水下球面嵌入角反射体结构声目标强度增强设计研究

Study on acoustic target strength enhancement design of underwater spherical embedded corner reflector structure

  • 摘要: 【目的】为设计小尺度、高目标强度的水下无源声诱饵,提出一种在球上按照球面螺旋线环绕方式均匀嵌入一定数量角反射体的结构,并研究其声散射特性。【方法】采用有限元数值计算方法建立球面嵌入角反射体声散射模型,对比分析球面嵌入角反射体结构与实心球的声散射特性,通过遗传算法对结构参数进行优化,揭示球面嵌入角反射体的三角形开口方向、结构参数等因素对模型声散射的影响规律。【结果】数值计算和试验结果表明,球面嵌入角反射体的三角形开口方向不影响模型的声散射特性,球面嵌入角反射体数量、边长以及外接圆面积占比对模型声散射的影响较大,通过遗传算法优化后的球面嵌入角反射体模型可实现指定角度范围内的声目标强度增强。【结论】研究成果可为水下无源声诱饵的优化设计提供参考。

     

    Abstract: Abstract:Objectives In order to design a small-scale underwater passive acoustic decoy with high target strength, a structure of uniformly embedding a certain number of corner reflectors on the ball according to the spherical spiral winding method is proposed, and its acoustic scattering characteristics are studied. Methods The acoustic scattering model of spherical embedded corner reflector is established by finite element numerical calculation method. The acoustic scattering characteristics of spherical embedded corner reflector structure and solid sphere are compared and analyzed. The structural parameters are optimized by genetic algorithm, and the influence of triangular opening direction and structural parameters of spherical embedded corner reflector on the acoustic scattering of the model is revealed. Results The numerical calculation and experimental results show that the triangular opening direction of the spherically embedded corner reflector does not affect the acoustic scattering characteristics of the model. The number of spherically embedded corner reflectors, the side length and the area ratio of the circumcircle have a great influence on the acoustic scattering of the model. The spherically embedded corner reflector model optimized by genetic algorithm can enhance the intensity of the acoustic target within the specified angle range. Conclusions The research results can provide reference for the optimal design of underwater passive acoustic bait.

     

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