35000吨肥大船浅水操纵性能改进

IMPROVEMENT ON MANOEUVRING IN SHALLOW WATER OF 35000 TON SHALLOW DRAFT FULL SHIP

本文叙述浅吃水肥大船的操纵性改进试验研究。采取安装不同的稳定鳍、采用西林舵和鱼己组合舵、增大舵面积等改进措施，通过自由自航模的常规试验和尚航试验，比较了每一单项改进措施对船舶常规操纵性指标及消航操纵性指标的定量影响。在组合各改进措施的基础上，形成对目标船的改进方案。和原船比较，在深水航行时，航向稳定性子口转首性各衡准提高了45～75％，淌航操纵性提高了40～60％，浅水航行时，航向稳定性和转首性各衡准可提高20～30％；原船在浅水淌航时只可操一次舵，而改进方案可操两谷次以上。

This paper describes the experimental study for maneuverability improvement about an operating shallow draft full ship, which is a 35, 000-ton coal carrier with CB = 0. 825,L/B = 5. 78, B/T = 3. 20. The paper presents improving methods, such as installing dif ferent stable fins, using a Schilling rudder and a combined rudder with a fish tail, and in creasing rudder area. By conventional free running model tests and coasting tests, the pa per shows the quantitative effects on ship conventional maneuverability criteria (residual angle velocity of yaw ro, course change lag T. l initial turning time t; and relative stable turning diameter DS/L ) and coasting maneuverability criteria (rudder effect keeping time t4, the first course change lag TL ). On the basis of the combination of the improving methods above, the paper obtains the specific improving methods for the ship. By compar ing the ship with the improvement and the original ship, each criterion of the stability and turning ability increases by 45~ 75 % in deep water and 20~ 30% in shallow water. The coasting maneuverability increases by 40~60% in deep water, and the rudder could be op erated only for once for the original ship in shallow water, but more than twice for the im proved one.