Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0205, USA.
J Acoust Soc Am. 2013 Apr;133(4):1971-80. doi: 10.1121/1.4790356.
U.S. Coast Guard Cutter Healy's underwater radiated noise signature was characterized in the central Arctic Ocean during different types of ice-breaking operations. Propulsion modes included transit in variable ice cover, breaking heavy ice with backing-and-ramming maneuvers, and dynamic positioning with the bow thruster in operation. Compared to open-water transit, Healy's noise signature increased approximately 10 dB between 20 Hz and 2 kHz when breaking ice. The highest noise levels resulted while the ship was engaged in backing-and-ramming maneuvers, owing to cavitation when operating the propellers astern or in opposing directions. In frequency bands centered near 10, 50, and 100 Hz, source levels reached 190-200 dB re: 1 μPa at 1 m (full octave band) during ice-breaking operations.
美国海岸警卫队希利号破冰船在北冰洋中部的水下辐射噪声特征在不同类型的破冰作业中得到了描述。推进模式包括在不同的冰盖下航行、使用后退和撞击操纵来打破重冰以及使用艏侧推器进行动力定位。与在开阔水域航行相比，希利号在破冰时，20Hz 至 2kHz 之间的噪声信号增加了约 10dB。当船舶进行后退和撞击操纵时，由于螺旋桨向后或相反方向运转时产生的空化现象，船舶产生的噪声水平最高。在中心频率为 10、50 和 100Hz 的频带内，在破冰作业期间，声压级达到 190-200dB re：1μPa@1m（全倍频带）。
