浅水近距离测量声场的干涉结构分析

发布时间：2018-04-28 08:56

本文选题：声场分布 + 干涉场　；参考：《声学学报》2017年02期

【摘要】：为指导浅水中水平距离在十倍水深范围内进行的近距离声学测量工作,选取对软底浅水声场产生主要贡献的直达声线和一次水面反射声线,经过合理的近似处理,以射线解析方式给出了中低频信号声场干涉结构的表达式,并将表达式由单频信号推广到宽带信号和线性调频等信号形式。所得到的解析关系式定量给出了浅水中声场干涉结构与信号频率、信号带宽、设备布放深度和水平距离等参数的关系,由此进一步得到浅水条件下中近距离干涉声场的一些特性和规律。通过数值模拟和实际试验数据对上述关系式所进行的检验表明:在浅水的常规测量试验条件下,这些关系式可以较为准确地反映近距离干涉声场的起伏特征,由关系式推论得到的声场特性和规律也得到了初步验证。
[Abstract]:In order to guide the close range acoustic measurement of horizontal distance in shallow water in the range of 10 times water depth, the direct sound line and the primary reflection sound line, which mainly contribute to the sound field in shallow water with soft bottom, are selected and treated by reasonable approximation. The expression of the interference structure of the middle and low frequency signal is given by means of ray analysis, and the expression is extended from the single frequency signal to the wideband signal and the linear frequency modulation signal. The relationship between the interference structure of sound field in shallow water and the parameters such as signal frequency, signal bandwidth, equipment placement depth and horizontal distance is obtained. Some characteristics and laws of the interference field in shallow water are obtained. The results of numerical simulation and actual test data show that these expressions can accurately reflect the fluctuating characteristics of the near range interference sound field under the condition of shallow water conventional measurement and test. The characteristics and laws of sound field deduced from the relational formula are also preliminarily verified.
【作者单位】：中国科学院声学研究所中国科学院水声环境特性重点实验室;山东理工大学计算机科学与技术学院;
【分类号】：TB525

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