuth axis of a gun turret is performed. For this purpose, a friction measurement test setup is designed and friction torque measurements are conducted. Tests are performed at low speeds and various loading conditions. Friction sources are decoupled and examined separately in order to fully understand effect of each component on friction torque of the slewing bearing. Therefore, friction caused by rolling motion and friction caused by two different types of lip seals are investigated. In addition, friction identification analyses are performed. In the analysis, load distribution of the bearing is calculated by finite element analysis software and rolling motion is simulated with a multibody-dynamic analysis program. In the end, analyses results are compared and verified with the test results.

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References

Dindar, A. , 2015, “ Experimental and Analytical Determination of Friction Torque of a Double Row Roller Slewing Bearing,” M.S. thesis, Middle East Technical University, Ankara, Turkey.
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Figures

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Fig. 1

Three wire-race double row roller slewing bearing

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Fig. 2

Friction measurement test setup

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Fig. 3

Friction measurement test setup assembly

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Fig. 4

Friction identification tests presented on test assembly motion transfer diagram

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Fig. 5

Combined loading tests

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Fig. 6

Axial loading tests

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Fig. 7

Internal friction of test setup

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Fig. 8

Friction torque as a function of rotational speed (load = 1400 N)

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Fig. 9

Friction torque as a function of axial load (speed = 0.030 rad/s)

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Fig. 10

Bearing inner friction torque as a function of rotational speed at different axial loads

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Fig. 11

Bearing inner friction torque as a function of axial load at different rotational speeds

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Fig. 12

Bearing inner friction torque as a function of tilting moment at different rotational speeds

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Fig. 13

Bearing inner friction torque as a function of tilting moment at different axial loads

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Fig. 14

Friction torque calculation procedure

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Fig. 15

Bearing modeling in ansys

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Fig. 16

Influence of contact force on inner raceway–roller–outer raceway contact deformation

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Fig. 17

Spring models in ansys

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Fig. 18

Load distribution of upper row rollers at different axial loads and at a constant tilting moment of 80 N·m

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Fig. 19

Load distribution of upper row rollers at different tilting moments and at a constant axial load of 2000 N

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Fig. 20

Load distribution of upper and lower row rollers (axial load = 800 N and tilting moment = 300 N·m)

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Fig. 21

Roller–raceway model

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Fig. 22

Modified regimes of lubrication for line contacts [19]

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Fig. 23

Comparison of test results with model results

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Fig. 24

Comparison of analysis and tests in axial loading

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Fig. 25

Comparison of analysis and test results—effect of axial load

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Fig. 26

Comparison of analysis and test results—effect of tilting moment

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Fig. 27

Comparison of analysis and test results—effect of rotational speed

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