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이형근 ( Hyeong Geun Lee ),안영수 ( Young Su An ),박병수 ( Byung Soo Park ),장충식 ( Choong Sik Jang ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.2
This study is intended to provide navigator with specific information necessary to assist the avoidance of collision and the operation of ships to evaluate the maneuverability of dead weight tonnage 8,000 tons Oil/Chemical tanker. The actual maneuvering characteristics of ship can be adequately judged from the results of typical ship trials. Author carried out sea trials based full scale for turning test in ballast condition and full load condition, semi balanced rudder and flap rudder. The turning circle maneuvering were performed on the starboard and port sides with 35˚ rudder angle at the normal continuous rating. The results from tests could be compared directly with the standards of maneuverability of IMO and consequently the maneuvering qualities of the ship is full satisfied with its.
내경 플라즈마 용사법에 의한 과공정 Al-Si 합금의 실린더 블록 보어 개발을 위한 기초연구
김병희,이형근,김혜성,Kim, Byeong-Hui,Lee, Hyeong-Geun,Kim, Hye-Seong 한국재료학회 2001 한국재료학회지 Vol.11 No.11
The objective of this study is to investigate the characteristics - microstructure, hardness, adhesive strength and friction coefficient - of the coatings with aging - treatment after optimizing internal- plasma spraying parameters for Al-30wt%Si powder as a basic research to manufacture the cylinder block bore for Al engine composed of Al-30wt%Si alloy on Al alloy, The optimum internal-plasma spraying parameters of Al-30wt%Si alloy are summarized as follows: voltage: 37.5V, current: 160A, working distance: 25mm, gun traverse speed: 4.5mm/s, rotating speed: 518m/min. The primary Si particles grew aggressively with increasing heat-treating temperature. The hardness of the as-sprayed coating was about Hv=275 but this value was abruptly decreased with increasing heat-treating temperature. And average friction coefficient of the coating was below 0.08 after heat treatment for 48h at $175^{\circ}C$.
실선시험에 의한 DWT 8,000톤 선박의 조종성능 - Semi-balanced rudder and flap rudder -
안영수 ( Young Su An ),이형근 ( Hyeong Geun Lee ),박병수 ( Byung Soo Park ),장충식 ( Choong Sik Jang ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.2
This study is intended to provide navigator with specific information necessary to assist the avoidance of collision and the operation of ships to evaluate the maneuverability of dead weight tonnage 8,000 tons Oil/Chemical tanker. The actual maneuvering characteristics of ship can be adequately judged from the results of typical ship trials. Author carried out sea trials based full scale for turning test, Z” maneuvering test, man overboard rescue maneuver test, inertia stopping test. Consequently, 2st Overshoot yaw angle of the semi balanced rudder and flap rudder in ±20° zig.zag test showed 22.2° and 18.0°, respectively. The maneuverability of the vessel was good in the flap rudder. The man overboard rescue maneuver maneuverability test was most favorable in the flap rudder and the full load condition. The results from tests could be compared directly with the standards of maneuverability of IMO and consequently the maneuvering qualities of the ship is full satisfied with its.