Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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A study on maneuverability evaluation by the research vessel JERA

조사선 제라호의 조종성능 평가에 관한 연구

  • LEE, Chang-Heon (Department of Marine Industrial and Maritime Police, Jeju National University) ;
  • AHN, Jang-Young (Department of Marine Industrial and Maritime Police, Jeju National University) ;
  • KIM, Suk-Jong (Department of Marine Industrial and Maritime Police, Jeju National University) ;
  • KIM, Min-Son (Division of Marine Industry Transportation Science and Technology Marine Production System Major, Kunsan National University) ;
  • CHOI, Chan-Moon (Department of Marine Industrial and Maritime Police, Jeju National University)
  • 이창헌 (제주대학교 해양산업경찰학과) ;
  • 안장영 (제주대학교 해양산업경찰학과) ;
  • 김석종 (제주대학교 해양산업경찰학과) ;
  • 김민선 (군산대학교 해양산업.운송과학기술학부 해양생산시스템전공) ;
  • 최찬문 (제주대학교 해양산업경찰학과)
  • Received : 2017.03.17
  • Accepted : 2017.05.10
  • Published : 2017.05.31
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Abstract

This study is intended to provide navigator with specific information necessary to assist in the avoidance of collision and in operation of ships to evaluate the maneuverability of research vessel Jera. Authors carried out full-scale sea trials for turning test, zig-zag test, and spiral test at actual sea-going condition, which were performed on starboard and port sides with 10-20 rudder angle at service speed of 10 knots. The turning circle was much different at both of the turning of port and starboard which was longer at the starboard than at the port. In the zig-zag test results, the port and starboard was $10^{\circ}$ the first and second overshoot angles were $6.0^{\circ}$, $5.8^{\circ}$ and $6.3^{\circ}$, $7.1^{\circ}$ respectively and the first overshoot angles were $16.4^{\circ}$, $17.6^{\circ}$ when using $20^{\circ}$. Her maneuverability index T and N can be easily determined by using an analogue computer with the data obtained from the zig-zag tests where K is a constant representing the turning ability and T is a constant representing her quick response. In the zig-zag tests under $10^{\circ}$ or $20^{\circ}$ at rudder angle, the value K is 0.149. 0.123 sec- and T is 11.853 and 6.193 sec and angular velocity is $0.937^{\circ}/sec$ and $1.636^{\circ}/sec$. In the spiral test, the loop width was unstable at $+0.51^{\circ}$ and $-1.19^{\circ}$ around the midship of rudder, but the tangent line at $0^{\circ}$ was close to vertical. From the sea trial results, we found that she did comply with the present criterion in the standards of maneuverability of IMO.

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References

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