线性内波的简正波耦合效应

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• 英文论文题名：The mode coupling effect of the random linear internal waves
• 论文作者：宋文华 ; 王宁 ; 胡涛 ; 马力
• 英文论文作者：SONG Wen-hua ; WANG Ning ; HU Tao ; MA Li ; Department of Marine Technology ; Ocean University of China ; Key Laboratory of Underwater Acoustic Environment ; Institute of Acoustics
• 年：2016
• 作者机构：中国海洋大学海洋技术系;中国科学院水声环境特性重点实验室声学所;
• 论文关键词：线性内波 ; 绝热近似 ; 简正波耦合
• 英文论文关键词：random linear internal wave ; adiabatic approximation ; mode coupling effect
• 会议召开时间：2016-08-21
• 会议录名称：2016’中国西部声学学术交流会论文集
• 语种：中文
• 分类号：O422.2
• 学会代码：SXJS
• 会议名称：2016’中国西部声学学术交流会
• 会议地点：中国四川成都
• 主办单位：中国声学学会微声学分会、中国声学学会物理声学分会、陕西省声学学会、浙江省声学学会、山东省声学学会、上海市声学学会、黑龙江省声学学会、水声技术重点实验室、重庆市声学学会、西安市声学学会、四川省声学学会
• 学会名称：《声学技术》编辑部
• 页数：4
• 文件大小：615k
• 原文格式：D
• 会议级别：全国

摘要

内波的影响会导致定点接收声场发生频率漂移的现象,而孤子内波导致的简正波耦合效应可以导致频率漂移曲线的断裂。在线性随机内波环境中该现象仍然存在,这说明线性内波也会导致简正波耦合。本文利用Dyson级数给出了线性随机内波耦合矩阵随距离和频率的变化情况。在频率较高或距离较远的情况下,绝热近似条件并不成立,线性内波也会导致明显的简正波耦合。这说明,即便仅有线性随机内波的情况下,接收距离较远也会导致频率漂移曲线的断裂。这种断裂的周期性与内波传播速度有关。
The frequency shift of acoustic interference pattern is introduced by internal waves, and the mode coupling resulting from internal solitons could cause the frequency shift line to break. But this phenomena also exits in the random linear internal waves, which means that the linear internal wave may introduce mode coupling. This paper uses the Dyson series to calculate the mode couple matrix of linear internal waves and analyze its variance as range and acoustic frequency changes. It turns out that, when acoustic frequency is not too low, or when the receiver range is far enough, the adiabatic approximation is not applicable and the linear internal waves could cause mode coupling. This is to say when there is only linear internal wave, as long as the receiver range is far enough the frequency shift line may break in a periodic way, and the period is related to the speed of internal wave.

引文

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