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Smart Structures and Systems
  Volume 1, Number 3, September 2005, pages 257-266

Wideband Lamb wave analysis based on continuous wavelet transform
Lihua Shi,Xinwei Wang, Gang Li and Lingyan Zhang

    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.
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

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