推進器鳴音に関する一経験
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概要
- 論文の詳細を見る
This report outlines the result of our investigation on the typical singing of propeller, conducted on a ship recently built in our yard. This investigation confirmed Dr. Kito's theory that the singing phenomenon of propeller is the coincidence of frequency of the exciting force to the natural frequency of the propeller blade, which is periodically excited by the Karman Vortices induced from the trailing edge. Singing phenomena measured on our ship were as follows. 1. Singing appeared at about 100 r/m and disappeared at 210 r/m, and no singing above this revolution. 2. Peak frequency of the singing was 655 c/sec, which was independent to propeller revolution. 3. 655 c/sec was found to be one of the natural frequencies of the propeller blade in water. 4. By, so-called, Karman Vortex theory, it was calculated that the effective edge thickness of 2.3 mmφ constantly causes 655 c/sec at the revolutions between about 100 r/m and 210 r/m. 5. It was found during the docking that the edge was about 2 mmφ. 6. The initially designed edge was 1.0 mmφ. At the sea trial conducted after the correction of the edge to 1.0 mmφ, sinig was completely diminished. 7. As the general conclusion, the edges of small diameter propellers must be more accurately finished.
- 社団法人日本船舶海洋工学会の論文
- 1961-03-31
著者
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岡本 洋
川崎重工業株式会社
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岡田 一也
川崎重工業株式会社造船事業部造船設計部
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渡辺 四郎
川崎重工業株式会社
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清水 浩
川崎重工業(株)
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岡本 洋
川崎重工業(株)技術研究所
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安井 三郎
川崎重工業株式会社
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岡本 洋
川崎重工業 (株)
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