孔洞对透射波频谱影响的有限元数值模拟

Finite Element Simulation to the Effect of Transmission Spectrum by Holes

摘要: 从有限元基本原理出发, 建立固体中二维有限元模型。对含有孔洞缺陷模型的声波散射进行了数值模拟研究, 通过波场快照图能清晰显示孔洞对超声波传播的影响, 对时域A-扫描曲线上透射波到达时间进行计算, 验证了结果的正确性。重点对透射波进行了频谱分析, 通过频域特征量和敏感频率可以识别出不同尺寸的孔洞。

Abstract: Based on the principle of the finite element method, a two-dimensional finite element model with a hole is studied by simulation. The snapshots display the effect to ultrasonic propagation by a hole, and the accuracy of results is confirmed by the A-scan curves. With the characteristics of frequency and the sensitivity frequency obtained from the spectral analysis of the transmission information, we can recognize the different size of holes.