Abstract：The feature of energy distribution in acoustic emission signals caused by debris cloud impact Aluminum alloy plate was investigated based on wavelet packet method.Firstly, the process to obtain the signals and the damage caused by debris cloud impact was introduced.Secondly, the signals were analyzed by using wavelet packet, and the change of energy distribution in different frequency bands was obtained. Finally, the relationship between the debris cloud impact damage characteristics and acoustic emission signals energy distribution was discussed. The results showed that for the same quality of projectile, the more completely broken of it, the debris cloud resulted less degree of damage on the plate. With higher initial speed, the projectile broken more completely, the signals caused by debris cloud impact had less energy. When the projectile was not completely broken, the acoustic emission signal energy concentrated bellow 488kHz; The proportion energy of the signal above 488kHz increased as the projectile broken more completely.
2012, Vol. 31 
