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黄金科学技术 ›› 2022, Vol. 30 ›› Issue (2): 209-221.doi: 10.11872/j.issn.1005-2518.2022.02.162

• 采选技术与矿山管理 • 上一篇    下一篇

基于改进CEEMDAN-DCNN的声发射源识别分类方法

谢学斌(),刘涛(),张欢   

  1. 中南大学资源与安全工程学院,湖南 长沙 410083
  • 收稿日期:2021-11-03 修回日期:2021-12-28 出版日期:2022-04-30 发布日期:2022-06-17
  • 通讯作者: 刘涛 E-mail:xbxie@csu.edu.cn;849130941@qq.com
  • 作者简介:谢学斌(1968-),男,湖南祁东人,教授,从事矿山地压与岩爆灾害的预测和控制技术研究工作。xbxie@csu.edu.cn
  • 基金资助:
    广西重点研发计划项目“地下矿山大型复杂采空区群灾害性地压智能监控预警与控制技术研究”(编号:桂科AB18294004)资助

Identification and Classification Method of Underground AE Source Based on Improved CEEMDAN-DCNN

Xuebin XIE(),Tao LIU(),Huan ZHANG   

  1. School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China
  • Received:2021-11-03 Revised:2021-12-28 Online:2022-04-30 Published:2022-06-17
  • Contact: Tao LIU E-mail:xbxie@csu.edu.cn;849130941@qq.com

摘要:

声发射源的准确分类识别是声发射地压监测预报预警研究的重要基础。针对矿山井下围岩体声发射事件信号和采掘作业噪声信号分类识别问题,提出了一种基于改进完备总体经验模态分解和深度卷积神经网络(DCNN)的智能识别分类方法。首先,对信号进行改进CEEMDAN降噪处理,即利用相关性系数阈值和排列熵(PE)阈值剔除伪分量和噪声分量;然后,利用DCNN对降噪后的信号自动提取高维特征;最后,将特征用于softmax分类器分类识别,实现智能化井下信号源多分类。研究表明:改进CEEMDAN能够有效剔除伪分量及噪声分量;相比其他机器学习方法,改进CEEMDAN-DCNN方法具有准确率高和稳定性较好等优点。信号源识别分类方法研究为地压监测预警预报提供了重要的基础数据,准确的灾害预警预报可为矿山井下作业人员和设备提供安全保障。

关键词: 声发射监测, 波形分类, 信号分类识别, 改进CEEMDAN, 深度卷积神经网络(DCNN), 排列熵(PE)

Abstract:

Accurate classification and identification of acoustic emission sources is an important basis for the study of acoustic emission ground pressure monitoring, forecasting and early warning.Aiming at the clas-sification and identification of acoustic emission event signals and mining operation noise signals of surrounding rock masses in underground mines, an intelligent recognition and classification method based on improved complete ensemble empirical mode decomposition and deep convolutional neural network(DCNN)was proposed.Firstly,the signal was decomposed by CEEMDAN, the decomposed IMF components were screened, and the components greater than the permutation entropy threshold or less than the correlation coefficient threshold were removed, and the residual IMF components were reconstructed to obtain the denoised waveform.Then, the DCNN method was used to automatically extract high-dimensional features from the denoised waveform.Finally, the features were used for classification and recognition of softmax classifier to realize intelligent multi-classification of underground signal sources.The results of this research show that:(1)Aiming at the difficulty of multi-classification of waveforms received by acoustic emission monitoring equipment,a waveform classification and recognition method based on improved CEEMDAN-DCNN is proposed.Combined with the advantages of improved CEEMDAN’s advantages of adaptive analysis,pro-cessing of nonlinear and non-stationary signals and the ability of DCNN to automatically extract high-dimensional features, the intelligent multi-classification of underground signal sources is realized.(2)In order to verify the advantages of the improved CEEMDAN algorithm, the simulation signal is constructed to simulate the acoustic emission signal of surrounding rock mass containing noise signal, and the background noise component and pseudo component are eliminated by a joint threshold.The results show that the improved CEEMDAN algorithm can eliminate noise signals and some false components, and retain the essential characteristics of the signal.(3)Through the test, the accuracy of waveform classification based on the improved CEEMDAN-DCNN method in this paper reaches 97.12%. Compared with the traditional SVM, ANN, and CNN methods, the accuracy of waveform classification is higher and the stability is better. The accuracy of DCNN classification and recognition is improved dueing to the signal preprocessed by improved CEEMDAN.(4)The waveform recognition and classification method in this paper can accurately identify the acoustic emission events of surrounding rock masses and non-surrounding rock masses, provide reliable basic research data for ground pressure monitoring and early warning models, and increase the accuracy of ground pressure monitoring and safety early warning and forecasting.

Key words: acoustic emission monitoring, waveform classification, signal classification and recognition, improved CEEMDAN, deep convolutional neural network(DCNN), permutation entropy(PE)

中图分类号: 

  • TD76

图1

改进CEEMDAN-DCNN波形识别分类模型"

表1

CEEMD、CEEMDAN及改进CEEMDAN法参数及性能比较"

方法噪声个数噪声幅值ai噪声标准差迭代次数嵌入维数时间延迟计算耗时/s正交性指标
CEEMD35×20.2----23.07980.0879
CEEMDAN700.20.1200--8.53360.0318
改进CEEMDAN700.20.1200614.00673.8396e-4

图2

仿真信号时域波形"

图3

仿真信号CEEMD分解结果"

图4

仿真信号CEEMDAN分解结果"

图5

仿真信号改进CEEMDAN分解结果"

图6

声发射监测系统网络结构示意图"

图7

4类典型信号波形图"

表2

改进CEEMDAN分解参数"

方法

噪声

个数

噪声

幅值ai

噪声

标准差

迭代

次数

嵌入

维数

时间

延迟

改进CEEMDAN700.20.120061

图8

围岩体声发射波形CEEMDAN分解结果"

表3

IMF分量的PE值和相关系数"

分量排列熵值相关性系数
IMF10.910.14
IMF20.740.92
IMF30.680.7
IMF40.670.61
IMF50.580.58
IMF60.500.38
IMF70.420.30
IMF80.210.15

图9

围岩体声发射信号改进CEEMDAN分解结果"

图10

围岩体声发射事件原始波形及降噪后信号对比"

表4

DCNN模型主要结构参数"

网络层输出卷积核尺寸/步长padding激活函数
输入层1×1 024---
卷积层C11×641×3/1sameReLU
DropoutD11×64比率:0.2
卷积层C21×2561×3/1sameReLU
DropoutD21×256比率:0.2
卷积层C31×321×3/1sameReLU
DropoutD31×32比率:0.2
卷积层C41×321×3/1sameReLU
DropoutD41×32比率:0.2
卷积层C51×321×3/1sameReLU
DropoutD51×32比率:0.2
卷积层C61×321×3/1sameReLU
DropoutD61×32比率:0.2
全连接层F11×512--ReLU
dropout1×512比率:0.5
全连接层F21×4---

表5

本文方法与SVM、ANN及CNN性能对比"

评估指标本文方法DCNNSVMANNCNN
准确率/%97.12(σ=0.89%93.44(σ=1.02%84.11(σ=1.99%69.77(σ=3.22%89.23(σ=1.87%
精确率/%97.25(σ=0.71%93.35(σ=1.16%84.09(σ=1.96%68.26(σ=3.19%89.13(σ=2.03%
召回率/%98.09(σ=0.83%91.43(σ=1.19%83.52(σ=1.98%68.83(σ=3.18%90.69(σ=1.91%
计算时间/s5.67(σ=0.52%7.72(σ=0.52%20.19(σ=0.52%22.10(σ=0.52%10.65(σ=0.52%

图11

测试集分类准确率和损失率函数曲线"

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