DocumentCode :
2842981
Title :
Probable origin of measured supertanker radiated noise spectra
Author :
Cybulski, John
Author_Institution :
Naval Research Laboratory, Washington, DC, USA
fYear :
1977
fDate :
17-19 Oct. 1977
Firstpage :
184
Lastpage :
191
Abstract :
This paper will deal with initial measurements of the acoustic pressure levels radiated by the modern and largest merchant ships - the supertankers, greater than 100 thousand DWT, in the frequency band 2 to 80 Hz. Those shaft and blade rate lines detected are converted to source pressure levels (SPL) in dB// 
Pa at 1m. For some selected lines a typical radiation pattern is constructed. A comparison is made of the measured and calculated blade rate tonals and a discussion is presented on several mechanisms for the enhancement of their harmonics.
Pa at 1m. For some selected lines a typical radiation pattern is constructed. A comparison is made of the measured and calculated blade rate tonals and a discussion is presented on several mechanisms for the enhancement of their harmonics.Keywords :
Acoustic sensors; Aerospace electronics; Aircraft navigation; Calibration; Electronic ballasts; Frequency; Instruments; Marine vehicles; Sonar equipment; Weather forecasting;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
OCEANS '77 Conference Record
Conference_Location :
Los Angeles, CA, USA
Type :
conf
DOI :
10.1109/OCEANS.1977.1154413
Filename :
1154413
Link To Document :
