연구조사선 제라호의 조종성능 평가에 관한 연구

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 sea trials based full scale for turning test, zig-zag test, spiral test at actual sea-going condition and which were performed on starboard and port sides with 10°-20° rudder angle at service speed 10knots. The turn circle was much difference both of the turning of port and starboard which was more longer starboard than port. In the Zig-zag test results, When the port and starboard was 10° the 1st and 2nd overshoot angles were 6.0°, 5.8° and 6.3°, 7.1° respectively and the 1st overshoot angle were 16.4°, 17.6° when using 20°. Her maneuverability index and  can be easily determined by using an analogue computer with the data obtained from Zig-zag tests where  is a constant representing the turning ability and  is a constant representing her quick response. In the Zig-zag tests under 10° or 20° at rudder angle, the authors obtained the value which is 0.149. 0.123 sec- and  is 11.853, 6.193sec and angular velocity is 0.937°/sec, 1.636°/sec. In the spiral test, the loop width was unstable at +0.51° and -1.19° around the midship of rudder, but the tangent line at 0° was close to vertical. From the sea trial results, we are found that did comply with the present criterion in the standards of maneuverability of IMO.