三列不同相位原波形成的参量阵声场研究

摘要

参量阵能生成低频、高指向性声束，在海底地层剖面测量、掩埋目标探测与识别、水下通信等水声工程领域有着广泛的应用。理论研究表明，当三列原波相互作用时，能形成具有两个差频分量的参量阵辐射系统，但尚未有文献对受原波相位影响的多频参量阵声场进行系统分析。基于此，本文综合计算精度和效率的需求，借鉴算子分离思想，利用时频域相结合的方法求解KZK方程，实现对三列不同相位原波相互作用形成的参量阵声场的描述。计算结果表明：参量阵差频信号的声压幅值随着原波相位的改变而改变，并且原波相位均为零时，两个差频分量的声压幅值最大。最后进行了试验研究，实验结果与仿真结果吻合较好。%A parametric array can generate an acoustic beam of low frequency and high directivity. This has been widely used in acoustics engineering including seafloor profile measurement, buried underwater target detection and recognition, and underwater communications. Theoretical studies have shown that the interaction of three collimated primary waves can produce a parametric array radiation system with two difference frequencies. However, no sys⁃tematic analysis has been done of a multi⁃frequency parametric array acoustic field affected by the primary wave phase. To ensure the precision and calculation efficiency of the computation, this study drew on ideas from operator separation, combining the time domain with the frequency domain to solve the KZK equation for the parametric ar⁃ray, thereby achieving a description of a parameter array acoustic field formed by the interaction of three collimated primary waves with different phases. The simulation results showed that the sound pressure amplitude of the para⁃metric array changed with a change in the primary wave phases. The sound pressure amplitude of the parametric ar⁃ray difference frequency component was largest when the primary wave phase was zero. Finally, the experimental study and the simulation produced identical results.