The acoustical characteristics of a metal ball entering into water

Abstract

The sound of objects into the water is very important to the detection and identification of underwater targets. The Metal ball into the water will produce an unique sound signal, which can be used for monitoring the target and evaluating the performance of the sonar. The main influence terms of the radiation noise of the metal ball into the water are analyzed in this paper, and the noise of the metal ball entering into water consists of initial impact sound and bubble sound, and the characteristics of the initial impact sound and the bubble sound are summarized. A set of metal ball entering the water equipment was set up to make the metal ball enter the water at different depths and angles, and the test was finished in the pool of the Harbin Engineering University Underwater Department. A special acoustic signal during the quiet area is discovered, which is related to the size of metal ball and the speed of the metal ball entering water. The sound of the metal entering water was measured, and the relationship between the sound characteristics of the metal ball entering water and the metal ball size, the velocity, and the angle of metal entering water was obtained by processing the measuring data. The sound of objects into the water is very important to the detection and identification of underwater targets. The Metal ball into the water will produce an unique sound signal, which can be used for monitoring the target and evaluating the performance of the sonar. The main influence terms of the radiation noise of the metal ball into the water are analyzed in this paper, and the noise of the metal ball entering into water consists of initial impact sound and bubble sound, and the characteristics of the initial impact sound and the bubble sound are summarized. A set of metal ball entering the water equipment was set up to make the metal ball enter the water at different depths and angles, and the test was finished in the pool of the Harbin Engineering University Underwater Department. A special acoustic signal during the quiet area is discovered, which is related to the size of metal ball and the speed of the metal ball entering water. The sound of the metal entering water was measured, and the relati...