Abstract
Studies on reducing propeller noise from the supporting ship for a deep submergence research vehicle are described. The propeller investigated was a controllable pitch propeller (CPP). The studies included noise measurements on a full scale propeller; noise measurements on a model propeller in a cavitation tunnel; and a theoretical analysis of what CPP operating conditions might result in least noise. It was found that there are optimal combinations of propeller blade angle and propeller revolutions that do minimize noise. The model tests showed these phenomena to be strongly related to the occurrence of propeller cavitation.
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