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采用有限元仿真模拟了SH超声导波检测储油罐底板损伤过程,通过细化模型的单元尺寸和时间步长确保模拟结果的准确度。经过Matlab频谱分析选择10个单音频数70 kHz经Hanning窗调制后的信号作为激励信号,对储油罐底板无缺陷、通孔缺陷、裂缝缺陷、腐蚀坑缺陷进行有限元仿真模拟,通过分析超声导波回波信号的信噪比,可以准确定位缺陷位置和几何特征,为SH超声导波检测技术应用提供了有力的理论支持。
The finite element simulation was used to simulate the SH ultrasonic guided wave detection of the tank bottom damage process and to ensure the accuracy of the simulation results by refining the unit size and time step of the model. Through the spectrum analysis of Matlab, 10 signals of 70 kHz single-tone frequency modulated by Hanning window were selected as the excitation signals, and the finite element simulation of defect on the floor of the oil tank, through hole defects, crack defects and pit corrosion was selected. The signal-to-noise ratio of the guided-wave echo signal can accurately locate the position and the geometric characteristics of the defect, which provides a powerful theoretical support for the application of SH ultrasonic guided wave detection technology.