• Title/Summary/Keyword: View Axis

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Implementation of a 2-axis Additional Axes Strategy on a 6-axis Articulated Robot for Improving Welding Process Efficiency (2축 부가 축을 이용한 6축 수직 다관절로봇의 용접공정효율 증대를 위한 연구)

  • Hong, Jun-Rak;Jo, Hyeon-Min;Chung, Won-Jee;Park, Seung-Kyu;Noh, Seong-Hoon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.6
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    • pp.55-62
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    • 2017
  • This paper aims to realize additional axes, which increase the processing efficiency of a robot by controlling in harmful environments. Ultimately, this is to create time and energy savings in industrial sites with 6-axis articulated welding robots (RS2). Using $RecurDyn^{(R)}$ a simulation technique is applied. The motion paths of the welding rod are compared for two cases in order to verify the necessity of the additional axes: 1) when there are no additional axes and 2) when there are additional axes during welding using the RS2. For this purpose, the angle variations of the RS2 axes required for the simulation are compared, on the assumption that each of the four points of the welding bed installed on the additional axes of the welding rod in $Solidworks^{(R)}$ is point-welded. Then, actual additional axes equipment is grafted on to the RS2 and the process times compared using $LabVIEW^{(R)}$.

Optical Design of a Wide-field Off-axis Two-mirror System without Ray Obstruction (광선의 차폐가 없는 광시야 비축 2반사광학계 설계)

  • Oh, Hye-Jin;Lee, Jong-Ung
    • Korean Journal of Optics and Photonics
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    • v.28 no.6
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    • pp.263-272
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    • 2017
  • To design a wide-field optical system, the inverted telephoto configuration, which has a negative front group and a positive rear group, is popular. For a two-mirror system, the inverse Cassegrain system has the inverted telephoto configuration, but the inverse Cassegrain system with the conventional, axially symmetric configuration shows severe field screening and ray obstruction. To avoid these problems, we put the aperture stop on the secondary mirror of an inverse Cassegrain system to increase field of view, and designed a wide-field off-axis two-mirror system which only uses the off-axis field, without ray obstruction.

Optical Design of an Off-axis Five-mirror-anastigmatic Telescope for Near Infrared Remote Sensing

  • Li, Xing Long;Xu, Min;Pei, Yun Tian
    • Journal of the Optical Society of Korea
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    • v.16 no.4
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    • pp.343-348
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    • 2012
  • This paper described an off-axis five-mirror-anastigmatic telescope. It is composed of three aspheric surfaces and one spherical surface while the third mirror and fifth mirror have the same parameters at the same place. This configuration is useful for having wide field of view. The strip full field of view for the near infrared telescope is $20^{\circ}{\times}0.2^{\circ}$. The entrance pupil is located in front of the first mirror. There is an intermediate image between the second mirror and the third mirror. The entrance pupil diameter is 100 mm and the effective focal length is 250 mm. The spectral range is $0.85-1.75{\mu}m$. The pixel pitch is $15{\mu}m$. The image quality is near the diffraction limit. Some methods were used to restrain the stray light such as a field stop near the intermediate image, the baffle, the narrow-band pass filter and a stop in front of the focal plane.

A Study on the Vernacular landscape Pattern of Nagan Walled Town(낙안읍성) in Suncheon

  • Shin, Sang-Sup;Park, Jae-Hyun
    • Journal of Environmental Science International
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    • v.13 no.2
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    • pp.109-116
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    • 2004
  • Nagan walled town is located on an axis connecting symbolic places, which is a lucky place from the Fengshui point of view because a mountain sits to the rear and a body of water sits to the front. It represents the environmental development of cultural space by blending folk belief, religion, social systems, adminstration facilities and living culture buildings. Therefore, it has a sustainable cultural view connected with a formed or formless religious view and an artificial view (walls, government buildings, living houses, cultivated lands, etc.) in a natural landscape. Environmental design techniques, enlarging the meaning and value of living on a mental level, can be found in the arrangement of space composition and settlement of Nagan walled town. The organised spaces of government and residential areas were constructed within the wall with the view of searching for lucky places (from best, better and good places) in order to construct ecological networks according to the outlooks of space and settlement.

A Study oA study on the Baroquely characteristics in Korean Temple Architecture (바로크적 특성으로 본 한국 사찰건축 -공주 마곡사를 대상으로-)

  • Koh, In-Lyong;Dong, Jae-Uk
    • Journal of The Korean Digital Architecture Interior Association
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    • v.2 no.1
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    • pp.39-44
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    • 2002
  • Purpose of this paper is to find the Baroquely characteristics in Korean Temple Architecture.(MA KOK-SA) We could find out the characteristics as follows; First, visual freedom and floating in the arrangement of the temple buildings through segmenting the axis. Second, tension of variations in size, distance, and frame. Third, diverse sceneries provided by Sequential(dynamic) view points. Fourth, visual process and sharp contrast between horizontality and verticality, and unexpected scenery, etc.

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Echocardiograpical Findings of Heartworm Disease with Paradoxic septum motion and Caval Syndrome in a Pug Dog (개심장사상충 중감염에 따른 심실중격기이운동과 대정맥증후군의 심장초음파상)

  • 박인철
    • Journal of Veterinary Clinics
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    • v.18 no.3
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    • pp.297-303
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    • 2001
  • A female pug was presented with severe anemia, dyspnea and hemoglobinuria. By B- and M-mode echocardiography, the large number of heartworm were founded in the right ventricle, right atrium and pulmonary artery. The heartworm mass was moved from the right ventricle to the right atrium with the motion of the tricuspid value. Paradoxic septum motion were visible in M-mode of left ventrcular outflow tract and chordae tendineae level short-axis view. Flattened interventricular septum was find in B-mode of papillary muscle level short-axis view. In autopsy, 81 adult heartworms and 7 filarial debris were found. Most of adult heartworm were found in the right ventricle and pulmonary artery. 3 of them were found in the venaca and right atrium, respectively.

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Signal Processing Method for Noise Reduction of Multi-Axis Force Sensors (다축힘센서의 노이즈신호 개선을 위한 신호처리 방법)

  • 김용찬;강철구;남현도
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1026-1029
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    • 2003
  • There are always some errors in force sensing of multi-axis force sensors that aggravate sensor performance. Error sources may be classified mainly in two groups. One is structural error due to inaccuracy of sensor body, and the other is error due to noise signals existing in the sensed information. This paper presents a brief review about the principle of multi-axis force sensors, and then a method that can reduce the effect of noise signals. The method is to read digital signals in computer instead of analog voltage signals. We can eliminate the bad effect of electromagnetic waves emitted from computer and of 60 Hz noise emitted from AC source by the proposed method. The proposed method is investigated through experimental demonstration. The experimental results show the proposed method improves the sensor performance significantly.

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Stabilization of Target Tracking with 3-axis Motion Compensation for Camera System on Flying Vehicle

  • Sun, Yanjie;Jeon, Dongwoon;Kim, Doo-Hyun
    • IEMEK Journal of Embedded Systems and Applications
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    • v.9 no.1
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    • pp.43-52
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    • 2014
  • This paper presents a tracking system using images captured from a camera on a moving platform. A camera on an unmanned flying vehicle generally moves and shakes due to external factors such as wind and the ego-motion of the machine itself. This makes it difficult to track a target properly, and sometimes the target cannot be kept in view of the camera. To deal with this problem, we propose a new system for stable tracking of a target under such conditions. The tracking system includes target tracking and 3-axis camera motion compensation. At the same time, we consider the simulation of the motion of flying vehicles for efficient and safe testing. With 3-axis motion compensation, our experimental results show that robustness and stability are improved.

Five-axis CL Data Generation by Considering Tool Swept Surface Model in Face Milling of Sculptured Surface (공구이동궤적 모델을 이용한 5축 페이스밀링 가공데이터 생성)

  • 이정근;박정환
    • Korean Journal of Computational Design and Engineering
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    • v.9 no.1
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    • pp.35-43
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    • 2004
  • It is well known that the five-axis machining has advantages of tool accessibility and machined surface quality when compared with conventional three-axis machining. Traditional researches on the five-axis tool-path generation have addressed interferences such as cutter gouging, collision, machine kinematics and optimization of a CL(cutter location) or a cutter position. In the paper it is presented that optimal CL data for a face-milling cutter moving on a tool-path are obtained by incorporating TSS(tool swept surface) model. The TSS model from current CL position to the next CL position is constructed based on machine kinematics as well as cutter geometry, with which the deviation from the design surface can be computed. Then the next CC(cutter-contact) point should be adjusted such that the deviation conforms to given machining tolerance value. The proposed algorithm was implemented and applied to a marine propeller machining, which proved effective from a quantitative point of view. In addition, the algorithm using the TSS can also be applied to avoid cutter convex interferences in general three-axis NC machining.