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With the purpose of on-line structural health monitoring,a transducer network was embedded into compos- ite structure to minimize the influence of surroundings.The intrinsic dispersion characteristic of Lamb wave makes the wavelet transform an effective signal processing method for guided waves.To get high precision in feature extrac- tion,an information entropy-based optimal mother wavelet selection approach was proposed,which was used to choose the most appropriate basis function for particular Lamb wave analysis.By using the embedded sensor network and extracting time-of-flight,delamination in the composite laminate was identified and located.The results demon- strate the effectiveness of the proposed methods.
With the purpose of on-line structural health monitoring, a transducer network was embedded into compos-ite structure to minimize the influence of ambient. The intrinsic dispersion characteristic of Lamb wave makes the wavelet transform an effective signal processing method for guided waves. To get high precision in feature extra- tion, an information entropy-based optimal mother wavelet selection approach was proposed, which was used to choose the most appropriate basis function for particular Lamb wave analysis. BY using the embedded sensor network and extracting time-of-flight delamination in the composite laminate was identified and located. The results demon- strate the effectiveness of the proposed methods.