文章摘要
范军,刘涛,汤渭霖.水下目标壳体的镜反射亮点回波结构[J].声学技术,2002,(4):153~157,170
水下目标壳体的镜反射亮点回波结构
The structure of highlight echoes due to specular reflection from shells of immerged target
投稿时间:2000-06-19  修订日期:2000-10-20
DOI:
中文关键词: 水下目标  镜反射  亮点  回波结构
英文关键词: immerged target  specular reflection  highlight  the structure of echoes
基金项目:
作者单位
范军 上海交通大学振动、冲击、噪声国家重点实验室, 上海, 200030 
刘涛 上海交通大学振动、冲击、噪声国家重点实验室, 上海, 200030 
汤渭霖 上海交通大学振动、冲击、噪声国家重点实验室, 上海, 200030 
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中文摘要:
      文章从工程应用角度讨论水下目标壳体镜反射亮点回波结构。在声呐频率范围内把水下目标壳体作为多层平板处理。应用声线方法和递推关系导出任意多层平板的反射系数。忽略耦合水层两边的多次反射后,得到一组适合于瞬态和亮点分析的反射系数近似公式。利用这组公式依次讨论了:(1)未敷设吸声覆盖层的单层壳体;(2)未敷设吸声覆盖层的双层壳体;(3)敷设吸声覆盖层的单层壳体;(4)敷设吸声覆盖层的双层壳体等4种情况的镜反射亮点回波结构。并给出了数值计算的算例。
英文摘要:
      The structure of specular reflection highlight sechoes from shells of immerged target is discussed in the field of engineering application. In range of sonar frequency,shells of immerged target can be treated as multi-layer plates. In use of ray acoustics and recursion relation, the sound reflection coefficients of arbitrarily many plates have been derived. When multi-reflection is neglected,a series of approximate formulas that are fit for analyzing transient case and the structure of highlight echoes are obtained. In use of the approximate formulas, the structure of specular reflection highlight echoes from four kinds of shell structures are discussed, (1)single shell no-covered with sound-absorbing layer, (2)double shells no-covered with sound-absorbing layer, (3)single shell covered with sound-absorbing layer, (4)double shells covered with sound-absorbing layer. The numerical examples are shown.
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