Finite Difference Modeling of Phased Array Ultrasonic Testing and its Application to the Identification of Mode Conversion
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摘要: 基于有限差分数值方法，建立相控阵超声检测数值模型。基于所建模型编程计算得到不同时刻相控阵探头发射声场分布图以及不同尺寸缺陷回波信号图。通过根部切槽相控阵检测试验验证了模型计算精度。利用斜切槽回波产生了山形波，并基于有限差分模型分析了各个波形产生的机理。结果表明，超声检测的数值模拟可以有效地用于变型波的识别。Abstract: The phased array ultrasonic testing model is built based on finite difference method, and the acoustic field of PA probe and the echo of different defects are calculated, the model is validated by mean of the experiment results of notch, a three peaks echo is achieved on a slit notchblock and the model is used to analyze the reason of every echo and the result indicates that numerical modeling of ultrasonic testing is an efficient tool for identification of mode conversion.
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