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유영호 한국마린엔지니어링학회 1999 한국마린엔지니어링학회지 Vol.23 No.5
In this paper author develops digital governor for medium speed diesel engine. The system is composed of MPU main control module RPM measuring module PWM driving module driver module for F.O. rack drive motor key pad and display module. Experiment results of speed control on 6cyl 1800pm 250kw Daewoo MAN diesel erigine were satisfied for design speci-fications and system could be developed for commercial usage after taking more experiments and endurance tests under various environments.
고액공존 과공정 Al-Si 합금의 교반응고시 미세조직변화
유영호,김도향 ( Young Ho Ryoo,Do Hyang Kim ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.5
N/A The microstructural changes during semi-solid state processing of hypereutectic Al-Si alloy has been investigated in the present study. Stirring of semi-solid slurry results in the morphological changes of the primary Si particles, i.e. from angular rod shape to near-spherical shape. Besides the spherodization of primary Si particles, the average particle size increases, especially, at much higher rate in the final stage than that in the early stage of stirring. Various microstructure characterization techniques, such as anisotropic etching, SEM imaging and ECP analysis, reveal that the spherodization of primary Si particles occurs by the combinations of the mechanisms of coalescence, fracture, and wear of the individual particles. Isothermal shearing of hypereutectic Al-Si at 580℃ shows that spherical α-Al particles are formed by the dissociation of Al-Si eutectic structure at the early stage of isothermal shearing. The spherical α-Al particles gradually grow by the mechanisms of Ostwald ripening and coalescence of the particles.
디젤기관의 속도제어를 위한 최적회전수 측정에 관한 연구
유영호 한국마린엔지니어링학회 1997 한국마린엔지니어링학회지 Vol.21 No.5
A diesel Engine rotates vibratively because of alternative explosion strokes. Traditional measurement of a diesel engine speed is carried out by measuring output voltage of FV convertor from input signals of MPU(magnetic pickup unit) or of DC tachometer. Because these measurement include also vibrative rotation of a diesel engine, an analog filter is often used to eliminate high frequency noises due to periodic explosion stroke. But by this method these high frequency noises do not eliminated effectively because noise frequencies are changed according to diesel engine speed. In this paper, author proposes a new measurement method of a diesel engine revolution which read digital signal directly from MPU and prove the utility of proposed method through the real experiment.
IMO e-Navigation SIP의 Gap 분석을 고려한 MSP 구조 연구
유영호,공길영,이보경,김대해 한국항해항만학회 2014 한국항해항만학회 학술대회논문집 Vol.2014 No.춘계
IMO는 선박의 안전항해와 해양환경보호를 위해 e-Navigation의 개념을 채택하였고 이를 위한 구체적인 전략이행계획(SIP, Strategic Implementation Plan)작업을 수행하고 있다. IALA는 IMO의 NAV의 e-Navigation 실행계획을 완성하기 위해 7개의 작업반(WG)을 운용하고 있다. e-Navigation의 개념을 구현하기 위해서는 첨단 IT 전자장비의 개발도 필요하지만 이러한 장비를 이용하여 항해안전을 향상시킬 수 있는 다양한 IT 서비스, 즉 MSP(Maritime Service Portfolio)가 필요하다. 모든 선박에서 MSP을 이용하기 위하여서는 MSP의 구조와 데이터가 표준화되어야 한다. 또한 항해안전에 효과적인가를 검증할 수 있는 방법이 제시되어야 하며, MSP가 남용되지 않도록 관리되어야 한다. 본 연구에서는 선박의 사고사례와 기존 항해통신시스템과 e-Navigation SIP의 갭 목록, 갭 분석 및 갭 해결책을 활용하여 선박의 안전과 보안에 입각한 MSP 구조에 대해서 고찰해 본다.
지식기반 퍼지 추론을 이용한 디젤기관 연소계통의 고장진단 시스템에 관한 연구
유영호,천행춘 한국마린엔지니어링학회 2003 한국마린엔지니어링학회지 Vol.27 No.1
In general many engineers can diagnose the fault condition using the abnormal ones among data monitored from a diesel engine, but they don't need the system modelling or identification for the work. They check the abnormal data and the relationship and then catch the fault condition of the engine. This paper proposes the construction of a fault diagnosis engine through malfunction data gained from the data fault detection system of neural networks for diesel generator engine, and the rule inference method to induce the rule for fuzzy inference from the malfunction data of diesel engine like a site engineer with a fuzzy system. The proposed fault diagnosis system is constructed in the sense of the Malfunction Diagnosis Engine(MDE) and Hierarchy of Malfunction Hypotheses(HMH). The system is concerned with the rule reduction method of knowledge base for related data among the various interactive data.