The merchant ships including passenger ship target are one of important source of sea environment noise, and is also the primary background jam of underwater passive detection and target recognition, especially areas in shore. Consequently, this paper mainly focuses on measuring and analyzing acoustic spectrum and signature of underwater radiated noise originated from a passenger ship with more than ten thousands of tonnages, especially focusing on the distribution of power and frequency, the amount of stable line-spectrum, structure of envelope modulation spectrum and its stability of amplitude. And the analysis results can be further applied in the studies on underwater passive detection, target recognition and ship acoustic design, especially for passenger ships.
In the question of the impact of the main-beam width on vessel radiated noise power spectrum characteristics, a typical mathematical model was established, the influence of the main-beam covering vessel and its trajectory on the acquisition of vessel radiation noise power spectrum characteristics is studied. Theoretical and simulation results show that when main-beam cannot cover the vessel and its trajectory, the method of multi-beam synthesis should be apply in order to undistorted acquire the vessel radiation noise power spectrum characteristic. A cargo-ship radiated noise characteristics is acquired based on the method of multi-beam synthesis in this paper, the difference of broadband sound pressure level acquired by beamforming and single hydrophone is less than 1.8dB. The research results can provide a basis and example for the effective acquisition of vessel radiated noise characteristics based on acoustic measurement array.
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