• 수산해양기술연구
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• 제22권2호
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• pp.22-30
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• 1986

It is very important for a navigator on bridge to know the maneuverability of his ship sufficiently at sea. Generally, the data of a turning circle test have long been used to study and evaluate the maneuverability of a ship. But referring only the data of the turning circle test method, he can not evaluate his ship's maneuvering characteristics sufficiently. So nowaday the test method added Z test to turning circle test for more detail references is considered to be desirable. In this paper, the authors performed PAL test and Z test together in order to study the maneuverability of M. S.Pusan 403, training ship of the National Fisheries University of Pusan. According to the results of PAL test, the rudder effect in port rudder angle of the M. S. Pusan 403 was found to be more effective than that in starboard one, because her changing amounts of angular velocity, turning radius and tangent speed in port rudder angles were found to be larger than those of them in starboard rudder one in unsymmetry. The relation between her drift angle(.8) and rudder angle (0) was found to be changing with .8=0.640 in direct proportion. As it appeared that her calculated K'-values were smaller than the standard K'-values of different kinds of ships in accordance with her Z test, her turning ability was found to be lower. The running distance of a turn in her 10$^{\circ}$ Z test was about 8.3 times her own length and was found not to be exceeded the standard maneuvering distance, therefore she was considered to have good maneuverabilities synthetically.

• 수산해양기술연구
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• 제25권2호
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• pp.70-74
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• 1989

실험선 제주 402호의 조종성능을 전속전진중 최대타각으로 전타한 때의 선회권측정과 $10^{\circ}$, 20$^{\circ}$, 30$^{\circ}$Z시험에서 산출된 조종성지수를 분석, 검토한 결과를 요약하면 다음과 같다. 1. 선회종거는 우현선회시가 79.1m로 배의 길이의 약 2.6배였으며, 좌현선회시는 81.4m로서 배의 길이의 약 2.7배였다. 또, 선회경은 배의 길이의 약 2.6배로서 우현선회시가 78.3m로서 좌현선회시 80.4m보다 작았다. 2. 선회권시험시 속력저감율은 0.49였으며, 평균선회각속도는 우현선회시가 4.3$^{\circ}$/sec, 좌현선회시는 4$^{\circ}$/sec이었다. 3. Z시험 결과 over shot angle은 우현전타시가 좌현전타시보다 더 컸으며, 좌우타전타시의 평균값은 $10^{\circ}$Z시험시가 10.5$^{\circ}$, 20$^{\circ}$Z시험시가 20.5$^{\circ}$, 30$^{\circ}$Z시험시가 29.5$^{\circ}$로 다소 큰 편이었다. 4. $10^{\circ}$, 20$^{\circ}$, 30$^{\circ}$Z시험에서 K' 및 T'의 값은 각각 0.755, 0.566, 0.481 및 3.468, 1.621, 1.547로서 대체적으로 선회성은 대각도 전타 일수록 나쁘거나, 추종성은 대각도 전타 일 수 록 좋았다.

• 수산해양기술연구
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• 제46권1호
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• pp.56-69
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• 2010

This study was intended to determine the maneuverability of the vessel CHARMBADA. When the rudder angle was at $10^{\circ}$, $20^{\circ}$ and $30^{\circ}$, the maximum advance by slow, half and full ahead were varied in the range of 523.6-131.3m, 528.8-177.2m and 530.6-219.7m, respectively. The maximum transfer was 799.9-181.3m, 792.1-232.8m and 807.7-316.9m, respectively. The turning circle ability was better during starboard turning. When the rudder angle was $10^{\circ}$, $20^{\circ}$ and $30^{\circ}$, variation in the maximum advances was 392.0m, 245.0m and 153.0m. The maximum transfer was 528.0m, 339.0m and 218.0m, respectively based on the regression equations. As the rudder angle became bigger, the maximum advance or maximum transfer became smaller by the exponential function. The advance inertia took 127sec, 145sec, 181sec each until the vessel speed was 7.0konts, 12.0konts, 17.0konts. The static inertia took 245sec, 269sec, 300sec each until the vessel speed was under 2.0konts and the advance distance was 114.4m, 181.2m, 197.0m each. Accordingly, the static inertia was inclined to increase to scale according to the increase in vessel speed. For the CHARMBADA, the smaller the rudder angle was, the much bigger the turning circle became due to adhesion to the skeg, thereby lowering the vessel's turning ability.

• 수산해양기술연구
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• 제37권4호
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• pp.275-284
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• 2001

본 연구에서는 제주대학교 실습선 아라호(G/T : 990tons)의 조종 성능을 파악하기 위하여 2000년 8월과 2001년 5월에 2회에 걸쳐 제주항 북방 3마일 해상에서 조타에 의한 선회성과 추종성 등의 조종성능을 실시한 결과는 다음과 같다. 1. 부표 방위반법으로 측정한 선회권의 크기에서 선회종거는 우현선회시가 198m, 좌현선회시가 192m로서 좌현선회시가 우현선회시보다 6m 작았으며, 또한, 선회경의 크기는 우현선회시가 194m, 좌현선회시가 188m로서 좌현선회시가 우현선회시 보다 6m 작았다. 2. DGPS 측위에 의한 선회권의 크기에서 선회종거는 우현선회시가 196m, 좌현선회시가 194m로서 좌현선회시가 우현선회시보다 2m 작았다. 또한, 선회경의 크기는 우현선회시가 194m, 좌현선회시 190m로서 좌현선회시가 우현선회시보다 4m 작았다. 3. 신조 시운전시 부표 방위반법에 의해 측정한 선회권의 크기와 2001년 5월에 DGPS 측위에 의하여 측정한 선회권의 크기를 비교해 본 결과, 선회종거는 DGPS 측위에 의한 선회권이 신조시운전시 선회종거보다 우현선회시가 1m 컸으며, 좌현선회시가 21m 작았다. 또한, 선회경의 크기는 우현선회시 16m, 좌현선회시 23m 작았다. 4. 선속 13k't로 전속 전진중 타각 $35^\circ$로 좌현 또는 우현으로 전타 했을 때 선회각 $180^\circ$에서 선속이 7.8k't이고 $360^\circ$선회시는 6.0k't가 되었으며, 소요 시간은 좌현선회시가 150초, 우현선회시가 156sec로 좌현선회시가 우현선회시보다 6초 짧았으며, 선회평균 각속도는 좌현선회시가 $2.4^\circ$/sec, 우현선회시가 $2.3^\circ$/sec였다. 5. 타각 $10^\circ$, $20^\circ$, $30^\circ$ Z시험에서 선회성지수 K와 추종성지수 T는 각 각 선회성지수는 1.24, 1.45, 1.65였으며, 추종성지수는 각 각 0.33, 0.20, 0.14가 되어 $30^\circ$인 경우가 $10^\circ$, $20^\circ$ Z시험에서 보다 선회성지수 K는 크고, 추종성지수 T는 작아서 대각도 조타일 때가 소각도 조타일 때 보다 조종성능이 양호하였다.

• 수산해양기술연구
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• 제28권1호
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• pp.21-26
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• 1992

Generally a navigator evaluated the maneuverability of his ship by the scale of turning circle which was described only by the largest rudder angle of the port and starboard sides. But to have the sufficient knowledge of his ship's maneuvering characteristics he should consider the data about the new course keeping test, the spiral test, and the turning circle tests in accordance with the rudder angles together. In this paper the author performed the above tests to study the maneuverability of the stern trawler M.S. Pusan 404 which is a training ship of the National Fisheries University of Pusan. The obtained results are summarized as follows: 1. When the rudder angles being 5。, 10。, 20。, 30。, 35。 the advances of the starboard side turning circles were 12.8, 8.2, 4.8, 2.9, 2.7 times as large as the length of the ship, and of the port side turning circles were 13.3, 8.7, 5.4, 3.5, 2.9, time as large as the large as it. Under the same conditions the tactical diameters were 15.1, 9.7, 5.2, 3.1, 2.8 times as large as the length of the ship, for starboard side, and 17.2, 12.4, 6.4, 3.7, 3.2 times as large as it for port side. 2. As the rudder angle being increased the ratio of the advance to the tactical diameter was nearly 1 and her obeying ability was better than that of the small angle. 3. The mean values of the rates of speed reduction during the steady turning motion were 0.96, 0.92, 0.82, 0.71, 0.65 in accordance with the rudder angles. 4. The relative formulas between the distance to the new course y and the altering course x were as follows: When rudder angles being 10。, 20。, 30。, y=52.2222+1.6133x, y=48.750+0.9383x, y=39.250+0.655x respectively. 5. There was little difference of the distance to the new course between rudder angle 20。and 30。, and so it is desirable for a navigator to a navigator to use the small rudder angles unless sudden emergencies. 6. Though her rudder angle being small her course stability was good according to the spiral tests.