Numerical Model of a Reciprocating Hydraulic Rod Seal

[+] Author and Article Information
Richard F. Salant, Nicholas Maser, Bo Yang

George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405

J. Tribol 129(1), 91-97 (Oct 03, 2006) (7 pages) doi:10.1115/1.2401222 History: Received March 10, 2006; Revised October 03, 2006

A numerical model of an elastomeric reciprocating hydraulic rod seal has been constructed. The model consists of coupled fluid mechanics, deformation mechanics, and contact mechanics analyses, with an iterative computational procedure. The fluid mechanics analysis consists of the solution of the Reynolds equation, using flow factors to account for surface roughness. Deformation of the seal is computed through the use of influence coefficients, obtained from an off-line finite element analysis. The contact mechanics analysis uses the Greenwood and Williamson model. The seal model is used to predict leakage rate, friction force, fluid and contact pressure distributions, and film thickness distribution. Results for a typical seal show that the seal operates with mixed lubrication, and the seal roughness plays an important role in determining whether or not the seal leaks.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Schematic of seal

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Figure 3

Computational procedure

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Figure 4

Film thickness distributions, base case

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Figure 5

Pressure distributions, base case, outstroke

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Figure 6

Pressure distributions, base case, instroke

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Figure 7

Frictional shear stress distributions, base case

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Figure 8

Flow rate/speed versus roughness, base case speeds

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Figure 9

Flow rate/speed versus speed for 1.857 and 3.713 roughness (0.4 and 0.8μm)

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Figure 10

Pressure distributions, 3.713 roughness (0.8μm), base speed, outstroke

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Figure 11

Pressure distributions, 3.713 roughness (0.8μm), base speed, instroke

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Figure 12

Film thickness distributions, 3.713 roughness (0.8μm), base speeds



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