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Research Papers

Analytical Coupled Modeling and Model Validation of Hydraulic On/Off Valves

[+] Author and Article Information
John Mahrenholz

Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907jmahrenh@purdue.edu

John Lumkes

Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907lumkes@purdue.edu

J. Dyn. Sys., Meas., Control 132(1), 011005 (Dec 03, 2009) (10 pages) doi:10.1115/1.4000072 History: Received December 04, 2008; Revised July 22, 2009; Published December 03, 2009; Online December 03, 2009

The goal of this paper is to describe a method for modeling high speed on/off valves. This model focuses on the nonlinearities of the electromagnetic, fluidic, and mechanical domains, specifically within solenoid driven poppet style valves. By including these nonlinearities, the model accurately predicts valve transition time for different driving voltages and valve strokes. The model also predicts fluid transients such as pressure ripple. Unique attributes of the model are the inclusion of the effect of eddy currents and fringing while still being fully coupled with the fluid and mechanical domains. A prototype was constructed and used to experimentally validate the model. By developing accurate lumped parameter models, valve dynamics can be applied to hydraulic systems to accurately capture their dynamics.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Prototype description

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Driving circuitry

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Figure 5

IRS2117 MOSFET driver schematic

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Figure 6

Node locations and electromagnetic geometry

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Figure 7

Flow passage dimensions

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Figure 8

Free-body diagram

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Figure 9

Valve optimization flow chart

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Figure 10

(a) Laser test setup and (b) prototype

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Figure 11

Hydraulic test circuit

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Figure 12

Fluid test setup

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Figure 13

Poppet transition profile at 140 V, 60 V, and 20 V

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Figure 14

Poppet transition profile at 0.20 mm, 0.25 mm, and 0.30 mm strokes

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Figure 15

Outlet pressure profile at 24LPM

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