分层介质波导中的声矢量场传播  

Acoustic vector fields propagation in horizontal-stratified waveguide

作　　者：周士弘 

机构地区：[1]大连测控技术研究所,辽宁大连116013

出　　处：《哈尔滨工程大学学报》2004年第1期38-42,共5页Journal of Harbin Engineering University

基　　金：水声技术国防科技重点实验室基金资助项目(51444030201).

摘　　要：目前,矢量传感器在水声测量的探测技术中的应用已逐渐受到重视,但所采用的声压p和振速(Vx,Vy,Vz)联合处理技术还是建立在假定海洋波导中各位置处的声波阻抗数值都相同且为实数的基础上,而海洋环境效应的作用将不同程度地导致矢量处理器性能的降低.从实际应用的需求出发从理论上研究浅海分层介质波导中声压和振速场的传播特性,分析了声波阻抗率与频率、声源和接收器水平距离间的变化关系.理论分析和计算结果表明,只有在远场条件下,声压和水平振速信号才趋向于同相位;在通常噪声测量要求的距离上,声压和水平振速的传播损失相当,但必须注意声压和水平振速间的相位差随频率和声源距离的变化,而声压p和振速垂直分量Vz比值的模和相位差随频率和距离的变化复杂.The application of vector hydrophones for underwater acoustic measurement and detection is attracting more and more attention.However,the introduced signal processing approach using combined sound pressure p and vibration velocity components (V_x,V_y,V_z),which is based on constant acoustic impedance at different locations in sound waveguides,ignores the environmental effect on vector processing performance.In this paper,the acoustic vector fields propagation in horizontal-stratified waveguide is studied theoretically.The dependence of the acoustic impedance on frequency and horizontal distance between sound source and receivers is presented.Analyses and simulation show that phase of p and horizontal vibration velocity components V_r tends to consistency at condition of far-field propagation and their transmission losses are equally matched.However,the dependence of phase between p and V_r on frequency and horizontal distance between source and receivers must receive attention.Moreover,the complex ratio of sound pressure p and vertical vibration velocity component V_z strongly depends on frequency and range.

关 键 词：分层介质波导 声压 振速 声波阻抗 声矢量场传播 水声测量 矢量传感器 

分 类 号：O427.1[理学—声学] TB566[理学—物理]