Abstract
The radiated noise of a ship is mainly composed of a low-frequency line spectrum and a medium-high frequency broadband continuum spectrum. In the ocean, the low-frequency sound signal decays slowly, so the low-frequency line spectrum of ship radiated noise can be transmitted over long distances. Based on the statistical analysis method, the inherent source characteristics of radiated noise are obtained from the measured data in shallow sea waveguides. Different deep sea sound velocity distribution conditions, such as the northeastern Atlantic Ocean, the Norwegian Sea deep sea, the Norwegian sea surface channel and the polar regions, were selected, and the propagation characteristics of the low-frequency radiation noise field of the ship were simulated at a horizontal distance of 150 km. The effects of different sound velocity distributions on the propagation of low-frequency acoustic signals are obtained. The research results have important practical significance for the utilization of low-frequency radiation noise characteristics of ships in deep sea.
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