Analysis of time–frequency characteristics of wall pressure signals of hull structure subjected to underwater explosion.

With a view to obtaining the time-frequency characteristics of wall pressure signals of hull structure subjected to underwater explosion, based on the experimental wall pressure data of a hull structure model subjected to underwater explosion, the time-frequency characteristics of the wall pressure signals were studied by means of wavelet transform characterized with good time-frequency localization. By using these wall pressure signals, the pressure-time curves and the energy distributions in different frequency bands were obtained. The experimental results show that it is easy to get the time-frequency information details of the wall pressure signals by the wavelet transform, such as intensity, frequency and duration, etc.. Energy statistics show that frequency bands of the wall pressure signals have a wide distribution, more than 80% of the energy of the wall pressure signals is mainly concentrated in the area of less than 20 kHz and the highest level of energy is below the frequency of 5 kHz. [ABSTRACT FROM AUTHOR]