文章摘要
冯玉田,王荣庆,王朔中.水中目标强度的一致性时域有限差分计算[J].声学技术,2003,(1):4~7
水中目标强度的一致性时域有限差分计算
Uniform finite-difference time-domain method for underwater target strength estimation
投稿时间:2001-02-20  修订日期:2001-07-20
DOI:
中文关键词: 时域有限差分法  目标强度  散射
英文关键词: FDTD  target strength  scattering
基金项目:
作者单位
冯玉田 上海大学通信与信息工程学院, 上海, 200072 
王荣庆 中国船舶重工集团七六○研究所, 大连, 116013 
王朔中 上海大学通信与信息工程学院, 上海, 200072 
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中文摘要:
      本文应用一致性时域有限差分法(FDTD)和近场远场变换计算散射声目标的反射声压强度,找出反射声压级与目标声中心到换能器间距离的关系。数值计算中考虑了自由场和有海面及海面波浪影响时的不同情况。根据声源和目标的几何特征对入射波和散射波分别作了球面和柱面扩散修正,并将计算结果与水池实验结果进行了比较。本文的讨论可对水下目标强度测量方法提供参考。
英文摘要:
      Using the finite difference time-domain (FDTD) method and near field to far field transformation,pressure of the reflected sound from the scattering target is calculated.The aim is to find the relationship between the reflected sound pressure and the distance from the transducers to the target.In the calculation,both free field and surface bounded field with surface waves are considered.Spherical and cylindrical corrections are made based on the geometry of the source and the target.The calculated results are compared with the measured data.The method described may provide a means to aid the target strength measurement.
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