A study on the manoeuvrability of T/S SAEBADA by real sea trials

Transcription

1 J. Kor. Soc. Fish. Tech. 4(4), 89 95, 005, 4(4), 89 95, 005 * A study on the manoeuvrability of T/S SAEBADA by real sea trials Young -Su AN, Il-Kwon KANG *, Hyung-seok KIM, Jung-Chang Kim, Min-Seok Kim 3, Hyo-Jae JO 4 and Chun-ki LEE 4 Institute of Marine industry, Gyeong Sang National University, Tong yong , Korea Department of Marine Production System Engineering, Pukyong National University, Busan , Korea Department of Oceanography, Pukyong National University, Busan , Korea 3 Training ship, Pukyong National University, Busan , Korea 4 Division of Ocean System Engineering, Korea Maritime University, Busan , Korea 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 manoeuvrability of own ship. The actual manoeuvering characteristics of ship can be adequately judged from the results of typical ship trials manoeuvres. Author carried out sea trials based full scale for turning test, zig-zag test, spiral tests and crash-stop test at actual sea going condition. The turning circle manoeuvres were performed on starboard and port sides with 35 rudder angle at the service speed, and Zig-zag procedures were performed on both sides with 0 and 0 rudder angle respectively. Spiral tests were carried out on the both sides and crash stop test was also carried out. The results from tests could be compared directly with the standards of manoeuverability of IMO and consequently the manoeuvring qualities of the ship is fully satisfied with its. Key word : Advance, Transfer, Tactical Diameter, Turning test, Zig-zag test, Spiral tests, Crash stop test, Manoeuvrability. (Safe way, 004). human factor. *Corresponding author : ikkang@pknu.ac.kr Tel: Fax:

2 (Kijima, 995).,,, IMO. human factor. human factor,,... sea trial,. sea trial light condition. (Yasukawa, H.,99, Kobayashi, H., 995).,,.. condition, zig zag, spiral, IMO ( 34 46, 8 39 ), turning, zig zag, spiral crash stop.,,. Turning, ( ) (35 ), zig zag 0 0, spiral, crash stop. table, body plan Fig.. Fig. Table. Experimental conditions of T/V SAEBADA Items Specification Length Loa Lpp Breadth Gross tonnage (National) (International) Draft Fore After Displacement Metacentric height GM Cb Main engine Service speed Wind speed direction Wave height 70.6m 60.6m.3m 999 ton,358 ton 3.4m 5.0m,68 ton 0.7m 0.6 3,300HP 4.0kts.5m/sec m

3 Fig.. Body plan, bow and stern contours of hull form. Fig. 3. Turning trajectory for 35 rudder turn by the real sea trial. Fig.. Configuration of measurement system., DGPS,, /,, heading & rudder, RPM, data., zig zag, spiral.,,,,,, screw propeller, Froude Number 0.3 table.,.5m/sec. even keel,. Fig. 3 turning,., reach, advance, transfer, tactical diameter, final diameter 83m(.37L), 8m(3.00L), 88m(.45L), m(3.50l), 9m(3.5L), 86m (.4L), 80m(.97L), 86m(.4L), 3(3.5L), 74m (.87L)., final diameter.. Reach,.5L reach. Advance. IMO, advance 4.5L, tactical diameter 5L.

4 3.0L, 3.5L. tactical diameter 3 4, final diameter tactical diameter 80 85%,., Fig. 4. sec, 45%.. 86sec, 48%. 4sec. 90, 40 50%, % (Yoon, 978)... zig zag. Fig. 5 0 zig zag. +0 zig zag overshoot yaw angle 4., overshoot yaw angle 4.8, 0 zig zag overshoot yaw angle 3.8, overshoot yaw angle 4.9. Overshoot yaw angle. initial turning time +0 zig zag 5.5sec, 0 zig zag 5.sec. Fig. 6 0 zig zag. +0 zig zag 0 zig-zag test Zig zag 0 zig-zag test Fig. 4. Reduction of ship speed according to the time elapsed in the real sea trial. Fig. 5. Trace of heading and rudder angle for 0 zig-zag test.

5 overshoot yaw angle 3., overshoot yaw angle.6, 0 zig zag overshoot yaw angle.7, overshoot yaw angle Initial turning time 0 zig zag 8.sec, 0 zig zag 7.5sec. Zig zag overshoot yaw angle. IMO overshoot yaw angle 0 zig zag overshoot yaw angle 0, overshoot yaw angle 5, 0 zig zag overshoot yaw angle 5. overshoot yaw angle 0 zig zag overshoot yaw angle 4.0, overshoot yaw angle 4.9, 0 zig zag overshoot yaw angle.9 IMO 0 zig zag test.,,,, table zig zag K 0.(sec ), T 4.7(sec).,,. Zig zag K T ( 45 ) 30m. Spiral spiral, Fig. 7 spiral.,., zig zag test Fig. 6. Trace of heading and rudder angle for 0 zig zag test. Fig. 7. Trace of the ship for spiral test.

6 Crash stop astern test crash stop astern test. 4kts mim 45sec, 39m(6.5L)., 45. IMO 5L,. 4 7,, good seamanship,. 4. δ 0 x, y, x y (Yoon, 98). x (T t ) v R sin Kδ 0 t y R R cos Kδ 0 t (), T, K, R, t, t. d s. d s (T A t A ) V A R A sin K A δ 0A t A (T B t B ) V B R B sin K B δ 0B t B (), A B. 35,, 45, () reach 45. () 34m, 0.8n.mile. 0.n.mile.,.. advance, transfer, tactical diameter 3.00L,.67L, 3.50L,.97L,.60L, 3.5L, final diameter. 45%, 48%. Zig zag overshoot 0 zig zag overshoot 4.0, overshoot 4.9, 0 zig zag overshoot.9 IMO. zig zag (K) 0.(sec ), (T) 4.7(sec), ( 45 ) 30m.

7 Spiral. Crash stop astern 4.0kts 39m, min 45sec, heading n.mile. Katsuro, KIJIMA, 995. Outline of Research on Ship Manoeuvrability, nd Symposium, The Japan Society of Naval Architects, 5. Kobayashi, H, Kagemoto, H and Furukawa, Y., 995. Mathematical models of ship manoeuvring motion, nd Symposium, The Japan Society of Naval Architects, Safe way, 004. Korean Maritime Safety Tribunal, 3(7), 5 6. Yasukawa, H., 99. Numerical Calculation of steady turning performance of a thin ship, Proc. MCMC 9, 9 3. Yoon, J.D., 977. A study about the effect of speed on turning circle and applying it to actual ship handling, The Research Journal of the Korean Maritime university, Yoon, J.D, 98. A study on the approaching distance in taking action to avoid collision, The Journal of the Korean Institute of Navigation, 6()