深水和浅水水下爆炸声的数值研究。

IF 2.1 2区 物理与天体物理 Q2 ACOUSTICS
E M Salomons, J T Tuitman, A M von Benda-Beckmann, G N Peixoto Dourado
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引用次数: 0

摘要

建立了水下爆炸声的数值模型。对于传播距离通常为300米的情况,采用有限元方法(FEM)模型。对于更大范围的传播,通常达到10公里,使用抛物方程(PE)模型。有限元模型考虑了水层中炸药的存在。计算出的波形包含了直接激波、地表反射和沉积物反射。有限元法考虑了非线性声学效应,而有限元法忽略了非线性声学效应。有限元法还考虑了地表附近的空化现象。对于含有100 kg三硝基甲苯(TNT)的深水情景,将模型结果与经验Weston关系和Kirkwood-Bethe理论进行了比较。比较的重点是非线性传播效应。对于含有263 kg TNT的浅水情景,将模型结果与北海的实验数据进行了比较。宽频声暴露水平得到了很好的一致性,而对于频谱,由于数值耗散,在高频处出现偏差。将模型计算结果与浅水模式剥离公式计算结果进行了比较,结果相差约10 dB。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical study of sound of underwater explosions in deep water and shallow water.

A numerical model has been developed for sound generated by underwater explosions. For propagation up to a distance of typically 300 m, a finite-element method (FEM) model is used. For propagation to larger ranges, up to typically 10 km, a parabolic equation (PE) model is used. The FEM model takes into account the explosive material in the water layer. The calculated waveform contains the direct shock wave and surface and sediment reflections. Nonlinear-acoustics effects are taken into account by FEM, but are neglected by PE. FEM also accounts for cavitation near the surface. For a deep-water scenario with 100 kg trinitrotoluene (TNT), model results are compared with the empirical Weston relationships and with the Kirkwood-Bethe theory. The comparison focuses on nonlinear propagation effects. For a shallow-water scenario with 263 kg TNT, model results are compared with experimental data for the North Sea. Good agreement is obtained for the broadband sound exposure level, while for the spectrum, deviations occur at high frequency, as a result of numerical dissipation. The model results are also compared with results calculated with the mode-stripping formula for shallow water, which yields a difference of about 10 dB.

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来源期刊
CiteScore
4.60
自引率
16.70%
发文量
1433
审稿时长
4.7 months
期刊介绍: Since 1929 The Journal of the Acoustical Society of America has been the leading source of theoretical and experimental research results in the broad interdisciplinary study of sound. Subject coverage includes: linear and nonlinear acoustics; aeroacoustics, underwater sound and acoustical oceanography; ultrasonics and quantum acoustics; architectural and structural acoustics and vibration; speech, music and noise; psychology and physiology of hearing; engineering acoustics, transduction; bioacoustics, animal bioacoustics.
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