Abstract
The total unsteady cavitation volume on a given propeller, which generates radiated noise at propeller blade rate and harmonics, can be bounded from basic design considerations. At a vessel's design speed, an upper limit to this unsteady cavitation exists from considerations of excessive ship vibrations, and a lower limit exists from considerations of propeller efficiency. This paper presents a model for blade rate radiated noise from merchant ships which is based on these design limitations for cavity volume, and an elementary radiation model. A sample survey was made of the propeller characteristics of the world fleet, which allows the further derivation of a source model based on physical characteristics of a given ship, including a definition of the uncertainty of the estimate. This model is exercised for the estimated merchant ship population at sea and a stochastic representation is derived for the source levels and frequencies to be expected for this merchant fleet operating at its design speed.
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