| 徐盛瀛,范军,王斌.基于声学隧道效应的低频目标强度增强技术[J].声学技术,2020,39(1):34~39 |
| 基于声学隧道效应的低频目标强度增强技术 |
| Low frequency target strength enhancement based on acoustic tunnel effect |
| 投稿时间：2018-09-07 修订日期：2018-11-03 |
| DOI：10.16300/j.cnki.1000-3630.2020.01.006 |
| 中文关键词: 高分子聚合物 瑞利(Rayleigh)波 目标强度 声学隧道效应 |
| 英文关键词: polymethyl methacrylate (PMMA) Rayleigh wave target strength acoustic tunnel effect |
| 基金项目:国家自然科学基金青年科学基金项目（11504233） |
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| 中文摘要: |
| 高分子聚合物（Polymethyl Methacrylate，PMMA）材料的瑞利（Rayleigh）波相速度低于水中声速，是一类亚音速波，其声散射特性及形成机理与金属材料存在一定差异。根据弹性球散射声场简正级数解，对比分析了相同尺寸的PMMA球和钢球的目标强度，发现PMMA球在低频段具有较大的目标强度。采用亚音速波声学隧道效应和表面环绕波传播共振特性，对PMMA球中亚音速Rayleigh波形成的低频目标强度增强进行了物理机理解释和分析。最后，开展了PMMA球和钢球声散射水池试验，验证了PMMA球具备较大的低频目标强度以及分析结果的准确性。 |
| 英文摘要: |
| The acoustic scattering characteristics of polymethyl methacrylate (PMMA) material are different from those of metal materials. Since the phase velocity of Rayleigh wave in PMMA material is less than the sound speed in water, the scattering mechanism needs to be re-examined. The target strengths of the PMMA sphere and the steel sphere with the same size in water are compared based on the normal series solution of the elastic sphere scattering sound field. It is found that the former exhibits higher target strength at low frequencies. Based on the acoustic tunneling effect of subsonic wave and the resonance characteristics of surface surround wave propagation, the physical mechanism of the target strength enhancement at low frequencies caused by subsonic Rayleigh wave in PMMA sphere is explained and analyzed. Finally, the acoustic scattering experiments of PMMA sphere and steel sphere are carried out to verify the accuracy of the analysis results. |
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