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운항실습선에 적용한 CO<sub>2</sub> 배출량 저감대책
이상득,고대권,정석호,Lee, Sang-Deuk,Koh, Dae-Kwon,Jung, Suk-Ho 한국마린엔지니어링학회 2015 한국마린엔지니어링학회지 Vol.39 No.9
지구온난화에 대한 심각성이 대두되면서 선박부문의 온실가스 배출에 관한 연구가 전 세계적으로 활발하게 진행되고 있다. 이에 반하여 국내 연구 수준은 기초에 그치고 있다. 본 논문에서는 선박으로부터 배출되는 이산화탄소의 여러가지 저감대책 중에서 운항손실과 투자비용을 최소화하면서 수행할 수 있는 방법으로 전자제어엔진 사용, 트림 최적화, 프로펠러 연마 및 친환경 방오도료의 사용을 선정하였다. 선정된 저감대책들을 운항실습선에 적용하여 시험 운항을 실시하였고 연료소비율에 미치는 영향을 분석하였다. 그 결과, 각 대책들은 약 1~5%의 연료소비율 저감 효과가 있었고 이를 에너지효율운항지수 산출에 적용하면 약 1~5%를 감소시키는 것을 알 수 있었다. 향후 국제적 환경규제를 제정할 때 우리나라에게 유리하도록 대응하기 위해서는 에너지효율운항지수에 대한 연구에도 지속적인 노력이 필요하다고 사료된다. As the seriousness of global environment pollution is gaining increasing public attention, research into greenhouse gas emissions of ships is being carried out globally. At a domestic level, however, in a number of significant fields such research has not been conducted to date. This study examined countermeasures for the reduction of $CO_2$ emission in the fields of electronic control engines, trim optimization, propeller polishing, hull cleaning, and anti-fouling paint using an actual sea-going vessel. Selected countermeasures were applied during sea trials of the ship and the effect of specific fuel oil consumption analyzed. It was found that each countermeasure resulted in a decrease of fuel consumption of 1~5%. The energy efficiency operational indicator (EEOI) was calculated and found to also be improved by 1~5%. Further research into the EEOI of domestic shipping is planned to enhance conformance with international environmental regulations and improve global competitiveness.
장지성(Ji-Seong JANG),고대권(Dae-Kwon Koh),김영복(Young-Bok Kim) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this study, a robust controller to control pressure in a pneumatic pressure vessel with a long transmission line is proposed. Frequency response of transmission line using compressible fluid is changed by the flowing state of the fluid. So, if a fixed gain controller designed based on a model supposed the flowing state to a specific state, the performance of the control system could be degraded because of the modelling error. The controller designed in this study is composed of two parts. One is a feedback controller to improve a feedback characteristics and to compensate the influence of the variation of transfer characteristics of a transmission line owing to the change of flowing state and the other is a feedforward controller to regulate command following performance. The experimental results with the designed controller show that the robustness of the control system is achieved regardless of the change of the model of the transmission line. Therefore, the designed controller can be utilized for the performance improvement of a pressure control system with a long transmission line using compressible fluid.