• Title/Summary/Keyword: hydraulic servo motor control system

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Constant Speed Control of Shaft Generating System Driven by Hydrostatic Transmission Using a PWM Controlled High Speed on/off Valve for Ship Use (고속 전자밸브 PWM제어에 의한 유압구동식 선박용 축발전장치의 정속제어)

  • 정용길;신민수;이일영
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.6
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    • pp.1374-1381
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    • 1994
  • This study suggests a new type shaft generating system driven by hydrostatic transmission suitable for small size vessels. In this system, the hydraulic motor speed is controlled by displacement adjustment using a 3-way high speed on/off valve. The 3-way high speed valve is operated by PWM control signal. In this study, a digital robust servo control algorithm is applied to the controller design of the system. By experiments and numerical computations, the frequency variation characteristics of the generating system under various disturbances are investigated. Conclusively, it is said that the shaft generating system proposed in this study shows excellent control performances.

Design of Dual Fuzzy Logic Controller using $e-{\Delta}e$ Phase Plane for Hydraulic Servo Motor (유압 서보 모터를 위한 $e-{\Delta}e$ 위상평면을 이용한 이중 퍼지 로직 제어기 설계)

  • Shin, Wee-Jae;Moon, Jeong-Hoon
    • Journal of the Institute of Convergence Signal Processing
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    • v.8 no.3
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    • pp.222-226
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    • 2007
  • In this paper we composed the dual fuzzy rules using each region of specific points and $e-{\Delta}e$ phase plane In order to make dual fuzzy rule base. We composed the fuzzy control rules which can decrease rise time, delay time, maximum overshoot than basic fuzzy control rules. proposed method is alternately use at specific points of $e-{\Delta}e$ phase plane with two fuzzy control rules that is one control rule occruing the steady state error in transient region and another fuzzy control rule use to decrease the steady state error and rapidly converge at the convergence region. Also, two fuzzy control rules in the $e-{\Delta}e$ phase plane decide the change time according to response characteristics of plants. In order to confirm thef proposed algorithm. As the results of experiments through the hydraulic servo motor control system with a DSP processor, We verified that proposed dual fuzzy control rules get the good response compare with the basic fuzzy control rule.

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The Study of the Design of a Hydraulic Torque Load Simulator Equipped with a Direct Drive Servo Valve and a Feed forward Compensator (직접 구동형 서보밸브와 전진 보상기를 적용한 유압식 토크 부하 시뮬레이터의 설계에 관한 연구)

  • Lee, Seong Rae
    • Journal of Drive and Control
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    • v.15 no.1
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    • pp.16-27
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    • 2018
  • Hydraulic torque load simulator is essential to test and qualify the performance of various angle control systems. Typically a flapper-type second stage servovalve is applied to the load simulator, but here the direct drive servovalve, which is a kind of one-stage valve and affected by the large flow force, is applied. Since the torque load is applied not to the stationary shaft but to the rotating shaft of the angle control system, the controlled torque of load simulator is not accurate due to the rotating speed of the angle control system. A feedforward compensator is designed and applied to minimize the disturbance-like effect. A mathematical model is derived and linearized to analyze the stability, accuracy and responsiveness of the torque load simulator. The parameter effects of a controller, servovalve, hydraulic motor, rotating spring shaft are analyzed and summarized. The goodness of the linear analysis is verified by the digital computer simulations using both the linear and nonlinear mathematical models.

Velocity Control of an Electro-hydraulic Servo System with Integral Variable Structure Controller (적분 가변구조제어기를 갖는 전기유압 서보시스템의 속도제어)

  • Huh, J.Y.
    • Journal of Drive and Control
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    • v.18 no.4
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    • pp.52-58
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    • 2021
  • The variable structure controller is designed such that in sliding mode, the system moves along the switching plane in the vicinity of the switching plane, thus it is robust because it is not affected by the parameter fluctuations of the plant. However, a controller based on a variable structure may not meet the desired performance when it is commanded to track any input or is exposed to disturbances. This study proposes a sliding mode controller that follows the IVSC (Integral Variable Structure Control) approach with ELO (Extended Luenberger observer) to solve this problem. The proposed sliding mode control is applied to the velocity control of the hydraulic motor. The sliding plane was determined by the pole placement, and the control input was designed to ensure the existence of the sliding mode. The feasibility of modeling and controller are reviewed by comparing with conventional proportional-integral control through computer simulation using MATLAB software and experimenting on the cases of significant plant parameter fluctuations and disturbances.

Design and Implementation of Fuzzy PID Controller (Fuzzy PID 제어기 설계 및 구현)

  • Shin Wee-Jae
    • Journal of the Institute of Convergence Signal Processing
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    • v.6 no.2
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    • pp.89-94
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    • 2005
  • In this paper, we propose a fuzzy PID controller of new method. There are two problems in absolute digital PID controller. First, much calculation time need for obtain the sum of data at each period. Second, this is problem need much memory because to storage every data at the before period. We use the speed type PID digital controller to improvement such problems. In the propose controller doesn't use without adjustment the crisp output error and we doesn't use nile tables in the fuzzy inference process at the forward stage fuzzifier. We inference output member ship function by using the relation and range of two variable of PID gain parameters. We can obtained desired results through the simulation and a experiment of the hydraulic servo motor control system.

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Position Control of an Electro Hydraulic Actuator Using Adaptive Control Method (적응제어 기법을 이용한 전기-유압 액츄에이터의 위치제어)

  • Cho, S.H.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.7 no.3
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    • pp.1-6
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    • 2010
  • This paper deals with the issue of simple adaptive position control for a pump-controlled cylinder system. A fixed displacement pump is utilized instead of servo valve and its speed is controlled by AC motor. The whole control system is composed of a pair of interconnected subsystems, that is, a feedback control system and a feedforward control system. From experiments it is shown that position control using simple adaptive control can accomplish significant reduction in position tracking error comparing to a conventional PID control.

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Current Equation Loop Design of Muti-channel Direct Drive Valve Actuation (다중채널 직접구동 엑츄에이터의 구동전류 동일화 루프 설계)

  • Nam, Yoonsu
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.10
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    • pp.162-169
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    • 2000
  • A Direct Drive Valve(DDV) hydraulic actuation system which is commonly used as an aircraft's control surface driving actuator has multi-loop control structure to ensure its safety operation. However, because of not perfect matching of one self channel characteristics with the others, the servo valve driving current of each channel can be widely different. Therefore, the long-time use of DDV actuator without any correction of these channel current offsets will cause the problem of performance or life expectancy degradation due to unwanted heats in the linear motor. A current equalization loop structure which can minimizes current offsets between channels is introduced and designed. The performance of the current equalization loop is investigated and verified through the analytic and experimental ways.

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An adaptive control algorithm for the speed control of hydraulic-servo system (유압 서보 시스템의 속도 제어를 위한 적응제어기의 설계에 관한 연구)

  • Yun, Ji-Seop;Jo, Hyeong-Seok
    • Journal of the Korean Society for Precision Engineering
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    • v.3 no.1
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    • pp.29-39
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    • 1986
  • An adaptive controller which is robust to the unknown load disturbance is developed for electro-hydraulic speed control systems. Since the load disturbance degrades the performance of the controller such as a steady state error and rise time in the conventional control system, appropriate adjustment of the controller is necessary in order to obtain the desired performances. The adaptation mechanism was designed to tune the feedforward gain, based upon minimization of ITAE (integral of time-multiplied absolute error) performance. The unknown load distrubance was identified by using an analog computer from the relationship between the velocity of the hydraulic motor and the load pressure. To evaluate the performance of the controller a series of simulations and experiments were conducted for various load conditions. Both results show that the proposed adaptive controller shows abetter performance than the conventional controller in terms of the steady state error and rise time.

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A Study on the Use of Genetic Algorithm for Compensate a Intelligent Controller (지능제어기 보상을 위한 유전 알고리즘 이용에 관한 연구)

  • Shin, Wee-Jae;Moon, Jeong-Hoon
    • Journal of the Institute of Convergence Signal Processing
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    • v.10 no.1
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    • pp.93-99
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    • 2009
  • The fuzzy control, neural network and genetic algorithm(GA) are algorithms to make the intelligence of system more higher. In this paper, we optimized the fuzzy controller using a genetic algorithm for desire response. Also a compensated fuzzy controller has dual rules. One control rule used to decrease the overshoot and rise time occurring in transient response region and another fuzzy control rule use to decrease the steady state error and rapildy to converge at the convergence region. GA is necessary to optimal the exchange time of the two fuzzy control rule base. Fuzzy-GA controller have a process of reproduction, crossover and mutation and we experimented by hydraulic servo motor control system We could observe that compensated Fuzzy-GA controller have good control performance compare to the fuzzy control technique have two rule base table.

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Fuzzy Scheduling for the PID Gain Tuning (PID 이득 동조를 위한 퍼지 스케줄링)

  • Shin Wee-Jae
    • Journal of the Korean Institute of Intelligent Systems
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    • v.15 no.1
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    • pp.120-125
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    • 2005
  • In this paper, We propose the fuzzy controller for the gain tuning of PID controller The proposed controller doesn't use the crisp output error and rule tables though with a fuzzy inference process in forward fuzzifier, New Fuzzy PID Controller assigns relations and ranges of two variables of PID gain parameters. These new gain parameters are calculated by the fuzzy inference with max-min ranges of Kp and Kd. The Ki parameter is computed automatically between Kp and Kd parameter Is calculated by Ziegler-Nickels tuning rules. Finally we experimented the propose controller by the hydraulic servo motor control system. We can obtained desired results through the good control characteristics.