• Journal of the KSME
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• v.43 no.1
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• pp.66-77
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• 2003

• Bulletin of the Society of Naval Architects of Korea
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• v.39 no.4
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• pp.70-96
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• 2002

• Journal of Advanced Marine Engineering and Technology
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• v.26 no.5
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• pp.512-525
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• 2002

• Bulletin of the Society of Naval Architects of Korea
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• v.31 no.3
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• pp.16-20
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• 1994

본 고에서는 진동관점에서 특히 문제시되고 있는 장행정.소수실린더.저속 2행정 디젤주기관의 기진력 발생기구와 기관본체진동에 대하여 살펴보고, 박용디젤 추진축계의 진동문제와 관련해 서는 1980년 이후부터 본격적으로 시작된 국내의 연구사례들을 중심으로 이 분야에 대한 연구 현황을 소개하고 향후 중심적으로 연구해야 할 문제점들을 검토하고자 한다.

• Journal of Advanced Marine Engineering and Technology
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• v.33 no.8
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• pp.1100-1106
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• 2009

Recently, there are quite a lot of attention is drown on the researches related to of Miller method applied high expansion cycle. For this study, high expansion cycles are formed and analyzed with the base view point of thermodynamics, and the features of each factors are also investigated. As a result of analysis, the expansion-compression ratio is expected with a decrease of effective compression ratio as intake valve closing time retarded, however, the decrease of mean effective pressure and its output is accompanied with the counterflow of intake air. Accordingly, as the consequence of such failure, it is expected that an alternative is needed for the realization of high expansion cycles, and the improvement over thermal efficiency. To materialize such cycle, the control system to delay the closing time of intake valve was designed and VVT, the 3 S/B low speed diesel engine, is applied to evaluate the efficiency. The result of the trial shows that there was no significant errors.

• Journal of Advanced Marine Engineering and Technology
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• v.35 no.8
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• pp.1009-1015
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• 2011

In this study, in the high expansion cycle was conduced by variable valve timing system composition to close intake valve late, and in the intake air reduction on the low compression was solved by supercharging pressure. In this wise, by constituting Diesel-Atkinson cycle, this study looked into a possibility of thermal efficiency improvement. As a result, there was improvement in thermal efficiency and output in a whole range of closing timing from ABDC $40^{\circ}$ to ABDC $80^{\circ}$. However, after ABDC $70^{\circ}$ of closing timing, the thermal efficiency increase was getting smaller. As the result of the study, the optimum intake valve closing timing was about ABDC $70^{\circ}$, high loading territory of engine was more effective than low loading territory, and engine operation in middle loading territory was stable. At this time, brake thermal efficiency was 12.5% higher than ordinary engine on average.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2005.11a
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• pp.11-12
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• 2005

BMS & Governor System은 선박용 추진 기관으로 사용되는 저속 디젤 엔진의 원격 운전 및 제어를 담당하는 시스템으로 선박 추진과 엔진 제어에 필수적인 중요 구성 요소이며, 조선 기자재관련 고부가가치 산업의 한 부분이다. 그러나 조선관련 산업에 있어서 세계 최강국의 위상에 걸맞지 않게 국내에는 BMS & Governor System의 독자 모델이 없는 실정이고, 유럽이나 일본의 제품으로 전량 수입에 의존하고 있는 상황이다. 이에 선박 추진용 저속 디젤 엔진을 위한 제어 시스템의 관련 기술을 연구하여, SEA-CAPS를 개발하였다. 본 연구에서는 BMS & Governor System에 대한 개요와 SEA-CAPS의 개발 내용, 그리고 환경 및 성능 시험에 관한 내용을 언급하고자 한다.

• Journal of Advanced Marine Engineering and Technology
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• v.15 no.3
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• pp.21-30
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• 1991

• Transactions of the Korean hydrogen and new energy society
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• v.24 no.5
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• pp.461-466
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• 2013

In this research, the diesel cycle was thermodynamically interpreted to evaluate the possibility of high efficiency by converting diesel engine to the atkinson cycle, and general cycle features were analyzed after comparing these two cycles. That an experimental single cylinder and a long stroke diesel-atkinson engine, of which S/B ratio was more than 3, were manufactured. After evaluating the engine through basic experiments, a diesel engine was converted into the atkinson cycle by constituent VCR (variable compression ratio) device and VVT (variable valve timing) system. The experimental method was to observe compression work reduction effects due to low compression effects from delayed intake valve closing of the early stage atkinson engine. The result, the possibility of increasing compression ratio about each engine load was confirmation by constructing compensate expansion-compression ratio in accordance with the delayed intake valve close.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2000.05a
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• pp.36-44
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• 2000

In his study the simulation was carried out by simplifing and modeling dividing into fuel injectioin pump high pressure pipe and fuel injection valve in the fuel injection system of a low speed marine diesel engine. A computer simulation model was developed using the method of characteristics to analyze the unsteady flow in the fuel injection system considering cavitation and variation of fuel density and bulk modulus. Comparison was commenced between the calculated data and experimental data of pressure and injection quantity at the high pressure distributor in fuel injection system for the training ship "M/V hanara" the effects of the high pressure pipe length diameter plunger diameter nozzle openning pressure were also investigated by simulating results.g results.