Smart Structures and Systems

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Wideband Lamb wave analysis based on continuous wavelet transform

  • Shi, Lihua (Laboratory of Electromagnetics, Nanjing Engineering Institute) ;
  • Wang, Xinwei (The Aeronautical Science Key Laboratory for Smart Materials and Structures, Nanjing University of Aeronautics and Astronautics) ;
  • Li, Gang (The Aeronautical Science Key Laboratory for Smart Materials and Structures, Nanjing University of Aeronautics and Astronautics) ;
  • Zhang, Lingyan (Laboratory of Electromagnetics, Nanjing Engineering Institute)
  • Received : 2004.08.30
  • Accepted : 2005.04.29
  • Published : 2005.09.25
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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.

Keywords

Acknowledgement

Supported by : Chinese Natural Science Foundation

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