摘要
利用小波包分析技术对碎片云撞击载荷作用下铝合金板声发射信号的能量分布特征进行了研究。首先,介绍了碎片云撞击信号的获取方案及撞击引起的损伤情况;其次,对获取的声发射信号进行小波包分析,得到了信号在频率带上能量分布特征图。最后,讨论了碎片云撞击损伤特征与声发射信号能量分布的关系。分析结果发现,对于相同质量的弹丸,随着其破碎程度的提高,形成的碎片云对后板的损伤程度减少;弹丸具有的初始速度越大,弹丸破碎越完全,碎片云撞击声发射信号中的能量越小;当弹丸破碎程度低时,碎片云撞击引起的声发射信号能量集中在约488kHz以下;弹丸破碎程度越高,信号中488kHz以上的能量所占总能量的比例越大。
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.
关键词
碎片云撞击 /
声发射信号 /
小波包分析 /
能量分布
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Key words
debris cloud impact /
acoustic emission signals /
wavelet packet analysis /
energy distribution
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张凯;庞宝君;林敏.
碎片云撞击声发射信号能量特征小波包分析[J]. 振动与冲击, 2012, 31(12): 125-128
Zhang kai;Pang bao-jun;Lin min.
Wavelet packet method for the analysis of acoustic emission signals caused by debris cloud impact[J]. Journal of Vibration and Shock, 2012, 31(12): 125-128
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