A Review of Towship Radiated Noise of the R/V Daniel L. Harris, III.
MAR INC ROCKVILLE MD
Pagination or Media Count:
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.
- Marine Engineering