Sound field acquisition method of three-dimensional sound field model based on global matrix coupling normal wave

Abstract

The invention belongs to the technical field of underwater sound field calculation, and particularly relates to a sound field acquisition method of a three-dimensional sound field model based on global matrix coupling normal waves, which comprises the following steps of: applying Fourier transform to a pre-established three-dimensional Helmholtz equation according to acquired marine environment parameters of a target area to obtain a three-dimensional sound field model; a two-dimensional line source Helmholtz equation for the target area is obtained; dispersing the horizontal change waveguide into a plurality of sections of horizontal invariant waveguides; selecting a certain specific characteristic value, applying a corresponding boundary condition on the vertical boundary of each section of the horizontal invariant waveguide to obtain a global matrix, solving a normal wave coefficient corresponding to each section of the horizontal invariant waveguide, and obtaining a two-dimensional sound pressure solution corresponding to each section of the horizontal invariant waveguide; and repeating the above process, then obtaining two-dimensional sound pressure solutions corresponding to each characteristic value in each section of horizontal invariant waveguide, performing summation, and then adopting inverse Fourier transform to obtain a three-dimensional sound pressure solution of the target area.

Description

technical field [0001] The invention belongs to the technical field of underwater sound field calculation of underwater acoustic physics and underwater acoustic engineering, and in particular relates to a sound field acquisition method based on a three-dimensional sound field model of a global matrix coupled normal wave. Background technique [0002] Acoustic waves are the only known physical form that can travel long distances in seawater media, and are an important carrier for detecting the marine environment, developing marine resources, and realizing underwater information transmission. The study of the propagation characteristics of sound waves in seawater media is one of the important fields of oceanographic research, and it is also the basis for studying other ocean acoustic problems. [0003] The commonly used underwater sound propagation model is difficult to accurately calculate the sound field in a complex three-dimensional ocean environment. For example: the und...

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Problems solved by technology

[0003] The commonly used underwater sound propagation model is difficult to accurately calculate the sound field in a complex three-dimensional ocean environment

For example: the underwater sound propagation model based on the ray method is only suitable for calculating the propagation of high-frequency sound waves; the underwater sound propagation model based on the parabolic equation method has poor calculation accuracy for the sound field in environments with severe level changes; The underwater acoustic propagation model of the normal wave method and the wave number integration method cannot calculate the sound field in the environment of level change; the underwater sound propagation model based on the coupled normal wave method can be used to deal with the sound field in the environment of severe level change, but the existing coupling There will be instability in the normal wave model

[0004] Therefore, the existing methods cannot solve the problem of underwater sound propagation in a three-dimensional complex environment, and cannot obtain the sound field in a three-dimensional complex ocean environment

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