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Smart Structures and Systems Volume 1, Number 3, September 2005 , pages 257-266 DOI: https://doi.org/10.12989/sss.2005.1.3.257 |
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Wideband Lamb wave analysis based on continuous wavelet transform |
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Lihua Shi,Xinwei Wang, Gang Li and Lingyan Zhang
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| Abstract | ||
| In Lamb wave detection of damages in smart structures, the excitation pulse is usually designed as a narrow band burst wave for the convenience of analysis and recognition. However, the wideband excitation can excite more modes in plate/shell structure and thus provides extra information for changes of the structure. This paper presents a method that can extract information in wideband Lamb wave signals. By transforming the detected signals into various sub-frequency band, the measured signal can be converted to its equivalences of narrow band excitations, therefore, the information in different frequency bands can be acquired from a single test and in the same time the complicity of wideband signal can be simplified. Some test results are provided to verify this method. | ||
| Key Words | ||
| Lamb wave; wavelet transform; time-frequency analysis; damage detection; dispersion. | ||
| Address | ||
| Lihua Shi; Laboratory of Electromagnetics, Nanjing Engineering Institute, No.1 Haifuxiang, Nanjing 210007, China Xinwei Wang and Gang Li; The Aeronautical Science Key Laboratory for Smart Materials and Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China Lingyan Zhang; Laboratory of Electromagnetics, Nanjing Engineering Institute, Nanjing 210007, China | ||