声发射定位精度尺寸效应的试验研究

doi:10.13722/j.cnki.jrme.2015.0921

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摘要利用PCI–2型声发射试验装置，通过不同试件尺寸条件下的声发射断铅定位试验，对声发射定位精度尺寸效应进行研究。研究结果表明：当利用数据参数绝对值分析法进行处理时，对于同一平面，试件尺寸越大，该面的平均位置偏差越大，定位精度越不准；而在利用数据参数归一化处理时，相同平面试件尺寸为100 mm的试件相对误差却为最小。同时结合相对误差与较优点进行分析，得出在进行岩石声发射定位试验时，采用100 mm试件定位效果更好。在进行断铅定位时，断铅点位置不同对声发射定位精度也会产生较大影响，即断铅点距试件边界越近，位置偏差越大，其定位精度就越差，并且将各点坐标投射至三维方向，发现各定位点位于垂直于其所在平面方向坐标矢量大小不定，方向均指向靠近指向试件内部，而平行方向矢量值大小不定，方向不定，比较两方向得出，垂直方向矢量值均大于平行方向矢量值。

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	许江1
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关键词 ：岩石力学, 声发射, 定位精度, 尺寸效应, 声发射定位

Abstract：Using PCI–2 type acoustic emission(AE) testing system to experiment the pencil lead break test under different sizes specimens in order to study on the size effect of acoustic emission location accuracy. The results suggested that：When using absolute value analysis method for analyzing processing data，as for the same plane， the bigger size，the greater average position deviation but the less location accuracy. When using the data normalization analysis method，as for the same plane，the relative error of 100 mm specimens is minimal. At the same time，combining with the relative error and the better points analysis results，it showed that it is better to use 100 mm specimen when someone need to carry out the rock acoustic emission location experiment. While it also showed that different point location also can make great influences on emission location accuracy. The closer distance to the boundary，the greater average position deviation is. After projected the coordinates of each point into three-dimension and analyzed，it can be seen that the value of perpendicular direction vector is variable， but the direction is fixed which means all of them point to the specimen internal. As for the parallel vectors，the value and the directions are variable. When compared the value of perpendicular direction vectors with parallel vectors，perpendicular direction vectors must be larger than parallel vectors.

Key words： rock mechanids acoustic emission location accuracy size effect acoustic emission location

引用本文:

许江1，2，李伊1，2，田傲雪1，2，瞿佳美1，2. 声发射定位精度尺寸效应的试验研究[J]. 岩石力学与工程学报, 2016, 35(S1): 2826-2835.
XU Jiang1，2，LI Yi1，2，TIAN Aoxue1，2，QU Jiamei1，2. Experimental research on size effect of acoustic emission location accuracy. , 2016, 35(S1): 2826-2835.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.0921 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS1/2826

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