Analysis of influence of beam Angle of array sound source on sound propagation in typical shallow sea
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摘要: 随着主动声呐技术的发展, 主动声呐的波束输出能力成为工程研究中的关注对象, 对于典型垂直线列阵声源, 研究其声信号波束角变化对声传播的影响很有必要。文中基于声场简正波理论推导了阵列声源下声场信号表达式, 发现了声场信号主要受阵列声源在各阶模态的波束输出和接收深度上的模态幅度采样两者影响, 仿真表明波束声信号在接收深度上有明显的强弱分布结构, 以及随声源深度增大最优波束角偏离0°的现象。文中基于推导的声场公式对现象机理进行了解释, 进而给出了典型浅海环境下不同声呐收发位置关系下的最优波束角设计建议, 为主动声呐声源波束设计研究提供了指导, 为主动声呐合理收发位置布设提供了思路。Abstract: With the development of active sonar technology, the beam output capability of active sonar has become the focus of research. It is necessary to study the influence of the sound signal beam angle on sound propagation for a typical vertical linear array sonar. Based on the theory of normal modes, the paper derives the expression of the sound signal for an array sound source and discovers that the sound signal is mainly affected by the following two factors: the beam output of the array sound source at each modal mode and the modal amplitude sampling at the receiving depth. Simulation results show two phenomena: a clear distribution structure of the sound signal in the receiving depth and a deviation of the optimal beam angle from 0° as the sound source depth increases. The paper explains the mechanism of the two phenomena based on the derived sound field formula and gives design suggestions for the optimal beam angle under different sonar transmit and receive position relationships in typical neritic environment, providing reference for the active sonar sound beam design research and providing ideas for the rational deployment of the active sonar.
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Key words:
- active sonar /
- array source /
- beam directivity /
- source emission angle /
- neritic environment
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图 1 阵列声源输出指向性信号示意图
Figure 1. Schematic diagram of directional signal output from array sound source
图 3 不同声源深度时传播损失在接收深度上的变化
Figure 3. The variation of propagation loss at different depths of sound sources in terms of receiving depth
图 4 不同接收深度上传播损失随声源深度的变化
Figure 4. The variation of propagation loss with the depth of the sound source at different receiving depths
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