Analysis of the acoustic scattering properties of underwater objects coated with viscoelastic damping layer

Abstract

The acoustic software of Actran was used to calculate the sound scattering characteristics of the underwater spherical shell. The accuracy of the numerical calculation was verified by comparing with the theoretical values. Furthermore, a damping layer of viscoelastic material was coated outside the spherical shell, and the sound scattering characteristics of the shell after the damping layer was calculated and analyzed. The calculation results show that the intensity of acoustic target is reduced to a certain extent in most of the analysis frequency bands after the viscoelastic damping layer is laid, especially in the low frequency band has been greatly attenuated. At low frequencies, the distribution of scattered sound pressure field of a spherical shell with a viscoelastic damping layer is much more regular than that of an elastic shell sphere. The interference level of the sound field in front and in back of the spherical target is obviously less than that of the elastic light shell. Study has shown that laying a viscoelastic damping layer helps to reduce the sound scattering intensity of underwater targets to a certain extent and improves the invisibility of underwater targets.