• Title/Summary/Keyword: Precision Position Control

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The Position Decision Experiment of Magnetic Sensor in Ball-screw Driven Linear Stage (볼나사 구동 리니어 스테이지의 마그네틱 센서 위치결정 실험)

  • Cha, Young-Youp
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.1
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    • pp.10-14
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    • 2013
  • High precision machining technology has become one of the important parts in the development of a precision machine. Such a machine requires high precision positioning as well as high speed on a large workspace. For machining systems having a high precision positioning with a long stroke, it is necessary to examine the repeatability of reference position decision. Though ball-screw driven linear stages equipped linear scale have high precision feed drivers and a long stroke, they have some limitations for reference position decision if they have not equipped the accurate home sensor. This study is performed to experimentally examine the repeatability for home position decision of a magnetic sensor as a home switch of ball-screw driven linear stage by using capacitance probe.

The Position Decision Comparison Experiment of Hall and Photo Sensors in the Linear Stage (홀 센서와 포토 센서를 이용하는 선형 스테이지에서 위치결정 비교 실험)

  • Cha, Young-Youp
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.2
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    • pp.157-161
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    • 2015
  • For machining systems having a high precision positioning with a long stroke, it is necessary to examine the repeatability of reference position decisions. Though ball-screw driven linear stages equipped with encoders have high precision feed drivers and a long stroke, they have some limitations for reference position decisions if they have not been equipped accurate home sensors. High precision machining technology has become one of the most important aspects of the development of a precision machine. Such a machine requires high precision positioning as well as high speed on a large workspace. This study is performed to experimentally compare the repeatability for home position decisions in the case of photo sensors and hall sensors as a home switch of the ball-screw driven linear stage.

A Position Decision Experiment in Ball-screw Driven Linear Stage using a Photomicrosensor (포토 마이크로 센서를 이용한 볼나사 구동 리니어 스테이지의 위치결정 실험)

  • Cha, Young-Youp
    • Journal of Institute of Control, Robotics and Systems
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    • v.20 no.4
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    • pp.463-467
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    • 2014
  • High precision machining technology has become one of the most important parts in the development of a precision machine. Such a machine requires high precision positioning as well as high speed on a large workspace. For machining systems having high precision positioning with a long stroke, it is necessary to examine the repeatability of the reference position decision. Though ball-screw driven linear stages equipped with linear scale have high precision feed drivers and a long stroke, they have some limitations for reference position decisions if they have not been equipped with an accurate home sensor. This study is performed to experimentally examine the repeatability for home position decision of a photo micro sensor as a home switch of a ball-screw driven linear stage by using a capacitance probe.

Position Control of Ultra-Precision Machine Tool Post using Piezoelectric Material(1) (압전 재료를 이용한 초정밀 가공기용 공구 위치 제어(1))

  • 김승한;송하성;송재욱;김의중
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.162-166
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    • 1996
  • This paper presents a position control of ultra-precision machine tool post using piezoelectric material. A stack-type piezoelectric actuator Is employed in a hinge-type tool holder. An assumed linear transfer function of the practical nonlinear plant is established through the comparison of transfer functions and step responses in the experiments and the simulations. Several types of feedforward/feedback controllers are designed via computer simulations using the assumed linear transfer function. The position tracking control experiments are undertaken to show the control efficiency of each controller.

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Correction of Position Error Using Modified Hough Transformation For Inspection System with Low Precision X- Y Robot (저정밀 X-Y 로봇을 이용한 검사 시스템의 변형된 Hough 변환을 이용한 위치오차보정)

  • 최경진;이용현;박종국
    • Journal of Institute of Control, Robotics and Systems
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    • v.9 no.10
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    • pp.774-781
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    • 2003
  • The important factors that cause position error in X-Y robot are inertial force, frictions and spring distortion in screw or coupling. We have to estimate these factors precisely to correct position errors, Which is very difficult. In this paper, we makes systems to inspect metal stencil which is used to print solder paste on pads of SMD of PCB with low precision X-Y robot and vision system. To correct position error that is caused by low precision X-Y robot, we defines position error vector that is formed with position of objects that exist in reference and camera image. We apply MHT(Modified Hough Transformation) for the aim of determining the dominant position error vector. We modify reference image using extracted dominant position error vector and obtain reference image that is the same with camera image. Effectiveness and performance of this method are verified by simulation and experiment.

A Precision Position Control of Antenna Driving System in Naval Vessel (함상 안테나 구동용 안정화장치의 정밀 위치제어)

  • Cho, Taik-Dong;Seo, Song-Ho;Nam, Ki-Jung
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.4
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    • pp.190-196
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    • 2001
  • The naval vessel must moves rolling, pitching, yawing by wave when it runs in ocean. Some narrow beam antenna needed position compensation by stabilizer or gimbal for best performance. This paper presents the precision position control for heavy weight(130kg) in roll and pitch direction. Generally it's called for gimbal. This gimbal uses P-I controller, and it's driven by linear actuator and servo motor. This gimbal gets ship's gyro signal and synchro, which have the absolute angle value. Some other similar equipments are driven by huge hydraulic power, but this gimbal is driven by small servo motor. This control loop gets the following procedure repeatedly; reading ship gyro and gimbal synchro, calculating compensated error and control output, driving motor and actuator The performance of gimbal system was satisfied.

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The Precision Position Control of the Pneumatic Rodless Cylinder Using Recurrent Neural Networks (리커런트 신경회로망을 이용한 공압 로드레스 실린더의 정밀위치제어)

  • 노철하;김영식;김상희
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.7
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    • pp.84-90
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    • 2003
  • This paper develops a control method that is composed of the proportional control algorithm and the learning algorithm based on the recurrent neural networks (RNN) for the position control of a pneumatic rodless cylinder. The proportional control algorithm is suggested for the modeled pneumatic system, which is obtained easily simplifying the system, and the RNN is suggested for the compensation of the modeling errors and uncertainties of the pneumatic system. In the proportional control, two zones are suggested in the phase plane. One is the transient zone for the smooth tracking and the other is the small movement zone for the accurate position control with eliminating the stick-slip phenomenon. The RNN is connected in parallel with the proportional control for the compensation of modeling errors and frictions, compressibilities, and parameter uncertainties in the pneumatic control system. This paper experimentally verifies the feasibility of the proposed control algorithm for such pneumatic systems.

Simultaneous precision positioning and vibration suppression of reciprocating flexible manipulators

  • Ma, Kougen;Ghasemi-Nejhad, Mehrdad N.
    • Smart Structures and Systems
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    • v.1 no.1
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    • pp.13-27
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    • 2005
  • Simultaneous precision positioning and vibration suppression of a reciprocating flexible manipulator is investigated in this paper. The flexible manipulator is driven by a multifunctional active strut with fuzzy logic controllers. The multifunctional active strut is a combination of a motor assembly and a piezoelectric stack actuator to simultaneously provide precision positioning and wide frequency bandwidth vibration suppression capabilities. First, the multifunctional active strut and the flexible manipulator are introduced, and their dynamic models are derived. A control strategy is then proposed, which includes a position controller and a vibration controller to achieve simultaneous precision positioning and vibration suppression of the flexible manipulator. Next, fuzzy logic control approach is presented to design a fuzzy logic position controller and a fuzzy logic vibration controller. Finally, experiments are conducted for the fuzzy logic controllers and the experimental results are compared with those from a PID control scheme consisting of a PID position controller and a PID vibration control. The comparison indicates that the fuzzy logic controller can easily handle the non-linearity in the strut and provide higher position accuracy and better vibration reduction with less control power consumption.