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Research Papers

A High Flow Rate and Fast Response Electrohydraulic Servo Valve Based on a New Spiral Groove Hydraulic Pilot Stage

[+] Author and Article Information
Shuai Wu

Science and Technology on Aircraft
Control Laboratory,
School of Automation Science
and Electrical Engineering,
Beihang University,
Beijing 100191, China
e-mail: wushuai.vip@gmail.com

Zongxia Jiao

Science and Technology on Aircraft
Control Laboratory,
School of Automation Science
and Electrical Engineering,
Beihang University,
Beijing 100191, China
e-mail: zxjiao@buaa.edu.cn

Liang Yan

Science and Technology on Aircraft
Control Laboratory,
School of Automation Science
and Electrical Engineering,
Beihang University,
Beijing 100191, China
e-mail: lyan1991@gmail.com

Wenhao Dong

School of Automation Science
and Electrical Engineering,
Beihang University,
Beijing 100191, China
e-mail: dongwenhao68@163.com

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received June 4, 2014; final manuscript received December 2, 2014; published online January 29, 2015. Assoc. Editor: M. Porfiri.

J. Dyn. Sys., Meas., Control 137(6), 061010 (Jun 01, 2015) (11 pages) Paper No: DS-14-1240; doi: 10.1115/1.4029356 History: Received June 04, 2014; Revised December 02, 2014; Online January 29, 2015

High flow rate electrohydraulic servo valve is widely applied in hydraulic servo systems. Typical high flow rate servo valve is three-stage nozzle flapper pilot structure which is complicated, unreliable, and highly costly. This study proposed a new two-stage structure high flow rate and quick response electrohydraulic spiral pilot servo valve (ESPV) using a novel hydraulic full bridge spiral pilot stage (FBSPS) as hydraulic amplifier. Its structure is simpler than traditional servo valve which could increase reliability. A design parameters optimization method for servo valve is proposed. It is using an optimization objective function which can balance dynamic performance, static performance, and pilot state efficiency for different design objectives. The particle swarm optimization (PSO) method was applied to get the best key design parameters of ESPV. A research prototype was developed based on the optimized parameters for fast response. The experimental results indicated that the frequency bandwidth (−3 dB amplitude attenuation and −90 deg phase lag) of the ESPV is up to 150 Hz at 20% of full range. This frequency response performance is competitive with existing servo valves, and the simpler structure can improve reliability and reduce cost. Thus, it may have great potential in hydraulic servo system with high reliability requirement, such as aircraft hydraulic servo control system.

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Figures

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Fig. 1

Virtual prototype of new spiral pilot servo valve under development

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Fig. 2

Detailed schematic diagram of FBSPS

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Fig. 3

Schematic diagram of proposed ESPV

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Fig. 4

Hydraulic principle diagram of FBSPS

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Fig. 5

Geometry schema of FBSPS

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Fig. 6

Projection of variable orifice and geometric description

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Fig. 7

Typical step response of ESPV

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Fig. 8

Pilot leakage flow rate of ESPV

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Fig. 9

Optimization flow chart

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Fig. 10

AMESim model of SPV

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Fig. 11

Optimization process of parameters: (a) r, (b) rf, (c), h0, and (d) As

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Fig. 12

Fitness value versus evolution process in four cases

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Fig. 13

Step response under optimized parameters in four cases

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Fig. 14

Pilot leakage flow rate under optimized parameters in four cases

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Fig. 15

Test rig of ESPV: (a) Test rig diagram and (b) test rig photo.

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Fig. 16

Uncontrolled dynamic characteristic experiment rig specification

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Fig. 17

Open-loop dynamic test result

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Fig. 18

Control block diagram of ESPV

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Fig. 19

Experimental results of sine sweeping

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Fig. 20

Bode plot of developed SPV

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