Coupled FEM-PE-based sound radiation prediction method of elastic structure under ocean channel

Abstract

The invention provides a coupled FEM-PE-based sound radiation prediction method of an elastic structure under an ocean channel. Firstly, a multi-physical-field coupling theory model of sound radiationof the structure under an ocean channel environment is established; a finite-element method (FEM) is utilized to acquire a radiation sound field on one-dimensional transversals of a depth direction;and a piecewise cubic Hermite interpolation method is adopted to carry out perfect matching, namely a FEM-PE coupling condition, of FEM sound field information and grid points of a parabolic-equation(PE) method on space, then the radiation sound field information is used as an initial condition of PE finite-difference-method (FDM) calculation, and then quick prediction of the sound field at any field point of the elastic structure under the ocean channel is carried out after setting related parameters of the PE method. According to the method, adaptability on the elastic structure and the ocean channel is high, a calculation result is accurate, efficiency is high, use is simple, and promotion is easy, and many bottleneck problems that large calculation amounts, multiple physical fields, complex channel environments and the like currently encountered when sound radiation prediction of elastic structures under ocean channels are studied are effectively solved.

Description

technical field [0001] The invention relates to an efficient and accurate research method in the fields of elastic structure radiation sound field prediction under ocean channel, underwater acoustic target detection and channel ocean environment parameter inversion. Background technique [0002] The research on the sound radiation prediction method of elastic structures under the ocean channel has important theoretical research value for the real-time forecast and effective control of structural vibration radiation noise, and plays a pivotal role in the real-time monitoring and prediction of radiation noise in ocean channels. It is one of the hot and difficult issues in the field of underwater acoustic technology for a long time. [0003] However, at present, the fluid domains of vibration and acoustic radiation research of elastic structures under ocean channels are mostly considered as unbounded or semi-space fluid domains, and the research on multi-physics coupling acoust...

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Problems solved by technology

All of the above have led to the inability to effectively carry out research on acoustic radiation of elastic structures under channels from the perspective of theoretical solutions and numerical methods, but it is of great significance to the acoustic radiation, prediction and identification of underwater structures in the ocean, and it is urgent to explore a new research Method to Solve Structure-Acoustic Radiation Problems in Ocean Channels

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