声发射定位的稳健算法

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering(2009)

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Abstract
针对岩石力学实验声发射三维定位常规算法精度较低的问题,分析各种改进的定位算法.通过使用波速均匀的样品进行人工触发声发射实验发现,随机误差是岩石实验中声发射定位不准的最主要因素.为消除随机误差,采用最小绝对偏差法进行定位.绝对偏差最小法是一种适合于存在离群点时的稳健估计算法,可以克服最小二乘法仅在误差为正态分布时才有效的缺点.实验结果表明,与最小二乘法相比,当数据中存在个别误差较大的离群点时,采用最小绝对偏差法可以使得定位精度得到明显改善.
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Key words
3D location,Acoustic emission location,Robust statistics,Rock mechanics,Seismic location
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