Research on the Position-Pressure Master-Slave Control for a Rolling Shear Hydraulic Servo System

Wang, Jun; Sun, Yu; Huang, Xue Qing; Li, Zhou Hong; Han, Yong

doi:10.5545/sv-jme.2014.2291

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…13. Test bench schematic: (1) pump, (2), (10) relief valve, (3) differential valve, (4), (9) throttle valve, (5) hydraulic actuator, (6), (8), (11) check valve, (7) control valve, (12) LVDT transducer, (13) pressure transducers, (14) flow meter, (15) DAQ card and PC…”

Section: Test Bench Experimentsmentioning

confidence: 99%

“…Experimental results showed high energy efficiency and excellent control performance of the automatic switching system between the first idle speed, the second idle speed, and the normal operating speed of a hydraulic cylinder. Pérez et al [2] presented a robust controller for the hydraulic actuator force control, while Wang et al [3] proposed a novel position-pressure master-slave controller for the hydraulic servo system. Moreover, Wang and Wang [4] developed an energy-saving control strategy with a load-sensing structure including a load-sensing pump, a proportional relief valve, a throttle valve, and an adaptive control algorithm.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Experimental Study of a Novel Valve Using the Return Stream Energy to Adjust the Speed of a Hydraulic Actuator

Filo¹,

Lisowski²,

Kwiatkowski³

et al. 2019

SV-JME

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This article discusses the possibility of increasing the speed of movement of a single-sided hydraulic cylinder piston rod using a fluid stream from the return line. Directing the return stream back to the supply line instead of the fluid reservoir causes significant increase in the inflow rate to the actuator. This situation may arise when the piston rod of the cylinder is not fully loaded on part of the movement range. As part of this work, we proposed a solution in the form of a novel control valve, consisting of a throttle valve and a differential valve controlled by the pressure difference between the supply line and the return line. A geometric model was created using SolidWorks, then a simulation model was made in Matlab/Simulink. Next, simulations were carried out to prove that the use of the return fluid stream gives a possibility of a significant increase in the piston rod speed. The results of the numerical analyses were verified on a test bench where the valve prototype was tested. Speed characteristics of the piston rod against both payload force and throttle valve setting were determined. High convergence with the simulation results was obtained. It has also been confirmed that the proposed solution can be advantageous in practical applications.

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Section: Test Bench Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study of a Novel Valve Using the Return Stream Energy to Adjust the Speed of a Hydraulic Actuator

Filo¹,

Lisowski²,

Kwiatkowski³

et al. 2019

SV-JME

View full text Add to dashboard Cite

show abstract

Nonlinear stability research on the hydraulic system of double-side rolling shear

Wang

Huang

et al. 2015

Review of Scientific Instruments

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This paper researches the stability of the nonlinear system taking the hydraulic system of double-side rolling shear as an example. The hydraulic system of double-side rolling shear uses unsymmetrical electro-hydraulic proportional servo valve to control the cylinder with single piston rod, which can make best use of the space and reduce reversing shock. It is a typical nonlinear structure. The nonlinear state-space equations of the unsymmetrical valve controlling cylinder system are built first, and the second Lyapunov method is used to evaluate its stability. Second, the software AMEsim is applied to simulate the nonlinear system, and the results indicate that the system is stable. At last, the experimental results show that the system unsymmetrical valve controlling the cylinder with single piston rod is stable and conforms to what is deduced by theoretical analysis and simulation. The construction and application of Lyapunov function not only provide the theoretical basis for using of unsymmetrical valve controlling cylinder with single piston rod but also develop a new thought for nonlinear stability evaluation.

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Amplitude-frequency characteristics analysis for vertical vibration of hydraulic AGC system under nonlinear action

et al. 2019

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Hydraulic automatic gauge control (AGC) system is the core control system to ensure the thickness accuracy of cold-rolled plate, and the reliability of its load roll system is the key to guarantee the rolling process with high precision, high speed, continuity and stability. However, the working mechanism of hydraulic AGC system is complex. And it possesses some features such as high nonlinearity, time variability and strong coupling. The vertical vibration easily happens in its working process. Moreover, the stability of system is seriously affected. Nevertheless, the incentive is difficult to determine. In this paper, the theory and method of nonlinear dynamics were introduced to establish the load vertical vibration (LVV) model of HAGC system under nonlinear action. The model was solved with multi-scale method, and the amplitude-frequency characteristic equation of system was obtained. Moreover, the research object of this article also focused on the nonlinear elastic force, nonlinear damping force and nonlinear excitation force, and deeply explored the effect of nonlinear parameters change on the amplitude-frequency characteristics of LVV system. The mechanism and incentive for LVV of hydraulic AGC system were further revealed. The research results lay a theoretical foundation for the vibration inducement and suppression of hydraulic AGC system.

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Research on the Position-Pressure Master-Slave Control for a Rolling Shear Hydraulic Servo System

Cited by 5 publications

References 13 publications

Numerical and Experimental Study of a Novel Valve Using the Return Stream Energy to Adjust the Speed of a Hydraulic Actuator

Numerical and Experimental Study of a Novel Valve Using the Return Stream Energy to Adjust the Speed of a Hydraulic Actuator

Nonlinear stability research on the hydraulic system of double-side rolling shear

Amplitude-frequency characteristics analysis for vertical vibration of hydraulic AGC system under nonlinear action

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