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TECHNICAL PAPERS

Dynamic Redesign of a Flow Control Servovalve Using a Pressure Control Pilot

[+] Author and Article Information
Perry Y. Li

Department of Mechanical Engineering, University of Minnesota, 111 Church St. SE, Minneapolis, MN 55455e-mail: pli@me.umn.edu

J. Dyn. Sys., Meas., Control 124(3), 428-434 (Jul 23, 2002) (7 pages) doi:10.1115/1.1485288 History: Received February 01, 2001; Online July 23, 2002
Copyright © 2002 by ASME
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References

Figures

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A two-spool flow control servovalve using a pressure control pilot state.
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Differential pressure response to a 20 mA step input current: full nonlinear model and simplified linearized model. Also shown is a first order simplified model to be discussed in Section III-B.
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Block diagram for root locus analysis with the upper feedback loop as the inner loop. The actual valve dynamics are obtained when K1=K2=1.
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Root locus diagram of the pilot/chamber differential pressure subsystem as K1 increases from 0→∞ in Fig. 3
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Root locus diagram of the spool subsystem and the pilot/chamber differential pressure subsystem as K2 increases from 0→∞ and K1=1 in Fig. 3
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Partial root locus diagram of outer loop with inner loop being the spool/chamber system with K2=1 as K1 increases from 0→∞. Two other poles on the far left are not included.
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Block diagram with the pilot and the spool subsystems approximated by their static systems
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Step response of the valve modified by changing Ao to 1.5Ao
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Step response of the valve modified by K̄p←0.75K̄p(Kp←0.54Kp). Note that 64% rise time has been reduced from 8.2 ms to 4.9 ms.
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Step response (top) and current-flow relationship (bottom) of the valve modified by As←As/2,Ks←Ks/2
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Consequences on the static criteria when various design parameters are used to improve the dynamic performance. Direction of the arrow indicates the direction of proposed change. “X” represents significant degradation, “√” represents some improvement. For each column, the variables in all other columns are assumed to be constant.
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Root locus of the reduced order model in Fig. 7

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