• Title/Summary/Keyword: Fluid Power Control System

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Kalman Filter Estimation of the Servo Valve Effective Orifice Area for a Auxiliary Power Unit (보조 동력장치용 서보밸브 유효 오리피스 면적의 칼만필터 추정)

  • Zhang, J.F.;Kim, C.T.;Jeong, H.S.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.4 no.4
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    • pp.1-7
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    • 2007
  • Flow rate is one of the important variables for precise motion control and detection of the faults and fluid loss in many hydraulic components and systems. But in many cases, it is not easy to measure it directly. The orifice area of a servo valve by which the fluid flows is one of key factors to monitor the flow rate. In this paper, we have constructed an estimation algorithm for the effective orifice area by using the model of a servo valve cylinder control system and Kalman filter algorithm. Without geometry information about the servo valve, it is shown that the effective orifice area can be estimated by using only displacement and pressure data corrupted with noise. And the effect of the biased sensor data and system parameter errors on the estimation results are discussed. The paper reveals that sensor calibration is important in accurate estimation and plausible parameter data such as oil bulk modulus and actuator volume are acceptable for the estimation without any error. The estimation algorithm can be used as an useful tool for detecting leakage, monitoring malfunction and/or degradation of the system performance.

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Characteristics of a Flow Control Valve for a Submerged Cargo Pumping System (서브머지드 카고 펌프 시스템용 유량제어밸브의 특성)

  • Lee, I.Y.;Choi, S.R.;Lee, D.R.;Park, H.H.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.6 no.2
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    • pp.7-13
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    • 2009
  • This study specifies the flow control characteristics of a flow control valve(FCV) in a submerged cargo pumping system through experiments and simulations. In the experiments, the functions of the major components of the FCV in relation to the FCV's flow characteristics are presented clearly. Through the simulations, it is shown that the simulation program suggested in this study can be utilized for the design of the FCV.

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Design of Multivariable 2-DOF PID for Electrical Power of Flow System by Neural Network Tuning Method (신경망 튜우닝에 의한 유량계통 동력 제어용 다변수 2-자유도 PID의 제어기 설계)

  • 김동화
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.12 no.1
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    • pp.78-84
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    • 1998
  • The fluid system such as, the quantity control of raw water, chemicals control in the purification, the waste water system as well as in the feed water or circulation system of the power plant and the ventilation system is controlled with the valve and moter pump. The system's performance and the energy saving of the fluid systems depend on control of method and delicacy. Until, PI controller use in these system but it cannot control delicately because of the coupling in the system loop. In this paper we configure a single flow system to the multi variable system and suggest the application of 2-DOF PID controller and the tuning methods by the neural network to the electrical power of the flow control system. the 2-DOF controller follows to a setpoint has a robustness against the disturbance in the results of simulation. Keywords Title, Intelligent control, Neuro control, Flow control, 2 - DOF control., 2 - DOF control.

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Development of Flow Control Valve Using MR Fluid (MR유체를 이용한 유량제어 밸브)

  • Lee, Hyung-Don;Bae, Hyung-Sub;Lee, Yuk-Hyung;Park, Myeong-Kwan
    • Journal of Institute of Control, Robotics and Systems
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    • v.17 no.9
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    • pp.888-891
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    • 2011
  • This paper presents development of flow control valve using MR fluid. Generally, since the apparent viscosity of MR fluids is adjusted by applying magnetic fields, the MR valves can control high level fluid power without any mechanical moving parts. In this paper, flow control valve using MR fluid on the behavior of the magnetic field influence on the numerical analysis of more accurate electromagnetic parameters were obtained, even if when magnetic field apply inside of surrounding MR fluid from electromagnet, more realistic designing way analysis of characteristic of whole magnetic field distribution is suggested by surrounding magnetic material. Also, comparison of flow rate inlet and outlet, behavior of MR fluid in experiments proposed. A new type of flow control valve using MR fluid is proposed by analysis of behavior of MR fluid in experiments.

Pressure Ripple Reduction in High Speed On-Off Solenoid Valves Driven by PWM Control (PWM 제어 고속 온-오프 전자밸브에서 발생하는 압력맥동 저감)

  • Kim D.T.;Lee S.K.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.2 no.2
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    • pp.8-13
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    • 2005
  • This paper investigates a fast, accurate and inexpensive hydraulic motor speed control system using high speed on-off solenoid valves. In order to retain the advantages of the two position valve and obtain better performance, the valves are operated by pulse width modulation(PWM) control. PWM signal is generated from a LabWIEW program in microcomputer in order to set up various duty ratio and frequency of carrier wave in PWM signal with varying system parameters. As the results of experiments, the speed control of a hydraulic motor was successfully implemented using on-off solenoid valves. In order to attenuate the pressure ripple and speed variation due to discontinuously controlled flow through the on-off valves, a resonator hose fabricated for automobile power steering system was connected between the valve and a hydraulic motor. From experimental results obtained in the hydraulic motor system with a resonator hose, it was ascertained that the resonator hose showed excellent performances in reducing pressure ripple and motor speed variation.

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A Study on Shape Optimization of Electro-Magnetic Proportional Solenoid (비례솔레노이드 형상 최적설계에 관한 연구)

  • Yun S.N.;Ham Y.B.;Kang J.H.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.2 no.3
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    • pp.1-5
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    • 2005
  • There are two types of solenoid actuator for force and position control of the fluid power system. One is an on-off solenoid actuator and the other is an electro-magnetic proportional actuator. They have some different characteristics for attraction force according to solenoid shape. Attraction force of the on-off solenoid actuator only depends on flux density. And the stroke-force characteristics of the proportional solenoid actuator are determined by the shape of the control cone. In this paper, steady state characteristics of the solenoid actuator for electro-hydraulic proportional valve determined by the shape of control cone are analyzed using finite element method and it is confirmed that the proportional solenoid actuator has a constant attractive force in the control region independently on the stroke position. And the shape of control cone is optimized using 1+1 evolution strategy to get a constant force. In the optimization algorithm, control cone length, thickness and taper length are used as a design parameter.

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