Accession Number:

ADA063866

Title:

Source Level Model for Propeller Blade Rate Radiation for the World's Merchant Fleet.

Descriptive Note:

Technical memo.,

Corporate Author:

BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS

Personal Author(s):

Report Date:

1978-07-01

Pagination or Media Count:

43.0

Abstract:

This memo presents a model for the acoustic source strength of blade rate line energy produced by single screw merchant vessels. These source strengths are based on observed cavitation time histories on merchant vessels, and on limitations imposed by considerations of propeller design procedures and ship vibration criteria. Relationships are presented for the expected value of the blade rate source strength for ships of different lengths, expressed both as a monopole source strength located a known depth below a free surface and as a dipole source strength which describes the pressure radiated to the far field. These relationships are based on a small sample of merchant ships characteristics and are exercised for the estimated population of ships at sea to yield a statistical description of the distribution of source strength for the world fleet of single screw merchant vessels. Author

Subject Categories:

  • Marine Engineering
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE