啁啾声
声学
信号(编程语言)
激发
材料科学
兰姆波
带宽(计算)
低频
频率响应
物理
光学
计算机科学
电信
波传播
工程类
电气工程
激光器
量子力学
程序设计语言
作者
Anvesh R. Nandyala,Ashish K. Darpe,Shveta Singh
标识
DOI:10.1177/14759217221076736
摘要
When a narrowband tone burst excitation signal is used to generate Lamb waves in the thin composite plates, a suitable frequency of the excitation signal is typically chosen to excite a solitary mode of Lamb wave in the structure. However, if and as the damage severity changes in the structure, it may be possible that the frequency of the excitation signal may influence the response metric. In the present work, the use of a chirp signal as an excitation signal for damage severity assessment is proposed. The use of a chirp signal as an excitation signal may prove suitable for damage severity assessment because the chirp response contains a large frequency bandwidth, and the cumulative effect of all the frequencies with the delamination is reflected in the damage index. The sensitivity of the chirp response to varying delamination sizes is investigated through numerical simulations and experiments. The damage index calculated using the chirp response showed a monotonic trend with an increase in damage severity, in contrast to a bidirectional trend of the damage index when conventional narrow excitation signals are used.
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