煤岩电磁辐射混沌特性分析
首发时间:2011-02-25
摘要:电磁辐射指标综合反映了煤岩动力系统演变情况。为了讨论电磁辐射时间序列是否具有混沌特征,实现电磁辐射的预报,提前了解煤岩体未来的动力变化情况,利用在线式电磁辐射监测仪KBD7对掘进煤巷进行了跟踪监测,用小数据量方法计算了实测电磁辐射时间序列的最大lyapunov指数,结果表明其具有混沌特征,电磁辐射短期内可以预测,适当选择样本容量和排除干扰可以提高预测精度。
关键词: 煤岩动力灾害 电磁辐射 lyapunov指数 混沌 预测
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The Analysis of Chaotic Characteristic of Coal and Rock Electromagnetic Radiation Time Series
Abstract:The evolution of the coal and rock dynamic system can be reflected by the electromagnetic radiation (EMR) indexes. The chaotic characteristics of EMR time series can be judged by its largest lyapunov exponent, if it has chaotic characteristics, the predictable time can be determined by the largest lyapunov exponent of the EMR time series, and the predictive value in the predictable time can be obtained. Therefore, the EMR evolution of the coal and rock will be understood in advance. A roadway was monitored by on-line electromagnetic radiation monitor (KBD7) during the excavation. The largest lyapunov exponent of monitored EMR time series was calculated based on method of small data sets, the results showed that the EMR time series have chaotic characteristics, EMR can be predicted in short term, the precision can be improved by eliminating interference and choosing the appropriate sample size .
Keywords: dynamic disaster EMR lyapunov exponent chaos prediction
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