Study on the characteristics of the water-entry sound of low-speed metal sphere

Abstract

In this paper, the underwater acoustic characteristics of low-speed metal spheres are measured by direct measurement from the angle of sound pressure of Initial impact sound and bubble pulsating sound, which mainly includes the research on the impact of ball size and ball entry velocity on water entry sound and the characteristics of bubble radius. Experimental data were obtained through a large number of experiments, and the data were simply processed and then fitted by MATLAB. The accuracy of experimental measurement results is analyzed from the perspective of statistics. The results show that the relationship between sound pressure and particle size, 2/3 power of water-entry velocity are exponential function with a base of 10; the relationship between sound pressure level and particle size, 2/3 power of water-entry velocity are linear function; the relationship between bubble radius and particle size, 2/3 power of water-entry velocity are linear function. The variation of each physical quantities with particle size and water entry velocity obtained in this study can be used for simple prediction. With the further research of the subject, the research results will be further optimized.