Prediction Method of the Low-Frequency Multistatic Scattering Sound Field for Underwater Spherical Targets Based on Limited Data

doi:10.16183/j.cnki.jsjtu.2022.463

Abstract

Abstract:

A prediction method based on the information data of finite scattering acoustic pressure is proposed for the prediction of underwater spherical target multistatic acoustic scattering sound field, which represents the scattering sound field as the product of the acoustic scattering transfer function and the source density function, obtains the acoustic scattering transfer function by numerical integration with the model surface grid information as input, and acquires the source density function by combining acoustic reciprocity, least squares, and matrix transformation with small amount of known scattered sound pressure data as input. The multistatic scattering sound field prediction method is validated by using the Rayleigh normal mode solution and the finite element method (FEM) for double-layered spherical shells and spherical shell with the.pngfener. The target strength experiment is conducted for the spherical shell with the.pngfener, and the experiment results are compared with the finite element calculations. Several test data and FEM calculation results data are used as input to predict the multistatic scattering sound field of the spherical shell with.pngfener and compared with the FEM results, respectively. It is found that the simulation and test results are in good agreement, which verifies the feasibility of the prediction method.

Key words: acoustic scattering, multistatic scattering sound field, spherical target, sound field prediction, bistatic configuration

CLC Number:

O427.2

CHEN Changxiong, PENG Zilong, SONG Hao, XUE Yaqiang, ZHOU Fulin. Prediction Method of the Low-Frequency Multistatic Scattering Sound Field for Underwater Spherical Targets Based on Limited Data[J]. Journal of Shanghai Jiao Tong University, 2024, 58(7): 1006-1017.

Figures/Tables 12

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References 20

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分置角	入射波频率300 Hz		入射波频率500 Hz		入射波频率700 Hz
分置角	FEM	试验	FEM	试验	FEM	试验
0°	-30.81	-31.31	-26.76	-26.12	-27.58	-26.93
45°	-30.67	-31.75	-24.79	-25.46	-24.01	-23.42
90°	-31.03	-32.62	-23.08	-22.42	-17.82	-18.95
135°	-32.68	-33.98	-25.26	-23.13	-21.3	-20.12
180°	-33.93	-35.96	-28.15	-26.42	-26.52	-24.41

计算频率/Hz	输入元素分置角/(°)	试验数据输入数据平均误差/dB	基于试验数据预报平均误差/dB	基于有限元数据预报平均误差/dB
300	0、45、90、135、180	1.3	1.255	0.001
	0、45、90	1.1	0.967	0.079
	0、90、180	1.4	1.471	0.011
	0、45、135	1.0	1.153	0.026
	45、90、135	1.3	1.144	0.018
	90、135、180	1.7	2.626	0.976
	45、135、180	1.4	1.241	0.380
500	0、45、90、135、180	1.1	1.128	0.006
	0、45、90	0.6	1.202	0.254
	0、90、180	1.0	0.938	0.104
	0、45、135	1.1	1.422	0.219
	45、90、135	1.1	1.326	0.194
	90、135、180	1.5	2.466	1.348
	45、135、180	1.5	1.469	1.308
700	0、45、90、135、180	1.1	1.274	0.481
	0、45、90	0.7	1.085	1.663
	0、90、180	1.3	1.280	0.902
	0、45、135	0.8	1.895	1.747
	45、90、135	1.0	1.141	1.029
	90、135、180	1.4	2.492	2.103
	45、135、180	1.3	2.954	2.777