基于全相位相位差法的Geiger算法的源定位研究
本文選題:聲發(fā)射定位 + 小波去噪; 參考:《華北理工大學(xué)》2017年碩士論文
【摘要】:聲發(fā)射定位被應(yīng)用在巖石破裂中,對(duì)礦巖預(yù)警研究具有重要的意義,F(xiàn)在常用的聲發(fā)射定位方法有時(shí)差定位、互相關(guān)定位、Geiger定位。Geiger算法在地震領(lǐng)域中得到廣泛應(yīng)用,其迭代算法的劣勢(shì)就是其本身對(duì)運(yùn)算初始值要求特別苛刻,如果初始迭代值在開(kāi)始選擇時(shí)不嚴(yán)謹(jǐn),迭代過(guò)程的計(jì)算會(huì)不容易進(jìn)入收斂范圍,這樣造成的后果則是增加了迭代次數(shù)。針對(duì)上述問(wèn)題,提出基于全相位相位差法的Geiger算法的巖石聲發(fā)射定位方法,具體試驗(yàn)為對(duì)50 mm×100 mm×50 mm的花崗巖進(jìn)行斷鉛實(shí)驗(yàn),接著充分利用全相位FFT相位不變性的優(yōu)勢(shì)分析斷鉛信號(hào),通過(guò)相位差法求出時(shí)延同時(shí)反演聲發(fā)射源求出Geiger迭代初始值,接著綜合最小二乘法與Geiger算法迭代求解,求出最優(yōu)解,確定巖石破裂點(diǎn)坐標(biāo)。仿真結(jié)果證明此方法有效解決了Geiger初始值選取的問(wèn)題,使其能夠更快進(jìn)入了收斂范圍,結(jié)果表現(xiàn)出良好的特性,相比美國(guó)PCI-2型聲發(fā)射儀器定位結(jié)果的平均誤差,其誤差降低了約6mm。與此同時(shí)在同等試驗(yàn)條件下,分別做了其它三種聲發(fā)射定位算法(基于全相位多次互相關(guān)定位、基于多次互相關(guān)的Geiger定位、基于全相位多次互相關(guān)的Geiger算法定位)用以比較,比較結(jié)果顯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.
【學(xué)位授予單位】:華北理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TU45
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