• Title/Summary/Keyword: Torque Disturbance

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Fault Isolation for a Diesel Engine Actuator (디젤엔진 위치서보시스템을 위한 고장 식별)

  • Park, Tae-Geon;Hur, Hak-Bom;Lee, Kee-Sang
    • Proceedings of the KIEE Conference
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    • 1998.07b
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    • pp.417-419
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    • 1998
  • In a large diesel engine actuator position servo system, it is impossible to isolate an actuator fault from a load torque with conventional fault detection isolation (FDI) schemes because they are propagated through a channel. This paper deals with a parity equation based residual generation to isolate them in the system. The actuator fault is modelled by a multiplicative type fault that can be characterized as discrepancies between the nominal and actual plant parameters, whereas the load torque is modelled by an additive disturbance. The transformation implemented in the residual generator should be determined on-line to achieve the isolation. Simulation studies show the practical applicability of the FDI scheme.

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An Acceleration Control Type of DC Servo-motor for Stiffness Improving (견실성 향상을 위한 직류서어보모터의 가속도제어)

  • 장기효;홍창희
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.15 no.3
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    • pp.213-220
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    • 1990
  • DC servo motor has been often used as the position control system, because the performance is excellent on the velocity and position control system. When the unknow disturbance and accessible load torque are imposed on the position control of DC servo motor, this system has the steady and/or transient state error. In this paper, a new method which has high stiffness for reducing the error is proposed. This error will be reduced by acceleration control. The effectiveness of the acceleration control is confirmed by using computer simulation.

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A Nonlinear Speed Control for a Permanent Magnet Synchronous Motor Using a Simple Disturbance Estimation Technique (외란 관측기를 이용한 영구자석 동기전동기의 비선형 속도 제어)

  • 이나영;김경화;윤명중
    • The Transactions of the Korean Institute of Power Electronics
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    • v.6 no.2
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    • pp.149-157
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    • 2001
  • A nonlinear speed control for a permanent magnet synchronous motor (PMSM) using a simple disturbance estimation technique is presented. By using a feedback linearization scheme, the nonlinear motor model can be linearized in a controllable canonical form, and the desired speed dynamics can be obtained based on the linearized model. This technique, however, gives an undesirable output performance under the mismatch of the system parameters and load conditions. To cancel disturbance by parameter variation, the controller parameters will be estimated by using a disturbance observer theory where the disturbance torque and flux linkage are estimated. since only the two reduced order observers are used for the parameter estimations, the observer designs are considerably simple and the additional load for computation of the controller is negligibly small. The proposed control scheme is implemented on a PMSM using DSP TMS320C31 and the effectiveness is verified through the comparative simulations and experiments.

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MR rotary brake development with permanent magnet (자기 유변 유체와 영구 자석을 이용한 회전 엑츄에이터의 개발)

  • 권순우;박영진
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.183-186
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    • 1997
  • This paper presents the new MR rotary brake with a permanent magnet, based on the shear operating mode. Due to the permanent magnet, the MR rotary brake can give the nominal resistance to the external disturbance and give the fail safe capacity to the system even when the power supply is accidentally cut off. As we apply the positive or negative current to the electric magnet coil, the resistance torque of the MR rotary brake can be reduced to the value less than the nominal resistance or increased up to the magnetic saturation point.

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Design of actuator for underwater vehicle using fuzzy logic control (퍼지제어를 이용한 수중운동체의 구동장치설계)

  • 조현진;양승윤;최중락;이동권
    • 제어로봇시스템학회:학술대회논문집
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    • 1991.10a
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    • pp.616-619
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    • 1991
  • This paper describes the design of fuzzy logic controller for underwater vehicle actuator with high hydroload torque disturbance. For real-time processing of the fuzzy rule, the look-up tables including coarse mode and fine mode are used instead of inference engine process. Computer simulations are done in order to analyze the performance of the proposed algorithm and the very useful results are shown to us by comparing with the existing controller.

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Robust adaptive controller design for robot manipulator (로보트 매니퓰레이터에 대한 강건한 적응제어기 설계)

  • 안수관;배준경;박종국;박세승
    • 제어로봇시스템학회:학술대회논문집
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    • 1989.10a
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    • pp.177-182
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    • 1989
  • In this paper a new adaptive control algorithm is derived, with the unknown manipulator and payload parameters being estimated online. In practice, we may simplify the algorithm by not explicity estimating all unknown parameters. Further, the controller must be robust to residual time-varying disturbance, such as striction or torque ripple. Also, the reference model is a simple douple integrator and the acceleration input for robot manipulator consists of a proportion and derivative controller for trajectory tracking purposes. The validity of this control is confirmed in simulation where two-link robot manipulator shows the robust performances in spite of the existing nonlinear interaction and unknown parametrictings

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The simulation of INS error due to gimbal servo dynamics (김블 서어보 다이나믹스에 의한 INS 오차 시뮬레이션)

  • 김현백;정태호;오문수
    • 제어로봇시스템학회:학술대회논문집
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    • 1986.10a
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    • pp.281-285
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    • 1986
  • In this paper, the characteristics of disturbance torque of gimbal servo dynamics are studied, and the simulation methods of gimbal servo dynamics and INS error due to angular rate and linear acceleration of vehicle are proposed. In results of the simulation for a specific INS, it is estimated that INS velocity error due to gimbal servo dynamics is nearly proportional to square of vehicle acceleration.

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SPEED CONTROL FOR ULTRASONIC MOTORS USING FUZZY ON-LINE TUNING SYSTEM

  • Senjyu, Tomonobu;Gushiken, Yoshiniko;Uezato, Katsumi
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.125-130
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    • 1998
  • This paper presents a speed control for ultrasonic motors using a PI controller and disturbance torque observer. Since the PI gains and the observer's poles are generally fixed, the control performance deteriorates when the driving conditions vary much. Therefore, we propose the speed control scheme that the PI gains and the observer's poles are adjusted on-line in accordance with the speed ripple using fuzzy reasoning.

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Angle Control for SRCI Fed Induction Motor Drive (SRCI 구동 유도전동기 시스템의 Angle Control)

  • 김인동;조규형
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.37 no.12
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    • pp.854-861
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    • 1988
  • The current source inverter-fed induction motor(CSIM) drive is widely used in industry because of its four quadrant operation, fuseless protection, fuseless protection, and ruggedness. the CSIM drive system, however, has shortcomins such as slow response and dynamic stability to load torque disturbance and reference speed change. Such a disadvantages can be compensated considerably by means of introducing additional angle angle control loop. The angle control method is dependent upon the inverter type. In this paper, simultaneus recovery and commutation inverter(SRCI) which is developed recently is considered.

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Speed Control of an Induction Motor using Acceleration Feedforward Compensation (가속도 전향보상을 이용한 유도전동기의 속도제어)

  • Kim, Sang-Hoon;Lee, Jae-Wang
    • Journal of Industrial Technology
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    • v.20 no.B
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    • pp.175-182
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    • 2000
  • In this paper, a novel speed control strategy using an acceleration feedforward compensation by the estimation of the system inertia is proposed. With the proposed method, the enhanced speed control performance can be achieved and the speed response against the disturbance torque can be improved for the vector-controller induction motor drive systems in which the bandwidth of the speed controller cannot be made large enough. The experimental results confirm the validity of the proposed strategy.

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