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Research Papers: Hydrodynamic Lubrication

Performance Analysis of Multirecess Angled-Surface Slot-Compensated Conical Hydrostatic Bearing

[+] Author and Article Information
Sheng-Yi Li

e-mail: syli@nudt.edu.cn
College of Mechatronics Engineering and
Automation,
National University of Defense Technology,
Changsha, 410072, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the Journal of Tribology. Manuscript received October 14, 2012; final manuscript received April 20, 2013; published online June 4, 2013. Assoc. Editor: Daniel Nélias.

J. Tribol 135(4), 041701 (Jun 04, 2013) (10 pages) Paper No: TRIB-12-1178; doi: 10.1115/1.4024296 History: Received October 14, 2012; Revised April 18, 2013

Angled-surface slot-compensated hydrostatic bearing (ASHB) is a novel type of hydrostatic bearing which is potentially applicable in rotary tables. However, it has not been sufficiently studied in available literature. In this paper the mathematic model for ASHB was built and solved by the finite element method (FEM). The influence of semicone angle on static and dynamic performance characteristics was theoretically investigated. The simulated results have been compared with that of the traditional fixed slot-compensated hydrostatic bearing (FSHB) on the same geometric and operating conditions. Results show that the performance of ASHB is better than that of FSHB; the studied bearing with a large semicone angle is superior in power consumption; the clearance width ratio of the restricting gap to the bearing gap has an obvious effect on bearing performance.

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Figures

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Fig. 1

Two types of four-recess slot-compensated hydrostatic bearing: 1 supply hole; 2 circular channel; 3 restricting slot; 4 recess; and 5 bearing land

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Fig. 2

Normalized finite element mesh of ASHB

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Fig. 3

Schematic diagram of the fluid film thickness

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Fig. 5

Comparison of simulation results with experiment

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Fig. 6

Variation of maximum fluid film pressure with displacement: (a) Radial motion and (b) axial motion

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Fig. 7

Variation of load carrying capacity with displacement: (a) Radial load versus radial displacement; (b) axial load versus axial displacement; (c) axial load versus radial displacement; and (d) radial load versus axial displacement

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Fig. 8

Variation of fluid flow rate with displacement: (a) Radial motion and (b) axial motion

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Fig. 9

Variation of direct stiffness coefficients with displacement: (a) S¯xx-ɛ; (b) S¯yy-ɛ; and (c) S¯zz-ς

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Fig. 10

Variation of direct damping coefficients with displacement: (a) C¯xx-ɛ; (b) C¯yy-ɛ; and (c) C¯zz-ς

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