A method for predicting the radiated sound field of a three-dimensional structural sound source in a shallow sea channel

Abstract

The invention discloses a three-dimensional structure sound source radiation sound field forecast method under the shallow sea channel and belongs to the sound source radiation sound field forecast field. The method is characterized in that firstly, a structure sound radiation multi-physical field coupling model under the shallow sea channel is established, the sea sound propagation theory is selected according to analysis frequency range, calculation distance and shallow sea environment factors to establish a two-dimensional axisymmetric channel transmission function G, through orientation coupling solution development, a channel three-dimensional sound field transmission function is acquired, secondly, the shallow sea channel multi-boundary sound field coupling calculation theory is employed to establish a multi-physical field coupling model, a structure sound source surface speed U under the shallow sea channel under the action of multi-boundary influence is acquired through calculation, and lastly, the Fourier wave superposition method theory is utilized to forecast the sound field information P of a structure sound source at any field point under the channel is forecasted. Themethod is advantaged in that multiple bottleneck problems of high computational complexity, multiple coupling physical fields and complex channel environments existing during researching three-dimensional elastic structure sound source radiation sound field characteristics under the complex shallow sea channel in the prior art are effectively solved.

Description

technical field [0001] The present invention relates to the field of sound source radiation sound field forecasting, in particular to a method for forecasting the sound source radiation sound field of a three-dimensional structure in a shallow sea channel. Background technique [0002] Studying the acoustic radiation characteristics of elastic structures in shallow sea channels has extremely important theoretical and military value for real-time prediction of radiation noise and effective noise control of submersibles. It will be one of the hot and difficult issues of long-term concern in the field of underwater acoustic technology in my country . [0003] However, at present, the problem of multi-physics coupling vibration and acoustic radiation of underwater elastic structures is mostly considered as a short-range sound field problem in unbounded or semi-space fluid domains, and there are few studies on the multi-physics coupling acoustic radiation problem of elastic struct...

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Problems solved by technology

[0004] The present invention provides a new method for predicting the radiation sound field of sound sources with arbitrary elastic structures in the environment of shallow sea channels, and effectively solves the problems encountered by traditional numerical methods and analytical methods when studying the prediction of radiation sound fields of sound sources with complex elastic structures in shallow sea channels Many bottleneck problems such as large amount of calculation, many coupled physical fields and complex channel environment

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