00000nam 2200000zi 4500 9.943023 CaOODSP 20241210100945 m o d f cr bn||||||||| 240909e198806##nscd ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre D68-21/19-1988E-PDF Sponagle, Neil Charles, 1955- author. Variability of ship noise measurements / Neil Sponagle ; approved by L.J. Leggat. Dartmouth, N.S. : National Defence, Research and Development Branch, Defence Research Establishment Atlantic, June 1988. 1 online resource (v, 34 pages) : graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier Technical memorandum ; 88/210 Cover title. Digitized edition from print [produced by Defence Research and Development Canada]. Includes bibliographical references (page 32). "Ship noise measurements are subject to relatively large variations that should be considered when these data are used. For modern naval ships operating at high speeds, propeller cavitation is the dominant source of radiated noise. This paper examines the variability of the broadband component of propeller cavitation noise based on statistical analysis of repeated measurements for several ships and propellers and on a conceptual model of the measurement process. Confidence intervals are determined for measured noise spectra and correlations are sought between the variability and certain important parameters. To explain these results, a number of phenomena are discussed that affect either the sound transmission properties of the water, the measurement procedure, or the acoustic source strength of propeller cavitation"--Abstract, page ii. Includes abstracts in English and French. Ships Noise Measurement. Propellers Cavitation. Propellers Noise. Cavitation noise. Navires Bruit Mesure. Hélices Cavitation. Hélices Bruit. Cavitation Bruit. Defence Research Establishment Atlantic, issuing body. D.R.E.A. technical memorandum ; 88/210. (CaOODSP)9.941838 PDF 1.46 MB https://publications.gc.ca/collections/collection_2024/rddc-drdc/D68-21-19-1988-eng.pdf