急速停止時および後進時におけるトルク変動の実態調査

概要

論文の詳細を見る
Fluctuation of shaft torque which occurs during the crash stop maneuver is considerably larger than that under the ordinary ahead condition. It may be supposed that this phenomenon will be caused by the following reasons, 1) unstableness of flow field around a propeller, 2) stall of propeller blade, 3) resonance on torsional vibration of shaft. But, there are only few studies with respect to the cause and the reduction methods of the torque fluctuation concerned, especially on ship with ducted propeller. Thus, in order to measure the torque fluctuation during the crash stop motion, the experiments were conducted on the models of large tanker which large fluctuation of torque seemed to be influenced by the outfit of ducted propeller was experienced. The effect of propulsion devices, that is, conventional and ducted propellers, and of duct shape on the torque fluctuation were investigated by means of experiments. The main results obtained are as follows: 1) The torque fluctuation of ducted propeller during the crash stop moneuver was about two times that of conventional propeller, except the former part of decreasing advance speed. 2) The effect of duct shape on the torque fluctuation was not found on such a ship.
独立行政法人海上技術安全研究所の論文
1981-01-31