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박진순(Park Jin Soon) 순천향대학교 이순신연구소 2016 이순신연구논총 Vol.- No.26
본고는 명량해역에서 조류에너지 실용화 연구를 위한 연구의 일환으로 조사되었던 해양특성자료를 분석, 정리하여 울돌목 해역의 지형, 조석 및 조류 특성을 파악하였고, 이를 토대로 명량해전 당시의 조석, 조류를 예보하여 명량해전 당시의 상황을 재구성하였다. 울돌목 해역의 복잡한 해저 지형과 퇴적층이 발달하지 않는 원인은 1) 지리적 특성, 2) 퇴적물 공급원 부재, 3) 퇴적역학적으로 해류속도와 퇴적물 입도 크기의 상관관계에 따른 침식작용, 4) 오랜 기간 동안 빠른 유속의 수괴와 해저암반과의 마찰작용으로 인해 계속적인 침식이 발생하여 해저 기반암이 해저면 위로 노출된 것으로 보인다. 명량수도 양단의 약 1시간 40분 정도 조시차로 인하여 명량수도 양단에서 대조 시 해수면 높이 차이가 약 0.9m 정도가 나타나고 이로 인하여 울돌목 협수로에서 강한 유속이 나타나는 것으로 조사되었다. 명량해전 당시의 상황을 재구성한 결과, 이순신 장군은 울돌목의 조류의 세기와 주기를 예상하고, 우수영 앞바다에서 전투를 시작하여 최대한 일본군의 서해진입을 차단한 후 썰물 때 총공격을 감행하여 적군을 격퇴한 것을 추정할 수 있었다. In this study, we have identified the characteristics of the submarine topography, tide and tidal current in the Uldolmok by observing the data obtained from the study of the development of utilization technique for tidal current energy. Based on this, the tide and tidal current were predicted, and the situation of the Myeongnyang naval battle was reconstructed. The reason why there are complicated undersea features and no sediments in the Uldolmok area is 1) geographical characteristics, 2) absence of the sediment source, 3) erosion due to sedimentation mechanically correlated with the velocity of the current and sediment particle size and 4) exposure of submarine bedrock due to erosion at high velocity for long periods. A tidal phase difference of about 1 hour and 40 minutes occurs on the Myeongnyang channel, which causes the sea level difference of about 0.9m at both ends of the channel. Therefore, a strong tidal current was appeared in the Uldolmok. As a result of reconstructing the situation of Myeongnyang naval battle, we can be estimated that the Admiral Yi Sun-sin would anticipate the intensity and cycle of Uldolmok’s tidal current and cut off the entrance of the Japanese army.
다양한 조류 환경 및 경계 조건에 따른 모노파일형 해상구조물의 동특성 변화 분석
정병진(Byung-Jin Jung),박종웅(Jong-Woong Park),이진학(Jin-Hak Yi),박진순(Jin-Soon Park) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.4
Because a change in the natural frequencies of a structure indicates structural health problems, monitoring the natural frequencies crucial. Long-term measurement for the Uldolmok tidal current power plant structure has shown that its natural frequencies fluctuate with a constant cycle twice a day. In this study, lab-scale tests to investigate the causes of these natural frequency fluctuations were carried out in a circulating water channel. Three independent variables in the tests that could affect the fluctuation of the natural frequencies were the water level, current velocity, and boundary condition between the specimen and the bottom of the circulating water channel. The experimental results were verified with numerical ones using ABAQUS. It was found that the fluctuation of the natural frequencies was governed by a decrease in stiffness due to the boundary condition much more than the effect of added mass. In addition, it was found that the natural frequency would decrease with an increase in the tidal current velocity because of its nonlinearity when the boundary condition was severely deteriorated due to damage.
박준석(Jun-Seok Park),박진순(Jin-Soon Park),오영민(Young-Min Oh),김 응(Eung Kim),김동국(Dong-Guk Kim),최진용(Jin-Yong Choi),박광순(Kwang-Soon Park) 한국연안방재학회 2015 한국연안방재학회지 Vol.2 No.1
Departing Incheon port heading for Jeju Island, 6,825-ton the ferry, Sewol sank about 1.5 miles away from the North Sea in Byeongpung Island, Jindo-gun, Jeollanam-do at 8:48 a.m. on April 16, 2014. Right after the accident, Navy, National Emergency Management Agency, Coast Guard, and private divers were entered to save survivors and the missing underwater. However, 172 people were saved out of 476 people on board and 295 people died as of November 11, 2014. 9 people were missing. At the initial stage of rescue operation, for diving works, the data on tides (West Geocha Island) and currents (Maenggol Channel) were used. There were many difficulties encountered in the initial search operation as forecast location and ferry sinking point do not match, producing a lot of differences in the slack time and the velocity. Therefore, Korea Institute of Ocean Science & Technology(KIOST) installed ADCP (Acoustic Doppler Current Profiler) to observe real-time tidal current for 202 days from April 23 to November10 from the missing support barge for search operations. Analyzing the data, the trends of water speed, direction, flow, etc. were identified. The real-time tidal current data and analyzed findings were offered to divers and relevant agencies on site and effective search was supported. As a result of analyzing the observed data, slack time after flood tide was similar to that on broadcast for Maengol Channel at Sewol sinking point but slack time after ebb tide appeared average about 50 minutes in advance from the sinking point (based of July, 2014). In particular, at slack time after ebb tide, under 0.5m/s current velocity for divingpossible didn’t appear but lasting time appeared very short. On the other hand, at slack time after flood tide, the retention time for current velocity under 0.5m/s was long. From time to time, it lasted more than three hours. Besides, ebb tide started. In about two hours, short-cycle tidal current variability appeared. It is considered it was caused by geographical impact, in other words, the impact of Geocha Island, Maenggol Channel, Geocha Channel, etc. Such results were also found in the numerical model results for the relevant areas.
울돌목 조류발전소 설치용 1MW 발전설비 시제품 제어특성
박정우(Park, Jung-Woo),이기욱(Lee, Ki-Wook),김동욱(Kim, Dong-Wook),이광수(Lee, Kwang-Soo),박진순(Park, Jin-Soon) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
We have developed electrical power train for 1MW tidal current plant which is composed of both 500kW tidal current plant with doubly-fed induction generator and 500kW tidal current plant with synchronous generator. To check performances of the protype, 2MW dynamometer is used to simulate a helical turbine, and then protype generator and converter are coupled with the dynamometer separately. From the suggested experimental results it is reconfirmed that two kinds of the power train to be installed at the Uldolmok located at southwestern shore in Korea are able to operate under all kinds of the condition about speed and power.
엔코더 위치에 강인한 계통연계 기능을 갖는 권선형유도발전기 제어 기법
박정우(Park, Jung-Woo),이기욱(Lee, Ki-Wook),김동욱(Kim, Dong-Wook),이광수(Lee, Kwang-Soo),박진순(Park, Jin-Soon) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
In order to transmit energy generated through the stator winding of a doubly-fed Induct ion generator (DFIG), we need to synchronize the generated voltage vector with the grid voltage vector. However, the existing synchronization method works only when the encoder is installed at a specific Position and equivalent constant is precise. In order to solve this Problem, a new synchronization method has been proposed and a way of applying the method to existing doubly-fed induction generator control algorithm has been also proposed. The validity of the proposed methods have been verified using a prototype converter for the control of a 1.5MW-class doubly-fed induction generator