Abstract

The causes of fluctuations of the acoustic-impulse propagation velocity in a composite plate upon a change in the distance between the radiation source and a receiving transducer from 30 to 300 mm were studied. Methods for minimizing these fluctuations by reducing the influence of high-frequency wave-packet modes at the time of recording impulses by acoustic-emission transducers were developed. The use of the latter in determining the propagation velocity of a wave packet contributed to a decrease in fluctuations and stabilization of measurements in the diagnostic zones of the composite plate. These methods made it possible to reduce the velocity fluctuations by more than 30% compared to the standard calculation method.

中文翻译：

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确定复合材料波包速度时的误差减少

摘要

研究了当辐射源与接收换能器之间的距离从30 mm改变为300 mm时，复合板中声脉冲传播速度波动的原因。开发了通过在声发射换能器记录脉冲时减小高频波包模式的影响来最小化这些波动的方法。在确定波包的传播速度时使用后者有助于减少波动并降低复合板诊断区域中测量的稳定性。与标准计算方法相比，这些方法可以将速度波动降低30％以上。