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Research Papers

A Hydraulic Circuit for Single Rod Cylinders

[+] Author and Article Information
Longke Wang

 George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332longke.wang@gatech.edu

Wayne J. Book

 George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332wayne.book@me.gatech.edu

James D. Huggins

 George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332James.huggins@me.gatech.edu

J. Dyn. Sys., Meas., Control 134(1), 011019 (Dec 06, 2011) (11 pages) doi:10.1115/1.4004777 History: Received May 27, 2010; Revised May 14, 2011; Published December 06, 2011; Online December 06, 2011

This paper proposes a novel hydraulic circuit for a single rod cylinder controlled by a variable displacement pump. The circuit arrangement not only gives the system high energy efficiency but also improves upon the internal instability of traditional circuits. Stability is illustrated by comparing traditional circuits with the proposed circuit. The motivations, derivations, and proofs of the system dynamical stabilities are presented. Control algorithms including stability control and sliding to the desired working region are presented. Experiments are conducted to verify the circuit, and results show that the circuit has good performance.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Hydraulic circuit for a single rod cylinder

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Figure 2

(a) Positive direction definition, (b) Four quadrant working domain

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Figure 3

Single rod cylinder model

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Figure 4

Desired working regions in the pressure plane

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Figure 5

The circuit using pilot operated check valves

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Figure 6

Working regions of ideal P.O. Valves

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Figure 7

Working regions of common P.O. valves

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Figure 8

Working regions of the shuttle valve

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Figure 9

Block diagram around the equilibrium point

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Figure 10

Response with varying leakage coefficient

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Figure 11

Hydraulic lifter testbed

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Figure 12

Control structure

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Figure 13

(a) Pressure response; (b) position and velocity response

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Figure 14

(a) Pressure response with oscillations; (b) position and velocity response with oscillations

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Figure 15

Oscillations are inhibited by increasing leakage

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Figure 16

Experiment responses (M = 0 Kg)

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Figure 17

Experiment responses (M = 61.2 Kg)

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Figure 18

Experiment responses (M = 142.8 Kg)

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Figure 19

Simulation result with M = 60.2 Kg

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Figure 20

Experiment responses with compensations (M = 0 Kg)

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Figure 21

Experiment responses with compensations (M = 61.2 Kg)

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Figure 22

Experiment responses with compensations (M = 142.8 Kg)

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Figure 23

Experiment responses with compensations (critical mass)

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