• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2012.10a
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• pp.492-493
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• 2012

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2012.10a
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• pp.435-436
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• 2012

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.845-846
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• 2010

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.849-850
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• 2010

• The Bulletin of The Korean Astronomical Society
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• v.37 no.1
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• pp.52.2-52.2
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• 2012

1438년 장영실은 경복궁 흠경각(欽敬閣) 내부에 자동물시계인 옥루(玉漏)를 제작하였다. 흠경각루(欽敬閣漏)는 수격식(水激式, 물의 흐름을 이용하여 수차를 운행하는 동력방식)으로 운영되는 것으로 중국의 수운의상대(水運儀象臺, 1092년경 제작)의 수격방식과 유사하다. 하지만 동력 방식을 제외한 내부 구조에 대한 것은 흠경각루의 외형모습인 가산 형태, 시보인형의 구성과 배치, 작동구조 등에 의해 결정된다. 장영실은 흠경각루의 내부 기어장치의 구성과 연결 등에 대해서 새로운 제작기술을 사용하였다. 우리는 수격식 동력 방식에서 내부 공간에 따른 각각 운행 장치들의 구성과 동력전달체계에 대하여 분석하였다. 또한 수차가 일정한 회전력을 갖도록 제어하는 천형(天衡) 장치에 대하여 고찰하였다.

• Transactions of the Korean Society of Automotive Engineers
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• v.20 no.6
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• pp.33-38
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• 2012

EMB is considered as the next generation braking mechanism because it has simple structure and is environment friendly. However, as other brake mechanisms, EMB should be operated reliably for any operating conditions. EMB should be designed with fail-safe and fault-tolerant control concepts which require robust fault detection algorithms for various possible faults. In the design of fault detection algorithms, it is very difficult to construct faulty conditions in real EMB and thus, simulations are often used to emulate the faulty conditions. In this paper, a simulation tool is developed using the commercial software to emulate gear faults in the EMB mechanism. A backlash compensation algorithm is introduced based on contact point detection because screw backlash causes a delay in clamping force response time.

• Transactions of the Korean Society of Automotive Engineers
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• v.16 no.4
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• pp.135-142
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• 2008

Hydraulic power steering system has been adopted in seniority passenger and commercial vehicle system for an easy maneuverability and a smoother ride. In this study, hydraulic power steering system analysis model which includes hydraulics and mechanical sub-systems was developed using commercial software, AMESim in order to predict characteristics for various steering components. Each component which constructs system was modeled and verified by experimentally obtained characteristics curves of each components. The parameter sensitivity analysis such as valve opening area, torsional stiffness of torsion bar for system design are carried out by the analysis and experimental method. The predicted results by the development model were a good agreement with experimentally obtained results. The sensitivity investigation results rotary torque when changing an input shaft edge width, was most sensitive, to change in angle and slot width and supply flow of input shaft edge is not a lot sensitively.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2007.04a
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• pp.448-452
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• 2007

본 논문은 선박의 축계마력 측정방법 및 측정시스템의 개발방법에 대해 논의한다. 엔진 축계에서의 정확한 출력은 선박의 사용목적, 관련추진축계의 제작 및 설치비용 등과 밀접한 관련을 맺고 있다. 본 연구에서는 동력 전달측과 부하측사이의 축상에 두 개의 기어휠을 설치하고 각각의 기어휠에 비접촉식 검출기를 부착하여 위상을 계측한다. 동력이 가해질 경우 두 지점에서는 비틀림 각에 의한 위상차가 발생하게 되고, 발생된 위상차를 전압신호로 검출하여 축에서의 마력을 계산하게 된다.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.18 no.3
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• pp.279-284
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• 2009

This study investigates the stress at gear by modelling differential gear and using FEM. When gear is driven under power, high equivalent stress of 1596.2MPa is occurred at the stationary shaft. Maximum equivalent stress of 1596.2MPa is also occurred at the bottom and root of tooth and its fatigue life becomes 12.4 as the shortest cycle. As much as it becomes away from the center of gear, the maximum deformation becomes occurred. As exact power is delivered with the precise design of gear, the loss of power energy can be decreased.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2007.11a
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• pp.697-701
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• 2007

In this paper, noise sources of a planocentric gear reducer are identified by experimental mehod. This study consider a reduction method of a noise/vibration about the gear, axle, bearing and others. Namely, the purpose of this study is to reduce a noise/vibration for a stability of the total system. Form the data to be measured through an experimental method, the problems of the gear, axle, bearing and others are examined closely, and the reducer is derived the model to be the engineering. The mechanism of the problem occurrence is examined through a parametric research about an each influence factor(Load). Lastly, the results of this study propose the model to be improved.