A system of impact damage detection for composite material structures by using an intelligent sensor embedded in composite material is described.In the course of signal processing,wavelet transform has the exceptional property of temporal frequency localization, whereas Kohonen artificial neural networks have excellent characteristics of self-learning and fault-tolerance. By combining the merits of abstracting time-frequency domain eigenvalues and improving the ratio of signal to noise in this system,impact damage in composite material can be properly recognized.
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