• 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.

• Proceedings of KOSOMES biannual meeting
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• 2006.05a
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• pp.213-216
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• 2006

In this paper a development of shaft power measuring system for a small vessel is discussed. It is important that the exact power measurement of marine engine which is used for ship's propulsion since the engine power is related to ship's usage and its shaft design. Two gearwheel and magnetic sensors are adopted to measure torsional angle on the shaft. High resolution encoder is also applied to compensate the output signal from gearwheel. The calculation of shaft power is executed using measured signal and angular velocity of rotating machine and the result is plotted on the monitoring screen.

• Journal of Korea Ship Safrty Technology Authority
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• s.27
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• pp.37-52
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• 2009

본 연구에서는 소형 선박을 대상으로 축계에서의 정확한 출력을 측정하기 위한 시스템을 제안하고, 그에 대한 개발방법에 대하여 논의하고자 한다. 일반적으로 선박에 탑재되는 엔진은 선박의 사용 목적, 선박 크기 및 선속 등의 설계 사항에 맞추어 결정된다. 따라서 엔진으로부터 프로펠러에 전달되는 동력 즉, 엔진의 출력을 정확하게 검출하는 것은 설계된 선박이 본래의 설계 목적을 만족시킬 수 있는 지에 대한 판단근거로 활용되는 중요한 작업이라 할 수 있다. 실제로 엔진 출력산정에 관한 자료는 정확하게 제시되어야하며 본 연구에서는 실제 엔진을 회전기기로 가정하고, 전동기로 대체한 회전기기의 출력측정시스템을 개발하고자 한다. 선박용 엔진, 압축기, 전동기 등은 구동 동력원에 약간의 차이가 있지만 회전에 의한 동력전달방식은 큰 차이가 없다고 볼 수 있다. 따라서 본 연구에서 제안한 동력측정 방법은 다양한 종류의 회전기기에 폭넓게 적용할 수 있을 것이다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.10a
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• pp.697-698
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• 2013

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2006.06a
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• pp.3-4
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• 2006

In this paper, a development of shaft power measuring system for a rotating machinery is discussed. It is important that the exact power measurement of marine engine since the engine power is related to ship's usage and its shaft design. The engine equipped on the ship is assumed to rotating machine which can generate mechanical power by electrical energy. Two gearwheel and magnetic sensors are applied to measure torsional angle on the shaft. High resolution encoder is also applied to compensate the output signal from gearwheel. The calculation of shaft power is executed using measured signal and angular velocity of rotating machine.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.19 no.1
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• pp.64-75
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• 2009

The shipbuilder's requirement for a higher power output rating has led to the development of a super large two stroke low speed diesel engines. Usually a large-sized bore engine ranging from $8{\sim}14$ cylinders, this engine group is capable of delivering power output of more than 100,000 bhp at maximum continuous rating(mcr). Other positive aspects of this engine type include higher thermal efficiency, reliability, durability and mobility. This plays a vital role in meeting the propulsion requirement of vessels, specifically for large container ships, of which speed is a primary concern to become more competitive. Consequently, this also resulted in the modification of engine parameters and new component designs to meet the consequential higher mean effective pressure and higher maximum combustion pressure. Even though the fundamental excitation mechanisms unchanged, torsional vibration stresses in the propulsion shafting are subsequently perceived to be higher. As such, one important viewpoint in the initial engine design is the resulting vibration characteristic expected to prevail on the propulsion shafting system(PSS). This paper investigated the torsional vibration characteristics of these super large engines. For the two node torsional vibration with a nodal point on the crankshaft, a tuning damper is necessary to reduce the torsional stresses on the crankshaft. Hence, the tuning torsional vibration damper design and compatibility to the shafting system was similarly reviewed and analyzed.