浅海声场矢量物理特性及应用研究
文献类型：学位论文
| 作者 | 彭汉书 |
| 学位类别 | 博士 |
| 答辩日期 | 2007-06-08 |
| 授予单位 | 中国科学院声学研究所 |
| 授予地点 | 声学研究所 |
| 关键词 | 声场矢量 传播损失 声能流密度 水平纵向相关 匹配场 地声反演 |
| 其他题名 | Research on physics properties and application of the acoustic vector in shallow water |
| 学位专业 | 声学 |
| 中文摘要 | 随着矢量水听器制作工艺的不断改进以及矢量信号处理技术的不断成熟，关于矢量水听器的应用研究已经成为水声领域的一项重要研究内容，然而关于声场矢量物理特性的研究工作则不为多见。为了更好的了解与掌握浅海声场矢量的物理规律以及从水声物理角度阐述声场矢量可能的应用前景，本文主要做了下面的研究工作： 本文结合简正波理论研究了浅海声场矢量的传播规律。总结出在声场中的质点水平振速和声压的传播损失相似而质点垂直振速的衰减通常比二者要大的结论并给予了理论解释，同时结合数值算例和声场矢量传播实验给予了验证。 在声场矢量传播研究的基础上本文还进行了声场声能流密度的相关研究。初步研究表明，声场中声能流密度的大小主要取决于声场中声压和质点水平振速强度的大小，而声能流密度的传播方向则和声场中质点垂直振速强度的空间变化密切相关。 本文还对浅海声场中质点垂直振速和声压的水平纵向相关特性以及浅海噪声矢量的空间相关特性进行了初步研究，并结合算例给予了分析与总结。 最后，本文利用矢量水听器进行了浅海地声参数反演的应用研究。提出了利用矢量匹配场反演海底声速和利用质点垂直振速与声压的传播衰减差反演海底吸收的反演方法，并结合两次浅海声场矢量实验数据进行了地声参数的反演工作。实验数据表明，基于矢量水听器的海底参数反演方法主要具有下述优点：1）利用矢量匹配场反演海底声速能够有效减小海底声速估计误差；2）利用声场矢量传播损失差构造的目标函数对海底吸收反演有较高的灵敏度，同时还能够排除实验信号源级起伏对反演结果的干扰。 |
| 英文摘要 | With the improvement of the vector hydrophone’s manufacture skill and the development of the vector signal processing, the related research on the application of acoustic vector has been regarded as one of the most important issues in the field of underwater acoustics. As the research foundation of the acoustic vector, the research on physics properties of acoustic vector is little to be reported. To find out the physics properties well and illustrate the application of vector hydrophone from the view of physics properties, the following work is studied in this paper. First, according to the normal mode theory, the propagation characteristic of acoustic vector is discussed in this paper. The conclusion that the transmission loss of the vertical particle velocity is usually larger than that of the pressure and the horizontal particle velocity is obtained in this paper. And the according theoretical illustration is given. Furthermore, the simulative calculating example and the experimental results are provided to confirm the conclusion. Based on the propagation research of the acoustic vector field, the power fluxes in underwater acoustic field are also discussed in this paper. The intensity of the power fluxes is mainly decided by the pressure and the horizontal particle velocity and the propagation direction of the energy fluxes is up to the spatial variation of the vertical particle velocity. The horizontal longitudinal correlation of the acoustic vector and the spatial correction properties of noise vector are another research parts of this paper. And the according analysis is provided and discussed. Finally, as the application research on acoustic vector, a geoacoustic inversion scheme, which is based on the vector hydrophone array, has been proposed in this paper. With two successful experiments, the sediment sound speed and attenuation are inverted by the vector matched-field processing (MFP) and the transmission loss difference of the pressure and the vertical particle velocity respectively. The experimental results show that the inversion method based on the vector hydrophone mainly has two advantages: One is that the MFP method based on vector field can decrease the uncertain estimation of the sediment sound speed. The other is that the objective function based on the vector transmission loss difference has good sensitivity to the sediment attenuation and the inverted sediment attenuation is independent of source level. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 95 |
| 源URL | [http://159.226.59.140/handle/311008/152]  |
| 专题 | 声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文 |
| 推荐引用方式 GB/T 7714 | 彭汉书. 浅海声场矢量物理特性及应用研究[D]. 声学研究所. 中国科学院声学研究所. 2007. |
入库方式： OAI收割
来源：声学研究所
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