Singing Problem of High Efficiency Propeller

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  • 高効率プロペラの鳴音問題
  • コウコウリツ プロペラ ノ メイオン モンダイ

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Abstract

The cause of propeller singing could be explained by the resonance between Karman vortex street from the trailing edge of 0.55R-0.6R and the natural frequency of the blade. Therefore the modification of shape around the trailing edge by grinding could almost prevent the singing.<BR>However, recently there were many cases that the propeller singing could not be prevented by the usual measure. In this study, the characeristics of the recent singing and its preventive measures are considered using FFT analyzer of noise occurred on some large ships. In consequence, one of the new antisinging method leading to good results on some applied ships is shown.

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