2. A study On Propeller Noise Reduction of a Support Ship "Yokosuka" for a 6,500 m Deep Submergence Research Vehicle

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This paper describes studies on propeller noise reduction and application to the low noise propeller design of the newly built support ship "Yokosuka" for the 6,500 m deep submergence research vehicle. Propeller noise is one of the main underwater radiated noise sources and it was very important technical item to reduce the propeller noise below the required level drastically. So both improvement of the propeller shape and optimization of the CPP blade angle-revolution number combination were investigated widely from a viewpoint of minimizing cavitation occurrence at various operating conditions, by conducting full scale propeller noise measurements of the support ship "Natsushima" already built and various model tests in the cavitation tunnel. Tip unloaded skewed CPPs were finally designed, through the use of noise measurements of model propellers in the cavitation tunnel and theoretical calculations by the propeller lifting surface program. The full scale propeller noise was measured at her sea trial and compared with the predicted noise. It was found that noise levels of the full scale propeller were very low and sufficiently satisfied the required noise value. Our method was very effective in designing a low noise propeller.
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