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- W3204137736 abstract "内孤立波是一种常见于浅海海域的非线性内波, 具有振幅大、周期短和流速强等特点, 它通过扰动水体中的温盐分布使声速剖面产生明显的距离依赖性, 进而影响水下声传播特性. 内波自生成后通常以 O(1) m/s 量级的速度传播, 运动的内波使声传播路径上声波模态能量在空间和时间上剧烈起伏. 本文定义模态强度为模态系数模值(模态幅度)的平方, 并用其衡量各阶模态所含声能量的大小. 文中基于耦合简正波理论, 推导了内波运动时声波模态强度起伏的表达式, 将模态强度表征为振荡项和趋势项的线性叠加. 以往的工作大多局限于单独从时域或频域研究内波运动时声波模态强度的时变规律, 本文则结合短时傅里叶变换在时频平面上揭示了模态强度的起伏机理. 理论推导和数值仿真均表明内孤立波使各阶声波模态之间发生能量交换, 即模态耦合. 内波的动态传播进一步引起模态干涉, 这种干涉效应表现为模态强度中的振荡项并使模态强度随时间快速起伏. 受模态剥离效应(不同阶模态之间衰减系数的差异)的影响, 趋势项的幅度随时间不断变化, 进而对模态干涉引起的振荡叠加了时变的偏置. 模态强度的整体走势和振荡项中各频率分量振幅的时变特征均与模态衰减密切相关. 同时, 本文使用深度积分声强作为总接收声场强度的度量, 研究了内波运动时模态强度起伏对接收阵位置处声能量的影响. 结果表明, 能量较大且起伏剧烈的模态强度将主导总接收声强的变化." @default.
- W3204137736 created "2021-10-11" @default.
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- W3204137736 date "2021-01-01" @default.
- W3204137736 modified "2023-09-26" @default.
- W3204137736 title "Research on the modal intensity fluctuation during the dynamic propagation of internal solitary waves in the shallow water" @default.
- W3204137736 doi "https://doi.org/10.7498/aps.70.20211132" @default.
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