The empirical mode decomposition (EMD) methodology for analysing the impact response features of a naval vessel is proposed and investigated. Records collected from the vessel structure subjected to underwater explosions (UNDEX) are used in this study. The ability of EMD to extract the two oscillation modes, the intrinsic mode functions (IMFs) and the frequency energy mode, is demonstrated. The spectrum obtained using the Hilbert Huang transform (HHT) method can provide more precise and effective time-frequency energy representations than those obtained using the short time Fourier transform (STFT) or wavelet transform (WT) based methods. It is concluded that HHT is a useful tool from which to gain an in-depth understanding of the impact response of UNDEX and be able to quantify it.
Time-frequency feature analysis of naval vessel impact response using the Hilbert Huang transform method
Journal of Marine Engineering & Technology ; 12 , 1 ; 35-45
2013-01-01
11 pages
Article (Journal)
Electronic Resource
English
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