Modeling and characteristic analysis of underwater acoustic signal of the accelerating propeller

Yuan Feng, Ran Tao*, Yue Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The signal feature of propeller cavitation noise during acceleration or deceleration procedure can be used to passively detect and classify moving vessels and underwater vehicles in the port regions. By analyzing the chirp periodicity of the variation of propeller wake velocity under acceleration situation, this paper presents a time domain expression of the modulation envelope signal of the accelerating propeller noise, treating the signal as a Gaussian-shaped chirp periodic pulse train with increasing trend and fluctuating pulse amplitude. The paper investigates the characteristics of simplified fractional Fourier transform (SFRFT) spectrum of the chirp periodic signal, and thus obtains the relation between the chirp periodic signal and its chirp harmonics under the conditions of underwater passive detection. Furthermore, the experimental data of the cavitation tunnel satisfy the results obtained by simulation, which verifies the correctness of the proposed signal model.

Original languageEnglish
Pages (from-to)270-280
Number of pages11
JournalScience China Information Sciences
Volume55
Issue number2
DOIs
Publication statusPublished - Feb 2012

Keywords

  • accelerating propeller
  • chirp periodic signal
  • modeling of underwater acoustic signal
  • simplified fractional Fourier transform

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