模拟井水中接收的声发射信号波形特征

Waveform Characteristics of Acoustic Emission Signals through the Simulation System of Well Water

采用全波形声发射信号分析仪接收由声波发生器在模拟水井底部激发的声发射(AE)信号,对其波形进行了时域分析、频域分析及小波变换,并与不经任何传播介质直接被接收的AE信号进行对比。结果表明,经模拟水井系统传播后,AE信号的幅度、振铃计数、总能量均明显下降,而持续时间则相对增加;两者经小波变换后的各分解层能量比例基本一致。

The acoustic emission signal excited on the simulated well bottom and transmitted through the well water was received by using a full wave acoustic emission signal analyzer, and the time domain analysis, frequency domain analysis and wavelet transform were used to analyse these waveforms of the AE signals. These simulated AE signals were also compared with the signals directly received by the AE signal analyzer. The results showed that the amplitude, ringdown count, and the total energy of the simulated AE signals decreased obviously through the well simulation system, but the duration times was relatively increased. The energy ratio of each decomposed level for two kinds of the AE signals was consistent after the wavelet transform.