摘要
利用小波包分析技术 ,先对信号进行分解 ,再对衰减的信号在不同频率段内进行有效的补偿 ,然后对分解的信号进行小波包重构 ,利用互相关技术计算出时差 ,进而进行声发射源定位。此定位方法能有效地减小声发射源定位的误差 ,提高定位精度。
Through wavelet packet analysis, signals are decomposed into a series of time-domain signals, each of which covers a specific octave frequency band. Then the effective compensations were given to the attenuated signals in different octave frequency band. After that, the signals were synthesized by wavelet packet analysis. Finally, the method of cross-correlation was applied to the synthesized signals to calculate the arrival time of AE waves to locate the source. It is shown that the accuracy of source location is improved.
出处
《武汉理工大学学报》
CAS
CSCD
2003年第2期91-94,共4页
Journal of Wuhan University of Technology
