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Shock and Vibration
Volume 2017, Article ID 6930605, 9 pages
https://doi.org/10.1155/2017/6930605
Research Article

Ship Radiated Noise Recognition Using Resonance-Based Sparse Signal Decomposition

1Key Laboratory of Underwater Acoustic Communication and Marine Information Technology, Ministry of Education, Xiamen University, Xiamen 361005, China
2Science and Technology on Underwater Acoustic Antagonizing Laboratory, Systems Engineering Research Institute of China State Shipbuilding Corporation, Beijing 100036, China

Correspondence should be addressed to En Cheng; nc.ude.umx@negnehc

Received 14 December 2016; Revised 5 April 2017; Accepted 27 April 2017; Published 17 May 2017

Academic Editor: Carlo Trigona

Copyright © 2017 Jiaquan Yan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Under the complex oceanic environment, robust and effective feature extraction is the key issue of ship radiated noise recognition. Since traditional feature extraction methods are susceptible to the inevitable environmental noise, the type of vessels, and the speed of ships, the recognition accuracy will degrade significantly. Hence, we propose a robust time-frequency analysis method which combines resonance-based sparse signal decomposition (RSSD) and Hilbert marginal spectrum (HMS) analysis. First, the observed signals are decomposed into high resonance component, low resonance component, and residual component by RSSD, which is a nonlinear signal analysis method based not on frequency or scale but on resonance. High resonance component is multiple simultaneous sustained oscillations, low resonance component is nonoscillatory transients, and residual component is white Gaussian noises. According to the low-frequency periodic oscillatory characteristic of ship radiated noise, high resonance component is the purified ship radiated noise. RSSD is suited to noise suppression for low-frequency oscillation signals. Second, HMS of high resonance component is extracted by Hilbert-Huang transform (HHT) as the feature vector. Finally, support vector machine (SVM) is adopted as a classifier. Real audio recordings are employed in the experiments under different signal-to-noise ratios (SNRs). The experimental results indicate that the proposed method has a better recognition performance than the traditional method under different SNRs.