35000吨肥大船浅水操纵性能改进

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，采用西林舵和鱼尾组合舵，增大舵面积等改进措施，通过自由自航模的常规试验和淌航试验，比较了每一单项改进措施对船舶浣操纵性指标及淌航操纵性指标的定量影响。

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

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.