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A model for the acoustic behavior of plastic blast-hardened anti-tank landmines.

机译:喷砂硬化的反坦克地雷的声学行为模型。

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摘要

Mechanical resonances in landmines are often exploited by acoustic landmine detection schemes. This work, therefore, focuses on a single plastic, blast-hardened, anti-tank landmine, the Italian VS 1.6. Modal analysis experiments show seven modes below 1.6 kHz in the pressure plate of the VS 1.6. Also observed is a large shift of the first symmetric mode such that it occurs at a frequency higher than that of the first asymmetric mode.{09}With the exception of the first symmetric mode, the landmine's modes are adequately modeled by an elastically supported, elastic plate of uniform thickness. The shift of the first symmetric mode is shown to be caused by a large volume below the pressure plate. Simulated burial experiments in water exhibit downward shifts in modal frequency with depth that saturate at shallow depth. Similar experiments in sand show a re-ordering of modes upon flush burial of the landmine. Said phenomenon is qualitatively due to shear contact between the edge of the pressure plate and the sand. Burial simulation in sand on an acoustic simulant created to mimic the in-sand flush-buried modes of the VS 1.6 shows saturation of the shift in the first symmetric mode at a shallow depth of 4 cm.
机译:地雷中的机械共振通常被声学地雷探测方案所利用。因此,这项工作着眼于单一的塑料,经过爆炸硬化,反坦克的地雷,即意大利VS 1.6。模态分析实验显示,在VS 1.6的压板上,低于1.6 kHz的七个模式。还可以观察到,第一对称模式发生了较大的偏移,使得它的发生频率高于第一非对称模式的频率。{09}除了第一对称模式之外,地雷的模式可以通过弹性支撑得到充分建模,厚度均匀的弹性板。第一对称模式的移动被显示为由压板下方的大体积引起。在水中模拟的埋葬实验显示出模态频率的向下移动,深度随深度的增加而饱和。在沙子中进行的类似实验表明,在埋没地雷时,模式会重新排序。所述现象定性地归因于压板边缘和沙子之间的剪切接触。在模仿VS 1.6的砂内埋入式模式的声学模拟物中,在沙子中进行埋葬模拟表明,在4 cm的浅深度处,第一对称模式下的位移饱和。

著录项

  • 作者单位

    The University of Mississippi.;

  • 授予单位 The University of Mississippi.;
  • 学科 Military Studies.; Physics Acoustics.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 137 p.
  • 总页数 137
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 声学;
  • 关键词

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