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用 A型显示脉冲超声波探伤仪 ,获得 JB/T1 0 0 62 -1 999标准 DB-H1试块中不同深度横通孔的超声回波连续模拟信号 ,再经采样得到数字化超声回波时域信号 ,最后应用信号分析与处理技术对数字化超声回波时域信号的拟合进行了初步探索。研究结果表明 :用指数周期趋势数学模型与 P阶自回归 (AR(P) )数学模型的叠合形式能达到较好的拟合效果
A-type pulse ultrasonic flaw detector was used to obtain ultrasonic echo continuous analog signal of horizontal depth through hole of JB / T1 0 0 62 -1 999 standard DB-H1 test block, and then the digital ultrasound echo time-domain signal Finally, the application of signal analysis and processing techniques to digital ultrasonic echo time domain signal fitting preliminary exploration. The results show that the better fitting effect can be achieved by the combination of exponential periodic trend mathematical model and P order autoregressive (AR (P)) mathematical model