小型カーフェリーの船尾振動に関する総合的水槽試験 : 特に船尾船底フィンの効果について

概要

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199 gross-ton type car ferries are widely used as connecting boats. The have wide deck area compared with their ship length, and because of the draft limtation they are liable to have peculiar hull forms, which often inbuce vibration problems. In order to clarify the cause and find out the countermeasure of the stern vibration-problem, a cooperative research was made in 1980, by Maritime Credit Corporation and the Ship Research Institute. Through the investigation of actual ships, an example was reported in which the stern vibration was considerably reduced by fitting fins on the fllat hull bottom above the propeller. A series of tasts were made with the above mentioned ship in order to get the clue to the stern vibration problem, and following results were obtained. 1) Without the hull bottom fins, PHV (Propeller-Hull-Vortex) cavitation occurred and was found to be the main cause of the stern vibration problem. 2) PHV cavitation was completely suppressed by fitting fins and the stern vibration was considerably reduced. 3) Stern vibration level was still high even when PHV cavitation was suppressed. That is considered to be due to the wake distribution which has wide dead water region. 4) The inflow of air bubbles into the propeller was observed. 5) Wave breaking at the stem was prominent.
独立行政法人海上技術安全研究所の論文
1983-09-30