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Research Papers: Elastohydrodynamic Lubrication

Visco-Elastohydrodynamic Model of a Hydraulic Rod Seal During Transient Operation

[+] Author and Article Information
Azam Thatte, Richard F. Salant

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

J. Tribol 132(4), 041501 (Oct 08, 2010) (13 pages) doi:10.1115/1.4002542 History: Received May 04, 2010; Revised August 24, 2010; Published October 08, 2010; Online October 08, 2010

A visco-elastohydrodynamic model of a hydraulic rod seal during transient operation has been developed. The model includes analyses of the macro- and microscale deformation mechanics and contact mechanics, and the microscale fluid mechanics. Viscoelasticity enters the analysis through the deformation mechanics and through the contact mechanics. A hybrid finite element-finite volume computational framework is developed to solve the highly coupled governing equations. Viscoelasticity is seen to affect the leakage and friction characteristics of the seal through its effects on the changing fluid pressure and contact pressure distributions as the rod velocity and sealed pressure change during a cycle. Compared with purely elastic behavior, viscoelasticity increases the fluid pressure and the contact pressure significantly in the sealing region closest to the sealed end, shifts the fluid pressure peaks away from the sealed end during the instroke, and enhances the cavitation during the outstroke. It results in thicker fluid films and produces a significant increase in the Poiseuille flow during the instroke.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of reciprocating hydraulic rod seal

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Figure 3

Deformed seal geometries and von Mises stress (MPa)

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Figure 4

Computational procedure

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Figure 5

Rod velocity history

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Figure 6

Sealed pressure history

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Figure 7

Fluid pressure distribution, outstroke

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Figure 8

Fluid pressure distribution, instroke

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Figure 9

Fluid pressure history, outstroke

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Figure 10

Fluid pressure history, instroke

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Figure 11

Fluid pressure history, outstroke, VE model with viscoelasticity suppressed, and LE model

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Figure 12

Film thickness distribution, outstroke

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Figure 13

Film thickness distribution, instroke

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Figure 14

Film thickness history, outstroke

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Figure 15

Film thickness history, instroke

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Figure 16

Contact pressure distribution, outstroke

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Figure 17

Contact pressure distribution, instroke

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Figure 18

Contact pressure history, outstroke

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Figure 19

Contact pressure history, instroke

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Figure 20

Contact pressure history, outstroke, VE model with viscoelasticity suppressed, and LE model

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Figure 21

Fluid transport out of cylinder versus time

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Figure 22

(a) Flow rate versus time, outstroke and (b) flow rate versus time, instroke

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Figure 23

Friction force on rod versus time

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Figure 24

Mean shear stress on rod versus time

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Figure 25

Sealing zone length versus time

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Figure 26

Sealing zone length versus time, VE model with viscoelasticity suppressed, and LE model

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Figure 2

Computational framework

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