肥大船の操縦運動における異常現象の研究

概要

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In this paper unusual phenomena in manoeuvring quality of full ships which are characterized by unusual course stability in small rudder angles are treated in relation to the unstable phenomena in propulsion tests. Manoeuvring tests as well as propulsion tests were conducted on a model which is liable to both phenomena. Effect of fins near the water surface was also investigated which were designed to prevent the downward stream and intermittent air drawing before the propeller. As a result, followings were found showing interrelation between both phenomena. (1) Unusual turning moment in manoeuvring motions is considered to be due to lateral force accompanied with unstable phenomena. (2) Both unusual phenomena and unstable phenomena are induced by action of propeller. (3) By fitting appropriate stern fins, unusual phenomena and unstable phenomena can be suppressed.
社団法人日本船舶海洋工学会の論文