Time-domain analysis and experimental examination of cumulative second-harmonic generation by primary Lamb wave propagation
Time-domain analysis and experimental examination of cumulative second-harmonic generation by primary Lamb wave propagation
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一次兰姆波传播累积二次谐波的时域分析和实验检验
DOI：
10.1063/1.3592672
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发表时间：
2011-06-01
影响因子：
3.2
通讯作者：
Liu, Liangbing
中科院分区：
文献类型：
--
作者：
Deng, Mingxi;Xiang, Yanxun;Liu, Liangbing
在二阶微扰近似下，在时域内研究了一次兰姆波传播产生累积二次谐波的物理过程。基于主兰姆波向倍频兰姆波的能量传递不为零和满足相速度匹配条件的前提，重点分析了群速度失配对有限持续时间主兰姆波音爆传播产生二次谐波的影响.我们的分析表明，产生的二次谐波的时域包络是依赖于传播距离时的主兰姆波音爆的持续时间和群速度失配给定。此外，可以得出结论，时域二次谐波的积分幅度，量化的二次谐波产生的效率，随着传播距离的增长，即使在格鲁。
Within the second-order perturbation approximation, the physical process of cumulative second-harmonic generation by the primary Lamb wave propagation has been investigated in the time domain. Based on the preconditions that the transfer of energy from the primary Lamb wave to the double frequency Lamb wave is not zero and that the phase velocity matching condition is satisfied, we focus on analyzing the influence of mismatching of the group velocities on the generation of the second harmonic by propagation of a primary Lamb wave tone burst with a finite duration. Our analysis indicates that the time-domain envelope of the second harmonic generated is dependent on the propagation distance when both the duration of the primary Lamb wave tone burst and the group velocity mismatch are given. Furthermore, it can be concluded that the integrated amplitude of the time-domain second harmonic, which quantifies the efficiency of the second-harmonic generation, grows with the propagation distance even when the grou...