基于全相位相位差法的Geiger算法的源定位研究

发布时间：2018-06-22 20:18

本文选题：声发射定位 + 小波去噪　；参考：《华北理工大学》2017年硕士论文

【摘要】：声发射定位被应用在岩石破裂中,对矿岩预警研究具有重要的意义。现在常用的声发射定位方法有时差定位、互相关定位、Geiger定位。Geiger算法在地震领域中得到广泛应用,其迭代算法的劣势就是其本身对运算初始值要求特别苛刻,如果初始迭代值在开始选择时不严谨,迭代过程的计算会不容易进入收敛范围,这样造成的后果则是增加了迭代次数。针对上述问题,提出基于全相位相位差法的Geiger算法的岩石声发射定位方法,具体试验为对50 mm×100 mm×50 mm的花岗岩进行断铅实验,接着充分利用全相位FFT相位不变性的优势分析断铅信号,通过相位差法求出时延同时反演声发射源求出Geiger迭代初始值,接着综合最小二乘法与Geiger算法迭代求解,求出最优解,确定岩石破裂点坐标。仿真结果证明此方法有效解决了Geiger初始值选取的问题,使其能够更快进入了收敛范围,结果表现出良好的特性,相比美国PCI-2型声发射仪器定位结果的平均误差,其误差降低了约6mm。与此同时在同等试验条件下,分别做了其它三种声发射定位算法(基于全相位多次互相关定位、基于多次互相关的Geiger定位、基于全相位多次互相关的Geiger算法定位)用以比较,比较结果显示基于全相位相位差法的Geiger算法的定位效果最好。
[Abstract]:Acoustic emission location is applied to rock rupture, which is of great significance to the study of ore-rock warning. At present, the commonly used acoustic emission localization methods are moveout localization. The Getger algorithm of cross-correlation localization is widely used in the seismic field. The disadvantage of the iterative algorithm is that it requires very strict initial operating values. If the initial iteration value is not strictly selected at the beginning, the calculation of the iterative process will not easily enter the convergence range, which will result in an increase in the number of iterations. In order to solve the above problems, a new acoustic emission localization method based on all phase difference method based on Geiger algorithm is proposed. The experiment is carried out on 50 mm 脳 100 mm 脳 50 mm granite. Then, based on the advantage of phase invariance of all phase FFT, the lead broken signal is analyzed, and the initial value of Geiger iteration is obtained by phase difference method, and the optimal solution is obtained by synthesizing the least square method and the Geiger algorithm. Determine the coordinates of the rock rupture point. The simulation results show that this method can effectively solve the problem of selecting the initial value of Geiger and enable it to enter the convergence range more quickly. The results show good characteristics. Compared with the average error of the localization results of the PCI-2 acoustic emission instrument in the United States, the proposed method can be used to solve the problem effectively. The error is reduced by about 6 mm. At the same time, under the same experimental conditions, three other acoustic emission localization algorithms (based on all-phase multiple cross-correlation localization, Geiger location based on multiple cross-correlation and Geiger algorithm based on all-phase multiple cross-correlation) are made for comparison. The results show that Geiger algorithm based on all phase difference method has the best localization effect.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU45

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