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Research Papers: Hydrodynamic Lubrication

Theoretical and Experimental Study on Dynamic Coefficients and Stability for a Hydrostatic/Hydrodynamic Conical Bearing

[+] Author and Article Information
Guo Hong1

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. Chinagghhletter@zzu.edu.cn

Lai Xinmin

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

Cen Shaoqi

School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, P. R. China

1

Corresponding author.

J. Tribol 131(4), 041701 (Sep 21, 2009) (7 pages) doi:10.1115/1.3176991 History: Received November 20, 2008; Revised May 27, 2009; Published September 21, 2009

This paper presents a theoretical study and experimental method to recognize the dynamic performance (stiffness and damping coefficients) of an externally pressurized deep/shallow pockets hybrid conical bearing compensated by flat capillary restrictors. The equations governing the flow of fluid film in the conical bearing together with the pressure boundary condition and the restrictor flow equation are solved by using the finite element method. A delicate test rig is constructed and bearings having a big end diameter of 97 mm, a length of 90 mm, and a radial clearance of 0.02–0.025 mm are analyzed. It is assumed that the fluid film force of the hydrostatic/hydrodynamic conical bearing is characterized by a set of linear stiffness and damping coefficients. The experiment used the impulse excitation method to recognize these coefficients and established their characteristics under different operating conditions. Numerical results are compared with the experimental results. The stability parameters of hybrid conical, hydrodynamic, and hydrostatic bearings are compared. The results show that the hybrid conical bearing has the advantages of high load carrying capability and high stability under small eccentricity.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Conical bearing configurations

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Figure 2

Boundary condition and restrictor flow equation

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Figure 3

(a) Schematic of the test rig; (b) test rig

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Figure 4

Outline of loading system and sensors locations

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Figure 5

Dimensionless direct stiffness coefficients k¯xx, k¯yy, and k¯zz

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Figure 6

Dimensionless cross-coupled stiffness coefficients k¯xy, k¯xz, k¯yx, k¯yz, k¯zx, and k¯zy

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Figure 7

Dimensionless direct damping coefficients b¯xx, b¯yy, and b¯zz

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Figure 8

Dimensionless cross-coupled damping coefficients b¯xy, b¯xz, b¯yx, b¯yz, b¯zx, and b¯zy

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