超声Lamb波二次谐波发生效率分析与模式选择

发布时间：2018-06-04 22:34

本文选题：二次谐波发生 + Lamb波　；参考：《声学学报》2017年03期

【摘要】：在导波模式展开分析方法的基础上,提出激发效率参量来定量表征超声Lamb波积累二次谐波的发生效率。以P92钢板为例,理论计算得到了与频散曲线对应的理论激发效率参量分布图谱,从图谱中选择理论激发效率参量大小不同的两种基频Lamb波模式:纵波型S1模式和交点型A2/S2模式,分别测量这两种基频Lamb波模式在钢板中传播时产生的二次谐波信号。理论计算和实验测量结果表明,这两种基频Lamb波模式的理论和实验激发效率参量的比值基本一致,且激发效率参量较大的纵波型S1模式能激发出效率更高的二次谐波信号。研究结果表明激发效率参量可以有效的用于Lamb波二次谐波发生效率的表征及模式选择。
[Abstract]:Based on the analysis of guided wave mode expansion, the excitation efficiency parameter is proposed to quantitatively characterize the efficiency of second harmonic generation of ultrasonic Lamb wave accumulation. Taking P92 steel plate as an example, the distribution of theoretical excitation efficiency parameters corresponding to the dispersion curve is obtained by theoretical calculation. Two fundamental frequency Lamb wave modes with different theoretical excitation efficiency parameters are selected from the spectrum: P-wave S1 mode and intersection A2/S2 mode. The second harmonic signals produced by the two fundamental frequency Lamb wave modes propagating in the steel plate were measured respectively. The theoretical calculation and experimental results show that the ratio of the theoretical and experimental excitation efficiency parameters of the two fundamental frequency Lamb wave modes is basically the same, and the P-wave type S1 mode with higher excitation efficiency parameters can excite the second harmonic signal with higher efficiency. The results show that the excitation efficiency parameters can be effectively used to characterize the second harmonic generation efficiency of Lamb waves and to select modes.
【作者单位】：华东理工大学;后勤工程学院;
【基金】：国家自然科学基金项目(51325504,11474093,11474361,11622430) 国家重点研发计划课题子任务(2016YFC0801903)资助
【分类号】：TB55

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