• 제목/요약/키워드: Dimensional measurement accuracy

검색결과 352건 처리시간 0.035초

Development of a Precision Distance Sensor by Using One-dimensional CCD

  • Jang, Se-Jung;Boo, Kwang-Suck;Lim, Sung-Hyun;Lee, Seung-Young
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2001년도 ICCAS
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    • pp.118.2-118
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    • 2001
  • This research describes a development of laser distance sensor with precise resolution even in the case that the object surface has some curvature. There are typical two methods in measuring the distance by using laser light source, so called time of flight and optic-triangular methods. Both methods have an advantage and a disadvantage each other. In general, the time of flight method produces wide range of the measurement, but low accuracy. The other method is vice versa. In this research, the optic-triangular methods with one-dimensional CCD cell are proposed to obtain the precise distance measure from the sensor the surface of the curved object ...

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CT 법을 이용한 진직도 및 직각도 측정에 관한 연구 (A Study on the Measurement for Straightness and Orhogonality Using CT Method)

  • 이승수;김민주;박정보;전언찬
    • 한국공작기계학회논문집
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    • 제11권1호
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    • pp.83-90
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    • 2002
  • As high-precision parts are needed with manufacturing techniques improved. the demand of high-precision machine tools has been increasing They are made to developed the precision measuring skill to maintenance the accuracy of themselves as a matter or course We one paper measured straightness and orthogonality of the square to verify that it is possible for CT(circular test) method by 2-dimensional probe and the square to measure orthogonality Furthemore we compared the result of the study with the computer simulation's to prove its possibility and made an improvement of measuring method.

의료용 적외선 영상장치의 구현 (Development of Medical Infrared Imaging System)

  • 이수열;우응제;조민형;송형빈
    • 대한의용생체공학회:학술대회논문집
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    • 대한의용생체공학회 1993년도 춘계학술대회
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    • pp.17-20
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    • 1993
  • With proper designs of infrared optic system and two dimensional scanning mechanism, a medical infrared imaging system has been developed. The infrared imaging system can be used for two dimensional imaging of surface temperature of human body by measuring the amount of infrared lights radiating from it. It hag been experimentally proven that the degree of temperature measurement accuracy of the developed system is under $0.1^{\circ}C$ with spatial resolution of 1 mrad, image matrix size of $256{\times}240$, and imaging time of 4 seconds.

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3차원 좌표측정기의 기어측정능력평가를 위한 실험적 연구 (A Study on the Evaluation of the Gear Measurement Capability of a 3 Dimensional Coordinate Measuring Machine)

  • 심창건;변재현
    • 산업공학
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    • 제12권2호
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    • pp.180-192
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    • 1999
  • A coordinate measuring machine (CMM) is a computer-controlled measuring device that uses a probe to obtain measurements on a manufactured part's surface. CMM's have been very popular over traditional hard gauges due to their flexibility, accuracy, and ease of automated inspection. This paper considers the use of a CMM for the inspection of gears. We compare the inspection capability of a CMM and that of a gear-specific measuring machine. The result of this paper may benefit gear manufacturing companies in their dimensional quality assurance activities, especially for special type gears and for large-scale gears which are not measurable by gear-specific measuring machines.

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대형구조물의 효율적 3차원 용접잔류응력해석을 위한 새로운 이동 온도 프로파일 방법 (Moving Temperature Profile Method for Efficient Three-Dimensional Finite Element Welding Residual Stress Analysis for Large Structures)

  • 김철호;김재민;김윤재
    • 한국압력기기공학회 논문집
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    • 제19권2호
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    • pp.75-83
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    • 2023
  • For three-dimensional finite element welding residual stress simulation, several methods are available. Two widely used methods are the moving heat source model using heat flux and the temperature boundary condition model using the temperature profile of the welded beads. However, each model has pros and cons in terms of calculation times and difficulties in determining welding parameters. In this paper, a new method using the moving temperature profile model is proposed to perform efficiently 3-D FE welding residual stress analysis for large structures. Comparison with existing experimental residual stress measurement data of two-pass welding pipe and SNL(Sandia National Laboratories) mock-up canister shows the accuracy and efficiency of the proposed method.

Preliminary study of time-of-flight measurement for 3D position sensing system based on acoustic signals

  • Kim, Heung-Gi;Park, Youngjin
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2002년도 ICCAS
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    • pp.79.4-79
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    • 2002
  • Our goal is the development of a system that estimates the location of interested point in a room with accuracy and low cost. Non-contacting position estimating method is widely used in various areas. Among these methods, acoustic signal-based method is the cheapest and provides reasonably accurate estimation as a result of many research efforts. Most of the acoustic-signal-based three-dimensional location estimators such as 3D sonic digitizer are using the ultrasound, and are organized with two procedures; time-of-flight (TOF) estimation and localization estimation. Since the errors in estimating the TOF could be accumulated with that of localization estimate, accuracy of TOF estimate is as...

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A Study on Enhancement of Grinding Accuracy by an Active Tool Control

  • Oh, Chang-Jin;Kim, Ock-Hyun
    • Journal of Mechanical Science and Technology
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    • 제16권5호
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    • pp.633-638
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    • 2002
  • An approach to enhance dimensional accuracy of the grinding process has been presented, and grinding of a glass material with a metal-bonded diamond wheel has been studied. In this study, a grinding tool is suspended flexibly and controlled by an electromagnetic actuator. During grinding, profile error of a ground surface is indirectly measured and fed back to a control system. A model of grinding error has been suggested on which the indirect measurement has been based. An optimal PID control is adopted and effectiveness of the in-process feedback control has been verified experimentally.

로보트 성능측정 및 Calibration 시스템 (Robot performance test and calibration systme)

  • 김문상;유형석;장현상;허재범
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1990년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 26-27 Oct. 1990
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    • pp.596-601
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    • 1990
  • When using robot manipulator to carry out autonomous tasks, the positioning accuracy of the robot manipulator relative to a reference coordinate frame is of greate importance. The task program, which is generated by off-line CAD-system and used in actual robot positioning, may cause serious amount of the absolute positioning error of the robot manipulator. In this study, a robot performance test and calibration algorithms are proposed in order to improve the absolute positioning accuracy of the robot end effector. Experiments were also carried out by utilizing the HYUNDAI Robot AE 7601 and KIM2-Tester, a three dimensional measurement system, which is developed in Robotics & Fluid Power Control Lab. at Korea Institute of Science and Technology.

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Geometrical Compensation of Injection-Molded Thin-Walled Parts in Reverse Engineering

  • Kim Yeun Sul;Lee Hi Koan;Huang Jing Chung;Kong Young Sik;Yang Gyun Eui
    • International Journal of Precision Engineering and Manufacturing
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    • 제6권2호
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    • pp.12-18
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    • 2005
  • A geometric compensation of thin-walled molded parts in reverse engineering is presented. Researches in reverse engineering have focused on the fitting of points to curves and surfaces. However, the reconstructed model is not the geometric model because the molded parts have some dimensional errors in measurements and deformation during molding. Geometric information can give an improved accuracy in reverse engineering. Thus, measurement data must be compensated with geometric information to reconstruct the mathematical model. The functional and geometric concepts of the part can be derived from geometric information. LSM (Least square method) is adopted to determine the geometric information. Also, an example of geometric compensation is given to improve the accuracy of geometric model and to inspect the reconstructed model.

리드 프레임 타발공정의 전단특성에 관한 연구(1) -전단 공정 인자의 영향 (A Study on the Characteristics of the Precision Blanking of Lead Frame (1): Influences of Blanking Process Variables)

  • 임상헌;서의권;심현보
    • 소성∙가공
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    • 제10권5호
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    • pp.425-432
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    • 2001
  • In order to investigate the influences of process parameters on the shape of lead frame, experimental study has been carried out. In the experiment, dimensional accuracy of the die sets, measurement accuracy has been managed carefully enough to simulate actual lead frame blanking process. With the blanking of square-shaped specimen, the effects of clearance, strip holding pressure and bridge width on the shape of blanked profile have been investigated. Experimental results show that the burnish ratio is increased as the clearance decreases. the strip holding pressure increases, and bridge width increases. Although the results seems to be similar to the ordinary blanking, the lead frame blanking shows a subtle different characteristics to the ordinary blanking due to the narrow bridge width.

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