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本文将球及圆柱形目标的回波声场简化为几何镜反射波与弹性瑞利表面再辐射回波两者的叠加,由此得到了与精确计算结果基本一致的弹性球回波稳态频响曲线,并着重讨论了振幅和相位的频响曲线中极值点(峰、谷)频率与目标共振频率之间的偏离程度,振幅和相位对频率导数的频响曲线中极值点频率与共振频率间的偏离程度,以及这种偏离与目标材料和频率的关系.此外,还讨论了当存在目标以外的干扰回波时,上述频响曲线中极值点频率的稳定性.
In this paper, the echo sound field of spherical and cylindrical targets is simplified to the superposition of the geometrical mirror reflected wave and the elastic Rayleigh surface reradiation echo, and the elastic ball echo steady-state frequency response that is basically consistent with the exact calculation result is obtained. Curve and focuses on the amplitude and phase frequency response curve extremum (peak, valley) frequency and the target resonance frequency deviation between the amplitude and phase of the frequency derivative of the frequency response curve in the extreme point frequency and resonance Frequency, and the relationship between this deviation and the target material and frequency.In addition, the stability of the extremum frequency in the frequency response curve is also discussed when there is an interference echo outside the target.