| 高大治,康德祥,宋文华,李小雷,李玉征.广义波导不变量[J].声学技术,2022,41(3):403~411 |
| 广义波导不变量 |
| Generalized waveguide invariant |
| 投稿时间：2022-01-14 修订日期：2022-02-12 |
| DOI：10.16300/j.cnki.1000-3630.2022.03.014 |
| 中文关键词: 水平缓变楔形波导 绝热近似 方位角 波导不变量 |
| 英文关键词: horizontal slowly varying wedge waveguide adiabatic approximation azimuth waveguide invariant |
| 基金项目:国家自然科学基金(11874331、12004359、52001296)资助项目。 |
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| 中文摘要: |
| 海洋波导中声场在空间-频率域形成明暗相间的干涉条纹，Chuprov根据距离-频率(r-ω)域干涉条纹定义了波导不变量。一直以来，科研工作者探讨波导不变量定义式均未考虑声源-接收器方位角对波导不变量β值的影响，传统的声场干涉研究也忽略方位角变化对干涉条纹的影响。通过实验和仿真发现，对于我国近海大陆架常见的水平缓变楔形波导，方位角变化对干涉条纹的影响显著，因此将Chuprov给出的仅考虑传播距离变化对干涉条纹影响的波导不变量定义式推广为同时考虑方位角变化对干涉条纹影响的波导不变量定义式，并将之称为广义波导不变量。通过理论推导、数值仿真及海上实验数据分析发现，在水平缓变楔形波导环境下，传统波导不变量定义式无法解释干涉现象时，广义波导不变量可很好地解释数值仿真及海上实验声场干涉现象。 |
| 英文摘要: |
| In the ocean waveguide, the sound field with light and dark interference fringes can be observed in the spatial- frequency domain. Chuprov defined waveguide invariant according to the interference fringes in the r-ω domain. For a long time, researchers have not considered the effect of source-receiver azimuth angle on the value of waveguide invariant, and the effect of azimuth angle on interference fringes has been ignored in traditional sound field interference studies. In this paper, it is found through experiments and simulations that the azimuth variation has a significant effect on interference fringes for the common horizontal slowly varying wedge waveguide in the offshore continental shelf of China. Therefore, the definition of waveguide invariant given by Chuprov, is extended in the case where the influence of azimuth variation on interference fringes is considered, and it is defined as the generalized waveguide invariant. Through theoretical derivation, numerical simulation and sea trial data analysis, it is found that the generalized waveguide invariant can well explain the acoustic field interference phenomena in the numerical simulation of the horizontal depth slow-varying wedge waveguide and in the offshore experiment, while the traditional waveguide invariant fails to do so. |
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