Time-Domain Second-Harmonic Generation of Primary Lamb-Wave Propagation in an Elastic Plate
Time-Domain Second-Harmonic Generation of Primary Lamb-Wave Propagation in an Elastic Plate
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DOI：
10.1088/0256-307x/28/7/074301
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发表时间：
2011-07
影响因子：
3.5
通讯作者：
Deng Mingxi;Xiang Yanxun;Liu Liang-bing
中科院分区：
文献类型：
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作者：
Deng Mingxi;Xiang Yanxun;Liu Liang-bing
我们给出了一次兰姆波短脉冲传播产生二次谐波的实验观测结果。对于主频兰姆波和倍频兰姆波满足相速度匹配而群速度匹配不满足的情况，我们的观测清楚地表明，二次谐波的持续时间及其积分幅度随着传播距离的增加而增加。这一实验结果与理论预测是一致的，表明群速度匹配并不是一次兰姆波传播产生累积时间域二次谐波所必需的。
We present an experimental observation of the generation of the time-domain second harmonic by propagation of the primary Lamb-wave tone-burst. For a case where the phase velocity matching between the primary and the double frequency Lamb waves is satisfied but the group velocity matching between them is not, our observation clearly shows that the duration of the time-domain second-harmonic tone-burst, as well as its integrated amplitude, increases with the increasing propagation distance. This experimental result is consistent with the theoretical prediction and demonstrates that group velocity matching is not absolutely necessary for the generation of the cumulative time-domain second harmonic by primary Lamb-wave propagation.