In this paper, based on the deformed cylinder method, the expression of the far-field acoustic scattering form function of a finite-length elastic elliptical cylinder is obtained. The target strength of elastic aluminum and polymethylmethacrylate (PMMA) elliptical cylinders, with different lengths varying with dimensionless frequency $ka$, is studied for different incident angles. In addition, the change of the target strength of a PMMA elliptical cylinder with incident angle is explored theoretically and experimentally when the frequency range is 20–40 kHz. Simulation results show that there is almost no change in the peak of the curve of the backscattering target strength versus frequency for a finite-length elastic elliptical cylinder with different lengths. As the length decreases, the target strength gradually decreases. When the theoretical simulation results are compared with the experimental results, it is found that the theoretical predictions are in good agreement with the experimental results. Furthermore, the study will provide theoretical and experimental basis for the prediction and recognition of underwater targets.

中文翻译：

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平面波中有限长弹性椭圆柱的声散射

本文基于变形圆柱体方法，得到了有限长弹性椭圆圆柱体远场声散射形式函数的表达式。不同长度随无量纲频率变化的弹性铝和聚甲基丙烯酸甲酯（PMMA）椭圆圆柱的目标强度$克\mathrm{一种}$, 针对不同的入射角进行研究。此外，当频率范围为 20-40 kHz 时，从理论上和实验上探讨了 PMMA 椭圆柱的目标强度随入射角的变化。仿真结果表明，对于不同长度的有限长度弹性椭圆圆柱，背向散射目标强度随频率变化曲线的峰值几乎没有变化。随着长度的减少，目标强度逐渐降低。将理论模拟结果与实验结果进行对比，发现理论预测与实验结果吻合较好。此外，该研究将为水下目标的预测和识别提供理论和实验依据。