• Title, Summary, Keyword: Transformation Line

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A Study on Weld Line Detection and Wire Feeding Rate Control in GMAW with Vision Sensor (GMAW에서 시각센서를 이용한 용접선 정보의 추출과 와이어 승급속도의 제어에 관한 연구)

  • 조택동;김옥현;양상민;조만호
    • Journal of Welding and Joining
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    • v.19 no.6
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    • pp.600-607
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    • 2001
  • A CCD camera with a laser stripe was applied to realize the automatic weld seam tracking in GMAW. It takes relatively long time to process image on-line control using the basic Hough transformation, but it has a tendency of robustness over the noises such as spatter and arc light. For this reason. it was complemented with adaptive Hough transformation to have an on-line processing ability for scanning specific weld points. The adaptive Hough transformation was used to extract laser stripes and to obtain specific weld points. The 3-dimensional information obtained from the vision system made it possible to generate the weld torch path and to obtain the information such as width and depth of weld line. We controled the wire feeding rate using informations of weld line.

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Developed Inherent Strain Method Considering Phase Transformation of Mild Steel in Line Heating (선상가열시 강의 상변태를 고려한 개선된 고유변형도 기반의 등가하중법)

  • Ha, Yun-Sok;Jang, Chang-Doo
    • Journal of the Society of Naval Architects of Korea
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    • v.41 no.6
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    • pp.65-74
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    • 2004
  • The inherent strain method is known to be very efficient in predicting the deformation of steel plate by line heating. However, in the actual line heating process in shipyard, the rapid quenching changes the phase of steel. In this study, In order to consider additional effects under phase transformation, inherent strain regions were assumed to expand. Also, when calculating inherent strain, material properties of steel in heating and cooling are applied differently considering phase transformation. In this process, a new method which can reflect thermal volume expansion of martensite is suggested.8y the suggested method, it was possible to predict the plate deformations by line heating more precisely.

The Welding Process Control Using Neural Network Algorithm (Neural Network 알고리즘을 이용한 용접공정제어)

  • Cho Man Ho;Yang Sang Min
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.12
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    • pp.84-91
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    • 2004
  • A CCD camera with a laser stripe was applied to realize the automatic weld seam tracking in GMAW. It takes relatively long time to process image on-line control using the basic Hough transformation, but it has a tendency of robustness over the noises such as spatter and arc tight. For this reason, it was complemented with adaptive Hough transformation to have an on-line processing ability for scanning specific weld points. The adaptive Hough transformation was used to extract laser stripes and to obtain specific weld points. The 3-dimensional information obtained from the vision system made it possible to generate the weld torch path and to obtain the information such as width and depth of weld line. In this study, a neural network based on the generalized delta rule algorithm was adapted for the process control of GMA, such as welding speed, arc voltage and wire feeding speed.

A Study on Automatic Seam Tracking using Vision Sensor (비전센서를 이용한 자동추적장치에 관한 연구)

  • 전진환;조택동;양상민
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1105-1109
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    • 1995
  • A CCD-camera, which is structured with vision system, was used to realize automatic seam-tracking system and 3-D information which is needed to generate torch path, was obtained by using laser-slip beam. To extract laser strip and obtain welding-specific point, Adaptive Hough-transformation was used. Although the basic Hough transformation takes too much time to process image on line, it has a tendency to be robust to the noises as like spatter. For that reson, it was complemented with Adaptive Hough transformation to have an on-line processing ability for scanning a welding-specific point. the dead zone,where the sensing of weld line is impossible, is eliminated by rotating the camera with its rotating axis centered at welding torch. The camera angle is controlled so as to get the minimum image data for the sensing of weld line, hence the image processing time is reduced. The fuzzy controller is adapted to control the camera angle.

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Data Transformation System Implementation for the Automation of PCB Product (PCB 생산 자동화를 위한 데이터 변환 시스템 구현)

  • Lee Seung-Hyuk;Kim Gui-Jung;Han Jung-Soo
    • The Journal of the Korea Contents Association
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    • v.5 no.5
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    • pp.17-25
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    • 2005
  • In this paper, we design data transformation interface for the automation of PCB product. The data designed to CAD does not exchange itself for the assembly line, so we construct an automation system which is exchangeable. To do this, we analyze the information of PCB components and construct the Information of IC components as database. We also develope two kinds of algorithm; one is to detect human error and another is to exchange itself for the data which is suitable for PCB assembly line. We design data transformation interface to do addition and revision of the information for PCB assembly line. By automating existing manual processing, we are able to shorten access time and enhance reliability of the data and the efficient assembly line of PCB.

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Localization for Mobile Robot Using Vertical Line Features (수직선 특징을 이용한 이동 로봇의 자기 위치 추정)

  • 강창훈;안현식
    • Journal of Institute of Control, Robotics and Systems
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    • v.9 no.11
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    • pp.937-942
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    • 2003
  • We present a self-localization method for mobile robots using vertical line features of indoor environment. When a 2D map including feature points and color information is given, a mobile robot moves to the destination, and acquires images from the surroundings having vertical line edges by one camera. From the image, vertical line edges are detected, and pattern vectors meaning averaged color values of the left and right regions of the each line are computed by using the properties of the line and a region growing method. The pattern vectors are matched with the feature points of the map by comparing the color information and the geometrical relationship. From the perspective transformation and rigid transformation of the corresponded points, nonlinear equations are derived. Localization is carried out from solving the equations by using Newton's method. Experimental results show that the proposed method using mono view is simple and applicable to indoor environment.

A Study on Size Transformation for Dot Pattern by the 4-Direction Line Segmentation Algorithm (4방향 선분 분리법에 의한 도트 패턴의 크기 변화에 관한 연구)

  • 정회경;이수연
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.24 no.6
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    • pp.1013-1019
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    • 1987
  • This paper proposes the four directional line segmentation method to transform the size of dot patterns such as character dot patterns, line drawings and so on, while maintaining the quality of original pattern. At the first, this method extracts three kinds of line segmentm, namely horizontal, vertical line and slant line, and then transforms dot patterns using the each rules which are appricable to each kind of extracted line segments. Our experimental results show that transformation of dot patterns can be succeed in good quality without implementing some kinds of smoothing processes, covering the continuous transforming ratio of 0.5 to N times.

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A Study on Automatic Seam Tracking using Vision Sensor (비전센서를 이용한 용접선 자동추적에 관한 연구)

  • 조택동;양상민;전진환
    • Journal of Welding and Joining
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    • v.16 no.6
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    • pp.68-76
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    • 1998
  • A CCD camera with a laser stripe was applied to realized the automatic weld seam tracking. The 3-dimensional information obtained from the vision system made it possible to generate the weld torch path. The adaptive Hough transformation was used to extract laser stripes an to obtain specific weld points. It takes relatively long time to process image on-line control using the basic control using the basic Hough transformation, but it has a tendency of robustness over the noises such as spatter. For this reason, it was complemented with adaptive Hough transformation to have an on-line processing ability for scanning specific weld points. The dead zone, where the sensing of weld line is impossible, was eliminated by rotating the camera with its rotating axis centered at the weld torch. When weld lines were detected, the camera angle was controlled in order to get the minimum image data for sensing of weld lines. Consequently, the image processing time was reduced.

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Development of Pipe Fault Inspection System using Computer Vision (컴퓨터 비젼을 이용한 파이프 불량 검사시스템 개발)

  • 박찬호;양순용;안경관;오현옥;이병룡
    • Journal of Institute of Control, Robotics and Systems
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    • v.9 no.10
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    • pp.822-831
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    • 2003
  • A computer-vision based pipe-inspection algorithm is developed. The algorithm uses the modified Hough transformation and a line-scanning approach to identify the edge line and the radius of the pipe image, from which the eccentricity and dimension of the pipe-end is calculated. Line and circle detection was performed using Laplace operator with input image, which are acquired from the front and side cameras. In order to minimize the memory usage and the processing time, a clustering method with the modified Hough transformation is introduced for line detection. The dimension of inner and outer radius of pipe is calculated by the proposed line-scanning method. The method scans several lines along the X and Y axes, calculating the eccentricity of inner and outer circle, by which pipes with wrong end-shape can be classified and removed.

On-line measurement of metallurgical transformation in hot-rolled steel (열연공정의 온라인 변태율 측정장치)

  • Kim, Sang-Young;Kang, Myoung-Koo
    • Proceedings of the KIEE Conference
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    • pp.711-713
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    • 1997
  • The mechanical properties of a hot rolled steel is mostly governed by a cooling control on the run out table. During the cooling control, the hot rotted steel performs a metallurgical transformation(austenite ${\to}$ ferrite) which can be measured with a magnetic flux detector. The magnetic flux detector consisting of exciting and detecting coil can estimates the metallurgical transformation by measuring the variation of permeability in steel. We developed the method of detecting the magnetic property of hot rolled steel and processing the measured signal, Which makes possible to measure on-line metallurgical transformation.

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