论文部分内容阅读
基于射线理论分析了在典型深海情况下声源与接收水听器位于海水表层时声场频率-距离干涉结构,给出了直达声作用区与影区情况下声场频率-距离干涉结构的近似理论表达式。数值仿真与实验结果表明:在直达声作用区内,由直达声与海面一次反射声形成声场干涉结构,频率域干涉周期为该两条声线到达时间差的倒数;在影区内,由声源-海底-接收器、声源-海面-海底-接收器、声源-海底-海面-接收器和声源-海面-海底-海面-接收器四条声线形成声场干涉结构,声强随着频率具有两种干涉周期,分别随着声源深度、接收水听器深度的增大而减小,并与收发距离有关。本文给出的理论表达式可以较好的解释实验观测到的声场频率-距离干涉结构。
Based on the ray theory, the frequency-distance interference structure of the sound field when the source and the receiving hydrophone are located on the surface of seawater under typical deep sea conditions is analyzed. The approximate theoretical expression of the frequency-distance interference structure of the sound field in the direct sound zone and the shadow zone is given formula. The numerical simulation and experimental results show that the sound field interference structure is formed by the direct sound and the primary reflected sound in the region of direct sound, and the interference period in the frequency domain is the reciprocal of the difference between the arrival times of the two sound waves. In the shadow region, --Sea - Receiver, Sound Source - Sea Surface - Seabed - Receiver, Sound Source - Seabed - Sea Surface - Receiver and Sound Source - Sea Surface - Seabed - Sea Surface - Receiver The four sound rays form a sound field interference structure with sound intensity varying with frequency There are two kinds of interference periods, which decrease with the depth of the sound source and the depth of the receiving hydrophone, respectively, and are related to the receiving and sending distance. The theoretical expression given in this paper can better explain the experimentally observed sound field frequency-distance interference structure.