• Proceedings of the KAIS Fall Conference
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• 2004.06a
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• pp.75-77
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• 2004

본 논문에서는 레그 익스텐션 기구의 안정성을 평가하기 위하여 3차원 유한요소 해석 코드인 ANSYS를 활용하여 구조해석을 실시하였다. 레그 익스텐션 기구를 제작함에 있어서 기존의 기구를 보완하고 운동효과의 향상, 안정성을 고려하여 설계하였다. 또한 레그 익스텐션 기구의 회전봉의 각도를 $0^{\circ}\~360^{\circ}$까지 회전가능하게 설계하여 운동하는 사람의 운동 강도를 조절할 수 있는 새로운 기구를 설계하였다.

• 전기의세계
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• v.45 no.4
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• pp.13-19
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• 1996

본고에서는 회전기의 절연열화진단을 위하여 이의 열화기구, 열화상태와 각 절연특성과의 상관관계로부터 절연상태평가에 관하여 논하고자 한다. 회전기는 종류도 다양하고 절연방식도 전압에 따라 다르지만, 여기서는 고압교류회전기에 관해서만 국한하기로 한다. 그리고 절연열화기구와 절연특성과의 상관성을 잘 알 수 있는 운전중지중(off-line) 절연진단법에 관한 것만 논의하기로 한다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.11a
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• pp.861-866
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• 1996

The Non-Circular Gears is more advantage than other machinery using link and cam in the automation equipment. We designed Non-Circular Gears for a velocity of inequalty rotational equipment according to the variation of pressure angle, radius of curvature etc., and studied about pitch curve.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.5 no.4
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• pp.326-330
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• 2004

This study is object to design and structural analysis of Leg Extension Machine. Design tool is AutoCAD and structural analysis of Leg Extension Machine using result from ANSYS Code. This structural analysis results, many variables such as boundary condition, constraint condition and load condition are considered.

• Journal of the Korean Society of Propulsion Engineers
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• v.12 no.2
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• pp.57-65
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• 2008

The atomization phenomena and spray characteristics of drum type rotary atomizer using centrifugal force from high rotational speed of gas turbine engine shaft were studied through rotary atomizer modeling analysis and experimental method. A test rig for rotary atomization that has range of $5,000{\sim}40,000\;rpm$ was used to make similarity for high speed rotating shaft. Spray visualization methodology and Phase Doppler Anemometry were also used to investigate the atomization mechanism and spray characteristics. We found that the rotating fuel spray has unique breakup process and we have to make breakup point earlier through increasing rotating speed to improve atomization performance.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.23 no.2
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• pp.183-189
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• 2010

This paper deals with the comparison of analysis methodologies by applying both Euler angle and quaternion to observe the kinematical behavior of the universal joint system used as an automotive drive-shaft. At first, conventional approaches are applied to predict a kinematical behavior by introducing only Euler angles into the universal joint system, but turns out to be lack in consistency and reliability of the analysis. Then to overcome this deficiency in numerical analysis a different methodology is proposed by using quaternion in this system. Its corresponding advantage is discussed in terms of kinetic energy, rotational velocity and rotational displacement. The application of quaternions in the numerical experiment is shown to be a more useful and valid way of establishing the ideal analytical model of the universal joint system.

• Journal of the Korean Society for Precision Engineering
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• v.32 no.3
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• pp.243-251
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• 2015

In order to develop an automatic system for welding thin steel plates with curvature such as the corrugated membranes of an LNG storage tank, a rotating mechanism should be firstly designed for the torch to easily follow the weld seam with a constant distance and angle. In this study, a torch rotating mechanism consisting of three circular links, two square-type links and a torch link was proposed for automation of the welding process. A weld-seam tracking system with two axis slides and the proposed rotating mechanism was successfully simulated with a dynamic simulation software. A prototype tracking system was manufactured and a tracking test with the system was then carried out. The test results with tracking system showed that the rotating mechanism could be implemented and it was feasible to be used in automatic tracking of weld seam with curvature.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.4
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• pp.539-544
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• 2006

This study is to apply a modal analysis for a frame and roller of a treadmaill machine. A finite element model was developed to compute natural frequencies of a frame and a roller. This analysis were performed under several different conditions such as weight, boundary, and maxium stress/strain conditions.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.06a
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• pp.289-290
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• 2008

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2005.05a
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• pp.180-183
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• 2005

본 논문에서는 새로운 형태의 혼합형 5자유도 마이크로 매니퓰레이터를 제안하고 개발하고자 한다. 제안된 기구는 평면형 2자유도 XY-stage와 공간형 3자유도 병렬 기구로 구성된다. 3자유도 병렬기구는 3개의 직렬체인으로 이루어져 있으며, 공간상에서 두 방향의 회전 움직임과 Z축 방향으로의 병진운동을 생성한다. 모의실험을 통하여 개발된 기구의 작업공간과 출력단에서의 정밀도 해석을 수행한다. 개발된 기구는 조작 대상 물체의 미세 위치제어를 필요로 하는 반도체 및 기계, 생물, 의료분야 등에 적용 될 수 있다.