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타력 향상이 근해운송선박의 선회 성능에 미치는 영향에 관한 실험적 연구
전희철,김상현,김현준,박화평,Jun, Hee-Chul,Kim, Sang-Hyun,Kim, Hyun-Jun,Park, Hwa-Pyeong 해양환경안전학회 2012 海洋環境安全學會誌 Vol.18 No.6
안전하며 친환경적인 근해운송시스템을 확보하기 위해서는 운송 수단인 선박의 안전한 운항 확보가 필수적이다. 특히 좌초, 충돌 등의 해난사고를 방지하기 위해서는 선박이 우수한 조종성능을 갖는 것이 요구되며 특히 조종성능 중에서 선회성능은 충돌 회피 등에 필수적인 성능이다. 본 연구에서는 선박에 부착된 조타기의 타력 증가가 선박의 선회성능에 미치는 영향을 모형선 실험을 통하여 고찰하였다. 먼저 Coanda 효과를 이용한 고 양력 타 장치 모형과 47 K PC의 모형선을 제작하였다. 또한 모형선의 선회 성능 실험을 위한 자유항주시스템을 구축하고 사각 수조에서의 타력 증가 값을 변화시켜가면서 모형선의 선회 성능을 계측하여 타력 증가에 따른 선회 성능의 변화를 평가하였다. 모형선의 선회성능 실험결과를 통해 타력 증가가 근해운송 선박의 선회 성능 향상에 효과적인 것을 확인하였다. Recently, a vessel's maneuvering performance is considered to be an important subject to secure safety at short sea shipping. Especially the high turning performance, which is required to avoid the marine pollution by the ships that was grounded, becomes more severe. In this paper, we discuss the effect of increasing rudder force on turning performance of short sea shipping ship by free running test in towing tank. First of all, we make the 47K PC model ship and high-lift rudder using Coanda effect. And we make the free running test system for the turning test in towing tank. And also we perform the turing test of 47K PC model in several changes of Coanda jet momentum and evaluate the turing performance such as advance and tactical diameter. Finally, we confirm that the increasing of rudder force is very effective to improvement of turning performance of short sea shipping ship.
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고 양력 타가 선박의 조종성능에 미치는 영향에 관한 연구
김상현,김현준,전희철,윤승배,박화평,김옥석,Kim, Sang-Hyun,Kim, Hyun-Jun,Jun, Hee-Chul,Yoon, Seung-Bae,Park, Hwa-Pyeong,Gim, Ok-Sok 해양환경안전학회 2010 海洋環境安全學會誌 Vol.16 No.4
최근 선박의 좌초 및 추돌 사고로 인한 해양오염이 심각해짐에 따라 선박의 조종성능에 대한 관심이 고조되고 있는 가운데 IMO에서는 Resolution MSC.137을 채택함으로써 조종성능에 대한 국제적인 기준이 강화되었다. 선박의 조종성능을 향상시키기 위해서는 여러 가지 방법이 있으나 본 연구에서는 타의 양적 증가가 조종성능 향상에 얼마나 기여하는지를 알아보고자 한다. 조종성능 평가 방법으로 수치 시뮬레이션을 이용하였고, 대상선형은 공시선형인 Mariner Class Vessel로 하였다. 조종성능 평가 방법은 선회 시험과 지그재그 시험을 수행하였고, 고 양력 타의 적용은 수학모델에서 타와 관련된 동유체력 미계수의 값을 양력 증가에 따라 변화 시켜 조종성능의 변화를 예측하였다. 시뮬레이션 결과, 타의 양력 증가로 인해 선회성능 개선이 예상되나, 변침성능을 저해할 가능성이 있는 것을 확인하였다. Recently, a vessel's maneuvering performance is considered to be an important subject as marine pollution from the ships that stranded on a rock becomes more severe. So, IMO(International maritime organization) has adopted Resolution MSC.l37 to enhance international standards of ship's maneuverability. There's more than one way to improve ship's maneuverability. This research focused on improving ship's maneuverability by high-lift rudder. To predict the maneuverability, the numerical simulation model was used. The evaluation of maneuverability was carried out by turning test and zig-zag test. The results obtained with these simulation showed that the high-lift rudder would be effective in improving the turning ability of the ship. But it was clarified that there Has a possibility that course changing ability night become bad through an increase of rudder lift.
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대형 조선소 타 장치 설계 프로세서 비교 및 분석에 의한 표준 타 장치 설계 프로세서 제안
김상현,김현준,전희철,윤승배,Kim, Sang-Hyun,Kim, Hyun-Jun,Jun, Hee-Chul,Yoon, Seung-Bae 대한조선학회 2010 大韓造船學會 論文集 Vol.47 No.1
Recently, a very large vessel's maneuvering performance, rudder performance and rudder design's importance is considered to be an important subject. There have been few studies on the design process of rudder device before. The aim of this paper is to investigate a design process of rudder device and to propose a generalized design process of rudder device. Firstly, we investigated the rudder device design process of Korean major shipyards. And the differences of a torque calculation method, rudder section design, maneuvering performance examination method, etc were analyzed theoretically. Secondly, the design process of rudder device was divided into concept design, initial design and detail design. In concept design, a rudder area was estimated and its validity was examined. In initial design, rudder profile and design method has been selected through rudder form determination process. And principal dimension and steering gear capacity were determined. Maneuvering performance was also examined by simulation tool. In detail design, design criteria considered in rudder initial design has been investigated thoroughly. Also a rudder torque, rudder cavitation performance and rudder structure analysis were estimated. And maneuvering performance was also examined by model test. Finally, based on the results of investigation, the design process of rudder device was generalized and proposed.
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초등학교 영어 공교육 강화를 위한 멀티미디어 활용 교수,학습 방안 연구
최수영 ( Soo Young Choi ),이지은 ( Ji Eun Lee ),전희철 ( Hee Chul Jun ) 한국멀티미디어언어교육학회 2009 멀티미디어 언어교육 Vol.12 No.1
This study is to propose the usage of multimedia English courseware to increase the effectiveness of English education in elementary schools in Korea. Implementing multimedia courseware in elementary English education has not only shown success, but also coincides with the national English curriculum in terms of linguistic and affective purposes. Applying multimedia courseware in English education has shown that it helps to increase learner motivation while it promotes self-directed learning. Moreover, using multimedia courseware in elementary English classrooms enhances reading, writing, listening and speaking skills and contributes to the integration of the four language skills development in an equal manner. This study introduces some effective multimedia CD-ROMs and web-sites that can be adopted into elementary school English education, and provide lesson plans to demonstrate how to use the programs effectively. Through providing multimedia resources and lessosn plans appropriate for elementary English classes, the researchers wish to suggest more efficient and ways of teaching and learning English in elementary level classrooms.
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