The Metal Magnetic Memory Testing Based on Wavelet Packet Energy Spectrum

The wavelet packet energy spectrum analysis method of magnetic memory signals was proposed. On the theoretical basis of wavelet packet transform, by carrying out stretching experiments on specimens of 45 steel and aeronautical ferromagnetic material 18CrNi4A, magnetic memory signals under different loads on the surface of the specimens were acquired and analysed with wavelet packet energy spectrum. Thus the stress concentration area and its extent of the specimens could be judged effectively.