ABOUT INFLUENCE OF PARAMETERS OF A WEAR PLATE OF THE NORMAL PROBE ON CHARACTERISTICS FREQUENCY A SPECTRUM AND A PULSE OF A BOTTOM SIGNAL

Kontrol'. Diagnostika Pub Date : 2022-04-01 DOI:10.14489/td.2022.04.pp.004-012

V. Danilov

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Abstract

Computer modelling of an acoustic channel of the normal probe for a reflector as a bottom surface has shown, that increase of amplitude of a pulse echo signal, registered by the probe with a wear plate from epoxy resin with fine – dispersed filler due to increase of its contents, causes reduction of speed of longitudinal waves in a wear plate with the appropriate downturn of the first resonant frequency owing to what the spectrum of a signal may vary essentially. Reception of short pulses, on amplitude of same duration considerably surpassing pulses for protectors from epoxy resin with filler, is provided with application of a protector from mineral ceramics, having own lowest resonant frequency is much higher than the basic own frequency piezo plate. Comparison of experimental and theoretical pulses and spectra of ground signals for direct converters with qualitatively distinguished protectors has confirmed an opportunity of presence of the several expressed maxima of a spectrum of a pulse with oscillating modulation of amplitude for a wear plate from epoxy resin with filler with low speed of distribution of longitudinal waves.

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关于普通探头磨损盘参数对底部信号特征频率、频谱和脉冲的影响

计算机模拟的声学通道直探头反射器作为底面表明,脉冲回波信号的振幅增加,注册的探针与环氧树脂耐磨护板与细分散填料由于其内容的增加,导致减少纵向波的速度穿板与适当的第一共振频率由于低迷的光谱信号本质上可能会有所不同。采用矿物陶瓷保护器，其自身的最低谐振频率远高于压电板的基本频率，提供了接收短脉冲的能力，其振幅相同的持续时间大大超过填充环氧树脂保护器的脉冲。对具有定性区分保护器的直接变流器的实验脉冲和理论脉冲以及地面信号的频谱进行比较，证实了在纵向波分布速度较低的环氧树脂填充的磨损板中，具有振幅振荡调制的脉冲频谱的几个表示最大值的可能性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Kontrol'. Diagnostika

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