Accession Number : ADA018116

Title :   A Review of Towship Radiated Noise of the R/V Daniel L. Harris, III.

Descriptive Note : Final rept.,

Corporate Author : MAR INC ROCKVILLE MD

Personal Author(s) : Waters,John F.

Report Date : NOV 1975

Pagination or Media Count : 99

Abstract : Stern-aspect radiated noise levels of a research towship measured during the past five years are reviewed. It is concluded that in addition to propulsion machinery noise at all towspeeds, the propeller cavitation component of Harris radiated noise is presently quite significant at low towspeeds. Propeller cavitation noise levels in the neighborhood of 100 Hz have increased by about 15 dB during the past five years, at speeds in the range from 5 to 10 kt. It is recommended that a serious effort be made to reshape the Harris propellers to conform to their original specification. This report also reviews operating characteristics of the Harris, and discusses corrections for shallowwater and deep-water sound propagation conditions which must be applied to measured noise levels in order to estimate the desired free-field radiated noise levels.

Descriptors :   *Ship noise, *Surface navigation, *Research ships, Statistical data, Velocity, Propeller noise, Propulsion system components, Cavitation noise, Intensity, Acoustic measurement, Corrections, Deep water, Shallow water, Propagation, Noise reduction, Naval research

Subject Categories : Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE