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Monday, July 8 • 12:00 - 12:20
[NO-SHOW] A STUDY ON INFLUENCE OF CAVITATION ON PROPELLER NOISE MODULATION CHARACTERISTICS

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After cavitation, the noise of propeller will become the main component of ship radiation noise. It is necessary to detect propeller cavitation in real time to reflect a ship's acoustic performance. In order to detect propeller cavitation accurately, various characteristics of cavitation noise are inves-tigated. In this research, propeller noise under different rotating speeds of a trial ship is collected by a hydrophone fixed at the aft hull. The original noise signal is processed by wavelet packet re-construction to obtain cavitation characteristic signal. The envelope of cavitation characteristic signal is demodulated and its features changes in time domain and frequency domain are analyzed. The results indicate that the structure of DEMON spectrum changes and the modulation degree of cavitation characteristic signal increases with the development of cavitation. In addition, it is more effective to detect propeller cavitation by monitoring the amplitude of modulation frequency line spectrum in DEMON spectrum than sound pressure level of noise signal.

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Monday July 8, 2019 12:00 - 12:20 EDT
Westmount 5
  T12 Underwater & marit. noise, SS01 … underwater snd measur & monit