• Journal of Advanced Marine Engineering and Technology
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• v.39 no.1
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• pp.28-31
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• 2015

Electromotive forces (EMF) are generated by electrical equipment and engine shafting with a number of reasons. The shaft and bearing which is insulated by lubricating oil acts as a condenser, being able to store this EMFs. The electromotive force on the hull and shaft, with very few exceptions, has anode voltage on it. Electrical spark of the anode voltage on the shaft may lead to corrosion. Hence, in order to prevent ship's shaft and propeller corrosion, shaft grounding system are installed and operated. The shaft EMF voltage measurement methods was measured using 24bit 2 channels A/D converter of NI company and Labview software. 1 channel was propeller shaft's voltage and the other was M/E engine rpm gauge. In this paper, the generated electromotive force was analyzed and modeled with result of the analysis. As a result, the main shaft's electromotive force was in direct proportion to the main engine's revolution. However, over the specific R.P.M., it was reduced gradually. In addition, higher electromotive force on the shaft was identified during engine's ahead direction than the astern direction. The generated electromotive force is only minor compared to the shaft grounding system.

• Journal of the Korean Society of Marine Environment & Safety
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• v.28 no.1
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• pp.135-140
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• 2022

Most machines are made of several types of . In particular, the shaft system of the ship consists of the brass of the propeller blade and the stainless steel of the shaft. When dissimilar the electrolyte solution of seawater, a voltaic cell and a shaft electromotive force is generated. This electromotive force causes electrical corrosion of the bearing and shaft supporting the shaft system. prevent this corrosion, a shaft grounding system is installed in ships. As for the experimental method, various information acquired by designing a program to periodically measure the electromotive force of the controllable pitchpropeller) system using an A/D converter of NI. This study analyzed the generation and characteristics of accumulator electromotive force for CPP and considered the installation location of the grounding system to remove the accumulator electromotive force.

• Proceedings of the KAIS Fall Conference
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• 2012.05b
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• pp.516-519
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• 2012

산업 현장에 필수적으로 사용하는 유틸리티 시스템(Utility System)의 하나인 에어를 생산하는 공기압 축기의 운전방식은 조작 패널부에 사용자가 설정한 셋팅값에 의해 내부의 밸브를 제어하여 로딩 및 언로딩 운전을 한다. 이로 인해 대용량(100HP, 200HP)의 공기압축기를 여러대 사용하는 수용가에서는 연속 다발적인 운전으로 인한 전력 사용량의 변동으로 역률 저하 및 연속가동으로 인한 설비 과부하 및 내부 기계 베어링 피로도 증가 및 파손 등 고장이 발생되는 문제점이 있다. 따라서 본 논문에서는 인공 신경회로망(ANN:Artificial Neural Network)을 이용하여 최적의 에너지 운용 알고리즘을 제안하여 실계통의 문제점을 분석하여 개선하고자 한다.