Techno Press

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

Abstract     [Full Text]
    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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