| 水下弹性圆柱的共振散射 |
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| 引用本文： | 蒋廷华, 王润田, 周根祥, 吴志灏, 徐哲, 冯绍松. 水下弹性圆柱的共振散射[J]. 声学学报, 1990, 15(4): 265-271. DOI: 10.15949/j.cnki.0371-0025.1990.04.005 |
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| 作者姓名： | 蒋廷华 王润田 周根祥 吴志灏 徐哲 冯绍松 |
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| 作者单位： | 中国科学院声学研究所(蒋廷华，王润田，周根祥，吴志灏，徐哲)，中国科学院声学研究所(冯绍松) |
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| 摘 要： | 当声波频率与水下弹性圆柱的某一模式的共振频率相符时,圆柱受声波激励产生的共振振动向周围介质辐射的声波最强。国内、外研究表明,对一般的金属圆柱而言(其弹性纵波与切变波速度大于水中声速),在与入射波方向相反的方向上,由于这种辐射声波与圆柱表面的几何反射波位相相反,因此两者干涉的结果形成了在共振频率上出现反向散射声振辐的极小值。本文揭示了一种新的情况,即对于弹性切变波波速小于水中声速的一种材料做成的圆柱体,无论是理论计算和实验测量,均表明在共振频率上出现反向散射振幅的极大值。
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| 收稿时间： | 1989-03-04 |
The resonance scattering of underwater elastic cylinders |
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| JIANG Tinghua, WANG Runtian, ZHOU Genxiang, WU Zhihao, XU Zhe, FENG Shaosong. The resonance scattering of underwater elastic cylinders[J]. ACTA ACUSTICA, 1990, 15(4): 265-271. DOI: 10.15949/j.cnki.0371-0025.1990.04.005 |
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| Authors: | JIANG Tinghua WANG Runtian ZHOU Genxiang WU Zhihao XU Zhe FENG Shaosong |
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| Abstract: | If the frequency of the incident sound wave coincides with one of the eigenfre-quencies of the underwater elastic cylinder, the corresponding eigenvibration will appear excited by the incident sound wave and then strongly reradiate sound wave towards surrounding water. It has been revealed by previous investigations that the amplitude of backscattering sound appears to be minimum at the eigenfrequencies of the underwater metallic cylinders because of the destructive interference between reradiated wave of the eigen vibration and the geometrical reflected wave from surface of the cylinders. In this paper, a new p enomenon has been revealed. The amplitude of back scattering sound appears to be maximum at t e eigenfrequencies of a cylinder made from non-metallic material in which the velocity of elastic transverse wave is less than the sound velocity in water. |
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