Theoretical and numerical investigations of the acoustic field excited by submarine explosion

Abstract

This paper simulates and analyzes numerically the dispersion characteristics of the waves propagating in the shallow-ocean overlying a semi-infinite elastic solid. The analytical solution of the acoustic field in the shallow-ocean, excited by an explosive point source in the solid bottom, is derived by using the theories for sound propagation in liquid and solid. The time-domain waveforms of transient acoustic field are simulated with the above analytical solution. The dispersion characteristics of the transient acoustic field are analyzed by using the smoothed pseudo Wigner-Ville distribution.

The power spectrum and correlation of flow noise for an axisymmetric body in water

“…Based on the Lighthill theory, Lauchle [7,8] derived the model of the noise generated by axisymmetric turbulent boundary layer flow and made an experimental effort to characterize the broadband flow-induced self-noise on a spherically shaped acoustic velocity sensor operating in water. Due to the complex reverberation [9] and dispersive propagation [10] in the shallow water, the measurements of flow noise were still restricted in the laboratory. [11] All the above methods were used mainly to calculate the flow field and the power spectrum of the flow noise.…”

Physical model of acoustic forward scattering by cylindrical shell and its experimental validation

“…In the experiments of monostatic sonar, [11,12] the environment and the target shape in reality were considered in the measurement of monostatic target strength. However, due to the complex bistatic reverberation [13] and dispersive propagation [14] in the shallow water, the measurements of forward scattering were still restricted in the laboratory. [15,16] Especially there has been almost no published report on the forward scattering by large target.…”