• 제목/요약/키워드: Positioning motion

검색결과 352건 처리시간 0.033초

A Novel Picometer Positioning System for Machine Tools and Measuring Machines

  • Mizumoto, Hiroshi;Yabuta, Yoshito;Arii, Shiroh;Tazoe, Yoichi;Kami, Yoshihiro
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2005년도 ICCAS
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    • pp.123-128
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    • 2005
  • A novel tri-mode ultraprecision positioning system for machine tools and measuring machine is proposed. The basic coarse mode uses a Twist-roller Friction Drive (abbr. TFD), and controls several tens of millimeters of the machine-table travel with nanometer order of positioning resolution. The fine mode also utilizes the TFD with a fine adjusting mechanism. The resolution of the fine mode is in the range of sub-nanometer. For realizing picometer positioning, the ultra-fine mode is executed by using an active aerostatic guideway. On the bearing surface of this active guideway, several Active Inherent Restrictors (abbr. AIRs) are embedded for controlling the table position. An AIR unit consists of a piezoelectric actuator having a through hole, one end of the hole on the bearing surface acts as an inherent restrictor. Owing to the aerostatic mechanism of the AIR, the deformation of the piezoelectric actuator in the AIR unit causes much reduced table displacement. Such motion reduction is effective for ultraprecision positioning. Current positioning resolution of the ultra-fine mode is 50pm, however the final goal of the positioning resolution is expected to be in the order of picometer.

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Implementation of an Electrode Positioning System to Improve the Accuracy and Reliability of the Secondary Battery Stacking Process (2차 전지 적층 공정의 정확성과 신뢰성 향상을 위한 전극 위치결정 시스템 구현)

  • Lee, June-Hwan
    • Journal of Convergence for Information Technology
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    • 제11권6호
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    • pp.219-225
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    • 2021
  • As for the battery package method, a prismatic package method is preferred for stability reasons, but it is rapidly expanding due to the stability verification of a pouch type package. The pouch type using the lamination process has an advantage of high battery energy density because it can reduce space waste, but has a disadvantage of low productivity. Therefore, in this paper, by extracting edge detection algorithm precision, pattern algorithm precision, and motion controller recall rate by improving backlight lighting fixtures to minimize light diffusion, securing standards for stereo camera position relationship displacement monitoring, and securing standards for lens release monitoring. We propose to implement a system that ensures accuracy and reliability in positioning. As a result of the experiment, the proposed system shows an average error range of 0.032mm for edge detection, 0.02mm for pattern algorithm, and 0.014mm for motion controller, thus ensuring the accuracy and reliability of the positioning mechanism.

Development of Motion Recognition and Real-time Positioning Technology for Radiotherapy Patients Using Depth Camera and YOLOAddSeg Algorithm (뎁스카메라와 YOLOAddSeg 알고리즘을 이용한 방사선치료환자 미세동작인식 및 실시간 위치보정기술 개발)

  • Ki Yong Park;Gyu Ha Ryu
    • Journal of Biomedical Engineering Research
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    • 제44권2호
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    • pp.125-138
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    • 2023
  • The development of AI systems for radiation therapy is important to improve the accuracy, effectiveness, and safety of cancer treatment. The current system has the disadvantage of monitoring patients using CCTV, which can cause errors and mistakes in the treatment process, which can lead to misalignment of radiation. Developed the PMRP system, an AI automation system that uses depth cameras to measure patient's fine movements, segment patient's body into parts, align Z values of depth cameras with Z values, and transmit measured feedback to positioning devices in real time, monitoring errors and treatments. The need for such a system began because the CCTV visual monitoring system could not detect fine movements, Z-direction movements, and body part movements, hindering improvement of radiation therapy performance and increasing the risk of side effects in normal tissues. This study could provide the development of a field of radiotherapy that lags in many parts of the world, along with the economic and social importance of developing an independent platform for radiotherapy devices. This study verified its effectiveness and efficiency with data through phantom experiments, and future studies aim to help improve treatment performance by improving the posture correction mechanism and correcting left and right up and down movements in real time.

Micropositioning of a Linear Motion Table with Magnetic Bearing Suspension (자기 베어링으로 지지 되는 직선운동 테이블의 초정밀 위치제어에 관한 연구)

  • 김의석;안형준;장인배;한동철
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 한국정밀공학회 1995년도 추계학술대회 논문집
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    • pp.466-469
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    • 1995
  • This paper presents a design and performance of the 6 D.O.F linear motion table with a magnetic bearing suspension. The linear positioning of the table with a 150mm stroke is driven by a brushless DC Linear motor and the other attitudes of the stage are controlled by the analog PD controller with magnetic bearing actuators. Each magnetic bearing unit which consists of 3 electromagnets, 3 capacitance probes and 3 backup bearings affords controlled forces by detecting the air gap between the probes and guideways. An integral type capacitance probe amplifier is equipped on the upper plate of the table so that the probe line to the probe amplifier can be shorter therefore the problems due to the stray capacitance and noise can be reduced. Form the pitch-yaw errormeasured by the autocollimator, the vertical and horizont straightness errors of the table are derived that they are maintained below 1.mu. m over 100mm stroke. The positioning accuracy of the linear motion is maintained below 2 .mu. m and the repeatability error is below 1 .mu. m

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Optimal Control of Dynamic Positioned Vessel Using Kalman Filtering Techniques (칼만필터를 이용한 부유체운동의 최적제어)

  • Lee, Pan-Muk;Lee, Sang-Mu;Hong, Sa-Yeong
    • Journal of Ocean Engineering and Technology
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    • 제2권2호
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    • pp.37-45
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    • 1988
  • A dynamically positioned vessel must be capable of maintaining a specified position and direction by controlling the thruster devices. The motions of a vessel are often assuned to tne sum of low frequency(LF)motions and high frequency(HF)motions. The former is mainly due to wind, current and second order wave forces, while the latter is mainly due to first order wave forces. In order to avoid the high frequency thruser modulation, the control system must include filters to estimate the low frequency motions from the measured motion signals, This paper presents a control system based on Kalman filtering technique and optimal control tyeory. Using the combined kalmam filter, LF motion estimates and HF ones are achieved from the motion measurement of the vessel. The estimated low frequency motions are used as inputs to the dynamic positioning system. The thruster modulation is minimized using the optimal control theory; Linear Quadratic Gaussian(LQG)controller. The performances of the Kalman filter and the dynamic positioned vessel are investigated by computer simulation.

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A Study on Trajectory Characteristics of the Six-Degrees-of-Freedom Fine Motion Mechanism for the Ultra Precision Positioning Decision (초정밀 위치결정을 위한 6자유도미동기구의 궤적 특성에 관한 연구)

  • 김재열;윤성운
    • Transactions of the Korean Society of Automotive Engineers
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    • 제2권3호
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    • pp.33-39
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    • 1994
  • The purpose of this research is to examine precise linear motion and rotary motion. A six-degrees-of-freedom fine motion mechanism is introduced to drive an object precisely in directions of X, Y and Z-axes and around them : three rectangular linear motion and rotary ones. An experimental mechanism is introduced in which a $70$\times$70$\times$70$\times$(${mm}^3$) cube object is driven by six PZT actuator. The study is to establish the six-degrees-of-freedom fine motion mechanism of linear motion and rotary motion using PZT actuator.

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3-Axis Gyro Sensor based on Servo Motion Control System (3-Axis Gyro Sensor based on Servo Motion Control 시스템 개발)

  • Sun, Nana;Lee, Won-Bu;Park, Soo-Hong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 한국해양정보통신학회 2010년도 춘계학술대회
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    • pp.725-727
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    • 2010
  • For simulation of Boat motion, pitch, motion element of roll and yaw direction could simulated. The combination of the marine use various multi sensor surveillance system technology with the development of servo motion control algorithm and gyro sensor in six freedom motion is implemented to analyze the movement response. The stabilization of the motion control is developed and Nano driving Precision Pan-Tilt/Gimbal system is obtained from the security positioning cameras with ultra high speed device is used to carry out the exact behavior of the device.

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Positioning control error of 2-Axis Stage for Diamond Turning Machine (DTM가공을 위한 2축 Stage의 정밀 이송특성연구)

  • Lee E.S.;Park J.J.;Lee M.K.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 한국정밀공학회 2005년도 춘계학술대회 논문집
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    • pp.309-312
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    • 2005
  • DTM (Diamond Turning Machine) is using for ultra precision manufacturing such as, plastic lens die or aspherical optics. This study is on a design of precision 2-axis stage for DTM. We designed and manufactured a back lash free stage using different weights and measured the positioning accuracy using Interferometer. Also, the 2-D moving accuracy is measured using the high magnification CCD technique. Then, the stage is tested with the machining of spherical and aspherical lens in a DTM with air bearing spindle. It was shown that the back lash free stage is effective for improving the positioning accuracy. Also, positioning control errors in motion control board were able to be found using the proposed stages system.

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Simultaneous Positioning and Vibration Control of Chip Mounter with Structural Flexibility (칩마운터 구조물의 유연성을 고려한 위치와 진동 동시 제어)

  • Kang, Min Sig
    • Journal of the Semiconductor & Display Technology
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    • 제12권1호
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    • pp.53-59
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    • 2013
  • Chip mounter which is used to pick chips from the pre-specified position and place them on the target location of PCB is an essential device in semiconductor and LCD industries. Quick and high precision positioning is the key technology needed to increase productivity of chip mounters. As increasing acceleration and deceleration of placing motion, structural vibration induced from inertial reactive force and flexibility of mounter structure becomes a serious problem degrading positioning accuracy. Motivated from these, this paper proposed a new control design algorithm which combines a mounter structure acceleration feedforward compensation and an extended sliding mode control for fine positioning and suppression of structural vibration, simultaneously. The feasibility of the proposed control design was verified along with some simulation results.

Designing Compensators of Dual Servo System For High Precision Positioning (초정밀 위치 제어를 위한 이중 서보 시스템의 보상기 설계)

  • Choi, Hyeun-Seok;Song, Chi-Woo;Han, Chang-Soo;Choi, Tae-Hoon;Lee, Nak-Kyu;Na, Kyung-Whan
    • Proceedings of the KSME Conference
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    • 대한기계학회 2003년도 춘계학술대회
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    • pp.1309-1314
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    • 2003
  • The high precision positioning mechanism is used in various industrial fields. It is used in semiconductor manufacturing line, test instrument, Bioengineering, and MEMS and so on. This paper presents a positioning mechanism with dual servo system. Dual servo system consists of a coarse stage and a fine motion stage. The course stage is driven by VCM and the actuator of fine stage is the PZT. The purposes of dual servo system are stability, higher bandwidth, and robustness. Lead compensator is applied to this control system, and is designed by PQ method. Designed compensator can improve property of positioning mechanism.

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