Generation of Rayleigh-type Waves on Plate Edges by Laser-initiated Airborne Shock Waves
Generation of Rayleigh-type Waves on Plate Edges by Laser-initiated Airborne Shock Waves
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DOI：
10.3813/aaa.918343
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发表时间：
2010
影响因子：
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通讯作者：
V. Georgiev;V. Krylov;Q. Qin;K. Attenborough
中科院分区：
文献类型：
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作者：
V. Georgiev;V. Krylov;Q. Qin;K. Attenborough
本文描述了激光引发的空气冲击波与无限垂直安装的弹性板边缘相互作用的半解析模拟结果。冲击波对板边缘的影响通过入射冲击波和反射冲击波的组合压力产生的等效边缘力来近似。然后通过数字执行的傅里叶变换在波数-频域中表示该力。之后利用格林函数法求解问题。针对聚焦在板边缘上方的激光束的不同高度，计算了沿板边缘传播的生成的瑞利型波脉冲的频谱和时间历程。将获得的理论结果与激光引发的空气冲击波与大型垂直安装的有机玻璃板边缘相互作用的实验室实验结果进行比较，该实验用于爆炸波与地面相互作用的缩小规模建模。已考虑加速度计的谐振特性来描述接收到的信号。比较表明，所得半解析结果与实验结果吻合较好。
The present paper describes the results of the semi-analytical modelling of the interaction of laser-initiated air shock waves with the edge of an infinite vertically mounted elastic plate. The impact of the shock wave on the plate edge is approximated by an equivalent edge force resulting from the combined pressure of the incident and reflected shock waves. This force is then represented in the wavenumber-frequency domain by means of Fourier transforms that are carried out numerically. After that the problem is solved using the Green’s function method. The resulting frequency spectra and time histories of generated Rayleigh-type wave pulses propagating along the plate edge are calculated for different heights of the laser beam focusing above the plate edge. The obtained theoretical results are compared with the results of the laboratory experiments on laser-initiated air shock wave interaction with an edge of a large vertically mounted Perspex plate that is used for reduced-scale modelling of blast wave interaction with the ground surface. The resonant properties of the accelerometer have been taken into account to describe the received signals. The comparison shows that the obtained semi-analytical results are in good agreement with the experiments.