• 제목/요약/키워드: Precision Position Control

검색결과 741건 처리시간 0.034초

QFT를 이용한 냉간 압연시스템의 변위유도형 웹 위치제어 (Displacement-Type Web Position Control of Cold Mills Using QFT)

  • 정재효;김종식;박전수
    • 한국정밀공학회지
    • /
    • 제18권9호
    • /
    • pp.147-155
    • /
    • 2001
  • A new displacement type web position control system for cold mills using QFT is presented. The control system features an inner-outer cascaded system in which the inner loop provides the position tracking control of the hydraulic system and the outer loop provides the position regulation control of the web. By the sensitivity analysis and computer simulation, it is verified that the proposed control system has better robust stability and performance than the conventional control system.

  • PDF

전기 유압식 서어보 인덱싱 시스템의 위치 제어에 관한 연구

  • 안경관;진성무;이정오
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 1992년도 춘계학술대회 논문집
    • /
    • pp.385-389
    • /
    • 1992
  • The position control of the electro-hydraulic servo indexing system in a flexible forging machine was investigated. The role of an Electro-hydraulic servoindexing system is to rotate a workpiect fast and accurately to a desired position. Since the inertia of a workpiece changes during each forging step, an adapt control scheme could be adopted to the position control of the workpiece. A generalized predictive control method which depends on predicting the plant output over several steps ahead based on the assumption about future control actions is proposed. The perormance of the proposed GPC algorithm is investigated experimentally and compared with that of PID control. Experimental results show that the proposed GPC algorithm is satisfactory for the position control of the workpiece of an electrohydraulic indexing system.

형상기억합금 작동기를 이용한 스마트 구조물의 진동 및 위치 추적제어 (Vibration and Position Tracking Control of a Smart Structure Using SMA Actuators)

  • 박노준;최승복;정재천
    • 한국정밀공학회지
    • /
    • 제13권8호
    • /
    • pp.155-163
    • /
    • 1996
  • This paper presents vibration and position tracking control of a smart structure using shape memory alloy(SMA) actuators. A governing equation of motion of the proposed structure is obtained via Hamilton's princeple. The dynamic characteristics of the SMA actuator are experimentally identified and incorporated with the governing equation to furnish a control system model. Subsequently, a sliding mode controller which has inherent robustness to external disturbances is formulated on the basis of the sliding mode conplacement, and also for the position tracking control of desired trajectories with low-frequency sine and square waves.

  • PDF

역 히스테리시스 모델링과 오차학습을 이용한 압전구동기의 초정밀 위치제어 (Precision Position Control System of Piezoelectric Actuator Using Inverse Hysteresis Modeling and Error Learning Method)

  • 김형석;이수희;정해철;이병룡;안경관
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2004년도 추계학술대회 논문집
    • /
    • pp.383-388
    • /
    • 2004
  • A piezoelectric actuator yields hysteresis effect due to its composed ferroelectric. Hysteresis nonlinearty is neglected when a piezoelectric actuator moves with short stroke. However when it moves with long stroke and high frequency, the hysteresis nonlinearty can not be neglected. The hysteresis nonlinearty of piezoelectric actuator degrades the control performance in precision position control. In this paper, in order to improve the control performance of piezoelectric actuator, an inverse modeling scheme is proposed to compensate the hysteresis nonlinearty problem. And feedforward - feedback controller is proposed to give a good tracking performance. The Feedforward controller is inverse hysteresis model, Nueral network and PID control is used as a feedback controller. To show the feasibility of the proposed controller and hysteresis modeling, some experiments have been carried out. It is concluded that the proposed control scheme gives good tracking performance

  • PDF

역 히스테리시스 모델을 이용한 압전 구동기의 정밀위치 제어 (Precision Position Control of Piezoactuator Using Inverse Hysteresis Model)

  • 김정용;이병룡;양순용;안경관
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 1997년도 추계학술대회 논문집
    • /
    • pp.349-352
    • /
    • 1997
  • A Piezoelectric actuator yields hysteresis effect due to its composed ferroelectric. Hysteresis nonlinearity is neglected when a piezoelectric actuator moves with short stroke. However when it moves with long stroke and high frequency, the hysteresis nonlinearity can not be neglected. The hysteresis nonlinearity of piezoelectric actuator degrades the control performance in precision position control. In this paper, in order to improve the control performance of piezoelectric actuator, an inverse modeling scheme is proposed to compensate the hysteresis nonlinearity problem. And feedforward-feedforward-feedback controller is proposed to give a good tracking performance. The Feedforward controller is inverse hysteresis model, and PID control is sued as a feedback controller. To show the feasibility of the proposed controller and hysteresis modeling, some experiments have been carried out. It is concluded hat the proposed control scheme gives good tracking performance.

  • PDF

제한조건물 고려한 조미동 위치제어 시스템의 최적제어 (Optimal Control of a Coarse/Fine Position Control System with Constraints)

  • 주완규;최기상;최기흥
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 2000년도 제15차 학술회의논문집
    • /
    • pp.344-344
    • /
    • 2000
  • Recently, the demand for high precision and large stroke in linear positioning systems is increasing in industry. A coarse-fine position control system composed of a linear motor and a piezoelectric actuator has such characteristics. Many optimal control laws have been applied to the position control of coarse-fine actuators but most of them did not take account into constraints. In this study, model predictive control (MPC) method with constraints is applied to the position control of the coarse-fine actuator and the performance of MPC is compared with those of conventional control laws.

  • PDF

Position Control of a 3 dof Closed -loop Cylinder System Using ER Valve Actuators

  • Park, Seug-Bok;Cho, Myung-Soo
    • International Journal of Precision Engineering and Manufacturing
    • /
    • 제2권2호
    • /
    • pp.48-56
    • /
    • 2001
  • This paper presents the position tracking control of a closed-loop cylinder system using electro-rheological (ER) valve actuators. After manufacturing three sets of cylindrical ER valves on the basis of Bingham model of ER fluid, a 3 dof(degree-freedom) closed-loop cylinder system having the heave, roll and pitch motions is constructed. The governing equations of motion are derived using Lagrange's equation and a control model is formulated by considering nonlinear characteristics of the system, Sliding mode controllers are the designed for these ER valve actuators in order to achieve position tracking control. The effectiveness of trajectory tracking control performance of the proposed cylinder system is demonstrated through computer simulation and experimental implementation of the sliding mode controller.

  • PDF

ER 브레이크와 클러치를 이용한 이송 테이블의 위치 제어 (Position Control of a Moving Table Using ER Brake and ER Clutch)

  • 김승래;최승복;정재천
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 1996년도 추계학술대회 논문집
    • /
    • pp.225-229
    • /
    • 1996
  • This paper presents an active position control of a moving table utilizing ER(electro-rheological) brake and ER clutch. A transformer oil-based ER fluid is composed and its Bingham properties are evaluated with respect to electric fields. The dynamics of the actuators : ER brake and ER clutch, are identified through experiments, and subsequently the governing equation of motion of the moving table system is formulated from the governing equation, a sliding mode controller is designed to achieve an accurate position control. Both simulation and experimental results and presented in order to demonstrate the effectiveness of the proposed control methodology.

  • PDF

반도체 제조 장비용 영구자석형 동기전동기의 고분해능 위치제어에 관한 연구 (A study on High-Precision Position Control of Permanent Magnet Synchronous Motor for Semiconductor Equipments)

  • 홍선기;황인성
    • 한국산학기술학회논문지
    • /
    • 제6권5호
    • /
    • pp.432-438
    • /
    • 2005
  • 본 논문에서는 반도체 제조를 위한 AC 서보 모터의 고정도 위치 제어에 관하여 연구하였다. 제어기는 150 MIPS의 고속 처리가 가능한 Tl사의 차세대 모터 제어용 DSP TMS320F2812를 이용하여 컨트롤러를 구성하였으며, 2,500 PPR 분해능의 광학식 증분형 엔코더가 장착 된 100W 용량의 PMSM을 위치 제어 하였다. 위치 제어기를 구성하기 위하여 속도 제어기와 전류 제어기를 하위 루프로 구성하였으며, 회전형 엔코더 4체배 된 신호를 이용하여 최대 10,000 PPR의 위치 제어를 수행 하였다. 이로부터 보다 많은 PPR을 지원하는 엔코더에서도 같은 방법으로 고정도 위치제어가 가능할 것이다.

  • PDF

정현파 엔코더를 이용한 서보전동기의 초정밀 위치제어에 관한 연구 (Study on Ultra Precise Position Control of Servomotor using Analog Quadrature Encoder)

  • 김주찬;김장목;김철우;최철
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2005년도 춘계학술대회 논문집
    • /
    • pp.260-264
    • /
    • 2005
  • This paper describes the ultra precise position control of servo motor using sinusoidal encoder based on 'Arcsine Interpolation Method'. First, the paper theoretically analyzes and verify throughout experiments, the relationship between A/D converter input ripple and the total resolution to measure the precise position. Second, this paper presents a way to compensate the total gain and offset error by utilizing a low cost programmable differential amp, by which without any special expensive equipments they are easily on-line tuned and effectively compensated. Lastly, it was compared to servomotor position control characteristics using digital incremental 50,000ppr encoder. The test results show that, with much cheaper sinusoidal encoder, the proposed method exhibits better performance both in position control and ASD applications than the 50,000ppr optical encoder.

  • PDF