Automatic algorithm for triaxial hodogram source location in downhole acoustic emission measurement
Automatic algorithm for triaxial hodogram source location in downhole acoustic emission measurement
复制标题
井下声发射测量三轴均线图源自动定位算法
DOI：
10.1190/1.1442677
复制
发表时间：
1989
期刊：
影响因子：
3.3
通讯作者：
N. Chubachi
中科院分区：
文献类型：
--
作者：
K. Nagano;H. Niitsuma;N. Chubachi
提出了一种利用三轴霍德图法测量井下表面裂纹声发射源的自动定位算法。通过分析声发射信号能量的三个分量之间的互相关系数来检测P波的到达时间；用最小二乘法确定P波的方向。对于S波到达时间的检测，最大似然法分析了SH波分量幅度的瞬时值分布。该算法可以像人类分析一样精确地定位声发射源。对于野外测量，使用一台16位个人计算机并用C语言编写程序，S只需不到4个人就能定位一个AE源。利用该算法实现了三轴霍德图法自动定位声发射源。
An automatic acoustic emission (AE) source location algorithm has been developed for downhole AE measurement of subsurface cracks by using the triaxial hodogram method. The P-wave arrival time is detected by analyzing crosscorrelation coefficients among three components of AE signal energy; the P-wave direction is determined by the method of least squares. For detection of S-wave arrival time, a maximum‐likelihood method analyzes a distribution of instantaneous values of the SH-wave component amplitude. This algorithm can locate an AE source as accurately as human analysis. For field measurements, it takes less than 4 s to locate an AE source using a 16-bit personal computer with a program in C language. Automatic AE source location by the triaxial hodogram method has been realized with this algorithm.