水平变化波导中的简正波耦合与能量转移

发布时间：2019-03-28 08:37

【摘要】：针对海底地形水平变化对声场能量传播和声场干涉结构的影响,对简正波之间的耦合和能量转移进行了研究.建立了一种二维大步长格式的耦合简正波模型和三维楔形波导耦合简正波模型,以便快速有效地分析简正波之间的耦合和能量转移.基于耦合简正波模型,阐述了前向声场能量在水平变化波导中传播时的转移过程.并根据射线简正波理论,解释了海底地形变化对声场能量分布的影响机理.水平变化波导中声场的仿真计算表明,当本征值虚部发生剧烈变化时声场存在着较强的简正波耦合和能量转移,且海底地形变化将导致声场能量的水平传播方向偏转至海水深度增加的方向.在声场能量转移和传播方向变化中,声场的能量趋于保留在波导中而不向海底泄漏.同时,声场能量分布受到类似于压缩或稀疏的作用,从而形成椭圆状的干涉结构.
[Abstract]:The coupling and energy transfer between normal waves are studied in view of the influence of horizontal variation of seabed topography on sound field energy propagation and acoustic field interference structure. A two-dimensional large step scheme coupled normal wave model and a three-dimensional wedge-shaped waveguide coupled normal wave model are established in order to analyze the coupling and energy transfer between the normal waves quickly and effectively. Based on the coupled normal wave model, the transfer process of forward sound field energy propagating in horizontally varying waveguides is described. According to the ray normal wave theory, the influence mechanism of the sea floor topography on the energy distribution of the sound field is explained. The simulation of the acoustic field in the horizontal varying waveguide shows that the acoustic field has strong normal wave coupling and energy transfer when the imaginary part of the eigenvalues changes violently. The change of sea bottom topography will cause the horizontal propagation direction of sound field energy to shift to the direction of increasing sea water depth. The energy of the acoustic field tends to be retained in the waveguide without leaking to the bottom of the ocean during the energy transfer and direction change of the sound field. At the same time, the energy distribution of sound field is similar to that of compression or thinning, thus forming an elliptical interference structure.
【作者单位】：哈尔滨工程大学水声技术重点实验室;哈尔滨工程大学水声工程学院;
【基金】：国防科技重点实验室基金(批准号:9140C200103120C2001) 国家自然科学基金重点项目(批准号:11234002)资助的课题~~
【分类号】：TN814

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