Numerical Simulation of Vortex-acoustic Coupled Acoustic Signals Based on Ray Acoustics

摘要

The energy dissipation during the navigation of underwater targets will form large-scale vortices in the ocean. The coupling between sound waves and wake vortices can determine the existence and morphological characteristics of wake vortices, and then to detect underwater targets. Based on the theory of ray acoustics, this paper derives the expression of ray differential equation in a moving medium, and analyzes the influence of steady vortex on sound ray trajectory under low Mach number. The difference in the amplitude and phase of received acoustic signals is discussed, and verified by comparing with the experimental data in the literature. The results show that the numerical method of vortex acoustic field based on ray acoustics proposed in this paper is suitable for simulating the vortex-acoustic coupling effect of steady vortex.