Generation of flexural waves in plates by laser-initiated airborne shock waves
Generation of flexural waves in plates by laser-initiated airborne shock waves
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DOI：
10.1016/j.jsv.2010.08.005
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发表时间：
2011-01-17
影响因子：
4.7
通讯作者：
Attenborough, Keith
中科院分区：
文献类型：
--
作者：
Georgiev, Vasil B.;Krylov, Victor V.;Attenborough, Keith
提出了激光引发的空气冲击波与无限水平放置的弹性板相互作用的半解析模型的结果。空气传播的冲击波对板上的影响近似为由入射冲击波和反射冲击波的压力产生的圆柱形发散表面力。然后通过汉克尔和傅里叶变换在波数频域中表示该力，并进行数值计算，以便可以使用格林函数方法解决相互作用问题。针对不同的激光脉冲能量值和聚焦在板表面上方的激光束的不同高度，计算所产生的弯曲波脉冲的频谱和时间历程。将获得的理论结果与激光产生的声冲击与大塑料板相互作用的实验室测量结果进行比较。比较显示半分析预测和数据之间相当良好的一致性。 (C) 2010 Elsevier Ltd. 保留所有权利。
Results of the semi-analytical modelling of the interaction of laser-initiated airborne shock waves with an infinite horizontally positioned elastic plate are presented. The impact of the airborne shock waves on the plate is approximated by a cylindrically diverging surface force resulting from the pressure of the incident and reflected shock waves. This force is then represented in the wavenumber-frequency domain by means of Hankel and Fourier transforms that are carried out numerically so that the interaction problem can be solved using the Green's function method. The resulting frequency spectra and time histories of generated flexural wave pulses are calculated for different values of laser pulse energy and for different heights of the laser beam focusing above the plate surface. The theoretical results obtained are compared with the results of laboratory measurements of the interaction of laser-generated acoustic shocks with a large plastic plate. The comparison shows reasonably good agreement between the semi-analytical predictions and data. (C) 2010 Elsevier Ltd. All rights reserved.