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.
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