• Journal of Korean Electronics
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• v.6 no.11
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• pp.65-67
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• 1986

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.512-513
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• 2017

In this paper, an automatic sowing system which arranges the seeds gathered using inhaling technique, on the upper part of cells in trays, is developed to improve the sowing efficiency. In the system, the seeds in inhaled into the vacuum drum, then the seeds are exhausted and arranged on the rotating tray, resulting in rapid sowing system. Also, the velocity control algorithm for the conveyor belt transporting tray is developed to compensate the velocity error generated while the belt is carrying the tray. The velocity control algorithm controls the pulses applying to the stepper motor rotating the drum.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.2591-2593
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• 2005

본 연구는 물체의 좌우측 상단에 연결된 와이어로프를 모터 및 드럼을 통하여 감아 올리거나 내려 놓는 과정에서 물체가 수평상태를 유지하여 이동될 수 있도록 Two Motor-Two Drum 형식의 권양기를 제어 하는 권양기의 밸런스제어장치에 관한 것이다. 본 연구에 Two Motor-Two Drum 형식의 권양기 제어장치에 있어서, 물체의 상단에 연견된 일측 와이어로프와 타측 와이어로프의 이동길이를 실시간으로 검출하는 와이어로프 이동길이검출부와, 이 와이어로프 이동길이검출부를 통하여 검출되는 일측 와이어로프와 타측 와이어로프의 이동길이를 비교하여 물체의 기울어진 좌 우 편차를 검출하는 편차검출부와, 이 편차검출부를 통해 검출되는 좌우 편차를 제거하기 위하여 일측 또는 타측 와이어로프가 감겨있는 드럼을 회전시키는 모터의 구동속도를 조절하여 물체를 수평상태로 보정하는 밸런스제어부로 구성 되어 있다.

• 제어로봇시스템학회:학술대회논문집
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• 1991.10a
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• pp.457-462
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• 1991

Recently, digital techniques have been applied to servo systems of the home VCR, which result in high accuracy, high stability and a small number of parts required. The servo systems are now becoming more compex because the latest home VCRs are stringly required to have many functions. Given these circumstances, software servo concepts were introduced to the VCR servo system with microprocessor. But there are some difficulties in the conventional digital PID controller, eg. caculating the exact gains or dynamics. In this paper, we introduce FLC(Fuzzy Logic Controller) to the speed/phase control for VCR drum motor. To show the usefulness of the proposed controller, some studies are discussed by simulation and experiment.

• Proceedings of the Korean Reliability Society Conference
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• 2004.07a
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• pp.297-301
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• 2004

세탁기의 Shaft Ass'y는 모터로부터 동력을 전달 받아 세탁 및 탈수행정의 제어 기능을 수행하는 세탁기의 핵심부품으로 사용 중 브레이크 밴드소음을 유발하여 소비자의 불만족 요소로 작용하고 있다. 그러나 드럼과 브레이크 페드의 정확한 마찰소음 현상 규명이 안되어 불량 개선에 많은 어려움이 있다. 이를 해결하고자 소음, 진동, 소재 분석 및 ESPI(Electronic Speckle Pattern Interferometry) 분석을 통해 고장원인을 규명하였다. 특히 ESPI는 비접촉, Full Field 정밀 변형 가시화 장치로 Shaft Ass'y의 동작 중 공진소음 발생 부위를 변형 가시화를 통해 정확하게 찾을 수 있었다. 밴드소음 원인은 브레이크 Lever의 공진에 의해 발생하였고 브레이크 밴드 패드의 접촉면적 불균일로 인한 국부적 마찰력 증대가 소음원으로 작용하였다. 밴드소음의 정확한 고장 메커니즘 규명을 통해 개선안을 도출하여 적용하였고 밴드소음 개선효과를 얻을 수 있었다.

• Journal of Korean Society of Forest Science
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• v.97 no.1
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• pp.61-70
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• 2008

This study was conducted to develop a mobile tower-yarder with tractor for agriculture and forestry that is the efficient yarder in steep terrains, thinning operation and small scale logging operation. It was designed and manufactured that the power source of tower-yarder is equiped three hydraulic pump connected to PTO of tractor, and three hydraulic pump is used to operate the four motor for drum, the cylinder for clutch of interlocker, the cylinder for tower expanding and the out-rigger cylinder. It was to adopt the running skyline system and the inter-lock function, and to equip the double capstan drum, the storage drum and the clutch for interlock in the development of tower-yarder. It was to develop the tower-yarder which the winch torque of double-capstan drum, the traction force of double-capstan drum, the number of rotation of double-capstan drum and the line speed is $191kg{\cdot}m$, 1,910 kgf, 220.5 rpm and 138.5 m/min, respectively. And it was known that the optimum flange diameter of the main and haulback storage drum is about 360 mm and about 460 mm in order to storage the main line length of 250m and the haulback line length of 450 m. The carriage was made to adopt the running skyline system and to equip the lock function in order to the convenience of chocking and the fall down preventing of tree. It was provided to develop the wire remote controller for the inter-lock function, the convenience of control and the efficiency of yarding. In development process, this tower-yarder was attached the 3-point linkage hitch equipment and the tire wheel for the traction and moving of tower-yarder. Also, it was equipped that the out-rigger and the guy line in order to raise the safety and efficiency of yarding of tower-yarder.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.23 no.7
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• pp.585-596
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• 2013

This study introduces a hybrid approach combining numerical results with pre-developed analytical calculations for the sound radiation from the modal vibration of a thick, finite length cylinder with various boundary conditions. Structural vibrations of the cylinder are numerically investigated with the finite element method, and distributions of vibratory displacements on the cylinder surface are idealized as simple mathematical expressions based on the numerical results. Sound radiations from the normal vibration of the cylinder are calculated based on idealized modal displacements using a previously introduced theoretical solution. The results are confirmed with numerical analyses using the boundary element method. Based on these results, it can be concluded that the solutions suggested in this study have good accuracies in calculating the vibro-acoustic properties of a thick, finite cylinder with various boundary conditions. Also, the sound radiation characteristics of many practical components such as brake drums and motor housings are expected to be investigated using the procedure proposed in this study.

• Journal of the Korean Institute of Gas
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• v.23 no.4
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• pp.40-45
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• 2019

This paper is a purpose to study the failure example for heavy-duty vehicle fire. The first example, the researcher found the engine over-heating phenomenon causing a coolant leakage by the sealing poor of head-gasket because of D-ring part deformation contacting with cylinder liner top-part and cylinder head. He certified a fire breakout by short transferred to surrounding wiring of air-cleaner. The second example, a brake lining by return fault of break operating S cam causing with much wear of a rear 4 wheel brake lining repeatably was worn by friction. In the long run, it became the cause of fire. The third example, the researcher knew the fire cause was came about the short of wire by overload of tilting motor when the driver tilted up the cap to inspect a engine. Therefore, a heavy-duty fire must minimize the fire occurrence by thorough controlling.