Abstract
It is well known that the heel affects the ship maneuverability significantly, however there is no quantitative evidence on the maneuvering motions of full-scale ships so far. To capture the heel effect on the ship maneuverability, full-scale trials were carried out using a training ship “Toyoshio-Maru” of Faculty of Applied Biological Science, Hiroshima University, Japan. Zig-zag test and turning test were conducted in 4 different heeled conditions. Motion measurement was performed using a K-GPS (Kinematic GPS) system with 3 antennas placed on the ship. The heel angle φ was varied as 3.5, -0.4, -1.5, and -5.6 degrees. Negative φ means the heel to port side. In case that the azimuth angle was -10 degrees, the turning circles become large with increasing the heel angle to port side. In case that the azimuth angle was 10 degrees, on the other hand, the turning circles become small with increasing the heel angle. The heel angle increase to the port side is corresponding to the azimuth angle increase to positive direction. In case of the present ship “Toyoshio-Maru”, -2 degrees of the heel angle is equivalent to almost 1 degree of the azimuth angle.Thus, the heel effect on the ship maneuvering motions was successfully captured in full-scale trials.
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