Splash sound feature research based on empirical mode decomposition and Hilbert-Huang spectrum

After the aerial object enters the water, the physical change of bubbles in the water is quite complex. In view of this situation, a new method for feature extraction of bubble sound from the water entry of an object based on empirical mode decomposition and pseudocomponent criterion is proposed. Using the method, volume pulsation of the bubble is made. The experimental study on the water entry sounds of various objects was carried out on Songhua Lake, and the results showed that the frequency estimation of volume pulsation of the bubble is the same as the frequency of zeroth mode of volume pulsation calculated from the theory of bubbles.