声发射定位中时差计算研究  

Research of the Time Difference Computation in Acoustic Emission Location

作　　者：刘卫东[1] 张薇[1] 窦林名[2] 

机构地区：[1]中国矿业大学信电学院,江苏徐州221008 [2]中国矿业大学能源学院,江苏徐州221008

出　　处：《计算机工程与科学》2009年第4期127-129,共3页Computer Engineering & Science

基　　金：国家自然科学基金资助项目(50490273;50474068);"十一五"国家科技支撑计划资助项目(2006BAK04B02;2006BAK03B06);国家973计划资助项目(2005CB221504)

摘　　要：矿井冲压是目前在煤矿安全中较为严重的一种自然灾害,国内外学者进行了大量理论和实验研究。实践证明,应用声发射监测及地质条件综合分析是行之有效的科学方法,而声发射监测中最基本的一个问题就是声发射源的定位问题。声源的定位中最重要的就是通过声发射信号达到各个传感器的时差来计算确定其位置。声发射信号在煤岩体中的传播中产生了P波、S波等,如何来准确确定时差也就成了定位准确的首要问题。本文主要从声发射信号的时差计算出发,包括直接计数法、互相关法和小波分析的方法。通过分析对比,得出小波分析方法在时差计算上方便简单、准确性高。Rock burst is one kind of the more serious natural disasters at present in the coal mine security, and domestic and foreign scholars have carried out massive theoretical and experimental studies. Practice proves the application of acoustic emission monitoring to the synthetic analysis of the geological conditions is an effective scientific method. But in the acoustic emission monitoring the most basic is the acoustic emission source location question; in the acoustic source location the most important is determine its positon by computing the time difference of the sound transmitting messages which arrive at each sensor. The acoustic transmitting messages generate the P wave, the S wave and so on in coal rock body dissemination, and how to determine the time difference becomes the the most important accurate location question. The text mainly starts from the acoustic emission time delay computation, including the direct count method, the cross-correlation method, and the wavelet analysis method. The analytical comparison shows the wavelet analysis method is convenient, simple in calculating time differences,and the accuracy is high.

关 键 词：声发射 定位 时差 小波分析 

分 类 号：TN911.72[电子电信—通信与信息系统]