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A fault diagnosis method based on improved dung beetle optimizer (IDBO)-time varying filtered empirical mode decomposition (TVFEMD) with improved wavelet threshold functions was proposed aiming at that the vibration signal of rolling bearing fault tends to be disturbed and overwhelmed by strong noise background. IDBO was primarily developed to iteratively optimize B-spline order and bandwidth threshold ξ in TVFEMD,and the optimal parameter combination was obtained. Applying TVFEMD on the original signal, the decomposition for intrinsic mode function (IMF) component series were achieved, among which the irrelevant components were removed by correlation coefficient criterion, and target signals were reconstructed. Then the improved wavelet threshold function was employed on the new signal for further denoising.Finally, the envelope spectrum of the processed signal was calculated, from which the typical fault characteristic frequency was extracted. Through simulation signal and fault simulation test analysis, the fault diagnosis method combined with IDBO-TVFEMD and improved wavelet threshold function was compared with empirical mode decomposition (EMD), ensemble empirical mode decomposition (EEMD) and complete EEMD with adaptive noise (CEEMDAN) denoising methods. The research results show that the algorithm model proposed in this paper has higher efficiency.
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针对滚动轴承故障的振动信号在强噪声背景下容易受到干扰不易提取的情况,提出了一种基于改进的蜣螂优化器(Improved Dung Beetle Optimizer, IDBO)算法-时变滤波经验模态分解(Time Varying Filtered Empirical Mode Decompo-sition, TVFEMD)与新型小波阈值函数去噪相结合的故障诊断方法。首先,运用IDBO对TVFEMD中B样条阶数和带宽阈值ξ进行迭代寻优,得出最佳参数组合,然后,对原始信号进行TVFEMD,得到各本征模态函数(Intrinsic Mode Function, IMF)分量,通过相关系数准则去除其中的无关分量,重构新信号。随后,运用改进的小波阈值函数对新信号进行二次去噪处理。最后,对处理完的信号进行包络谱分析,提取其故障特征频率。通过仿真模拟信号与故障模拟试验分析研究,实现IDBO-TVFEMD与改进小波阈值函数相结合的故障诊断方法和经验模态分解(Empirical Mode Decomposition, EMD)、集合经验模态分解(Ensemble Empirical Mode Decomposition, EEMD)、完全集合经验模态分解去噪(Complete EEMD with Adaptive Noise, CEEMDAN)方法的对比,研究结果表明,提出的算法模型具备更好的诊断效果。
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别锋锋,男,1979年生,湖北仙桃人,博士,副教授,硕士研究生导师;主要研究方向为能源装备结构完整性、机械智能故障诊断等;E-mail:bieff@cczu.edu.cn。
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别锋锋,男,1979年生,湖北仙桃人,博士,副教授,硕士研究生导师;主要研究方向为能源装备结构完整性、机械智能故障诊断等;E-mail:bieff@cczu.edu.cn。
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别锋锋,男,1979年生,湖北仙桃人,博士,副教授,硕士研究生导师;主要研究方向为能源装备结构完整性、机械智能故障诊断等;E-mail:bieff@cczu.edu.cn。
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1.School of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou 213164, China
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Flow chart of TVFEMD algorithm, figureFileSmall=qSmmoae/tXA8WN8NZX36Wg==, figureFileBig=E903GzklgtWB063VeNQ1rQ==, tableContent=null), ArticleFig(id=1228282213834354931, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图1, caption=
时变滤波经验模态分解算法流程图, figureFileSmall=qSmmoae/tXA8WN8NZX36Wg==, figureFileBig=E903GzklgtWB063VeNQ1rQ==, tableContent=null), ArticleFig(id=1228282214044070139, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.2, caption=
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阈值函数特性对比, figureFileSmall=mLZf6jKE2rAT8m5xzpSyoA==, figureFileBig=hhYYskZW5bIG88jlFcVKRg==, tableContent=null), ArticleFig(id=1228282214291534078, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.3, caption=
Fault diagnosis process, figureFileSmall=2aV/W4LXVAlMG1B/2g2XZQ==, figureFileBig=e6O7W/pZoNSNrzs3NNFb/g==, tableContent=null), ArticleFig(id=1228282214375420159, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图3, caption=
故障诊断流程, figureFileSmall=2aV/W4LXVAlMG1B/2g2XZQ==, figureFileBig=e6O7W/pZoNSNrzs3NNFb/g==, tableContent=null), ArticleFig(id=1228282214622884098, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.4, caption=
Time-domain diagram of the simulated signal, figureFileSmall=Em3NC3wEZRqMyDRQ8FLLlw==, figureFileBig=ItzG+Q0Ue5VsXc53xhJltw==, tableContent=null), ArticleFig(id=1228282214719353092, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图4, caption=
仿真信号时域图, figureFileSmall=Em3NC3wEZRqMyDRQ8FLLlw==, figureFileBig=ItzG+Q0Ue5VsXc53xhJltw==, tableContent=null), ArticleFig(id=1228282214807433479, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.5, caption=
Convergence curves of different function iterations, figureFileSmall=V4TACyzfuSVvBBFh1KTxKA==, figureFileBig=dRRxA6ORrQ8bKJDqOyQUww==, tableContent=null), ArticleFig(id=1228282214882930955, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图5, caption=
不同函数迭代收敛曲线, figureFileSmall=V4TACyzfuSVvBBFh1KTxKA==, figureFileBig=dRRxA6ORrQ8bKJDqOyQUww==, tableContent=null), ArticleFig(id=1228282214983594257, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.6, caption=
Iterative convergence curve, figureFileSmall=UvEfBzkNfci81F2aB2EcEw==, figureFileBig=RXZnq/f9cqqaWiU/pMUFsA==, tableContent=null), ArticleFig(id=1228282215088451859, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图6, caption=
迭代收敛曲线, figureFileSmall=UvEfBzkNfci81F2aB2EcEw==, figureFileBig=RXZnq/f9cqqaWiU/pMUFsA==, tableContent=null), ArticleFig(id=1228282215189115158, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.7, caption=
TVFEMD (simulation), figureFileSmall=eu5t833K23C0qlGjLyar/Q==, figureFileBig=F+DYwelp0fRJoAvDUMfJWA==, tableContent=null), ArticleFig(id=1228282215293972762, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图7, caption=
时变滤波经验模态分解(仿真), figureFileSmall=eu5t833K23C0qlGjLyar/Q==, figureFileBig=F+DYwelp0fRJoAvDUMfJWA==, tableContent=null), ArticleFig(id=1228282215377858846, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.8, caption=
Denoising time-domain diagram of the TVFEMD-improved wavelet threshold function, figureFileSmall=OprjFh+ntEn8zxzet6hVqQ==, figureFileBig=L+gIh9EgmWi7M8kMnJLoeg==, tableContent=null), ArticleFig(id=1228282215478522141, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图8, caption=
TVFEMD-改进的小波阈值函数去噪时域图, figureFileSmall=OprjFh+ntEn8zxzet6hVqQ==, figureFileBig=L+gIh9EgmWi7M8kMnJLoeg==, tableContent=null), ArticleFig(id=1228282215566602528, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.9, caption=
Test platform of the bearing system, figureFileSmall=ozndwJv6euQP/5J+Kb+3+Q==, figureFileBig=gaY5E5851IcjPMSp/+X0Mw==, tableContent=null), ArticleFig(id=1228282215650488611, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图9, caption=
轴承系统试验平台, figureFileSmall=ozndwJv6euQP/5J+Kb+3+Q==, figureFileBig=gaY5E5851IcjPMSp/+X0Mw==, tableContent=null), ArticleFig(id=1228282215763734823, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.10, caption=
Compound fault of inner and outer rings of bearings, figureFileSmall=G+7U9ue3SwYHWvI9Fn6zdQ==, figureFileBig=iE2vGMS3Omjbhe1TCDCdzg==, tableContent=null), ArticleFig(id=1228282215851815208, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图10, caption=
轴承内外圈复合故障, figureFileSmall=G+7U9ue3SwYHWvI9Fn6zdQ==, figureFileBig=iE2vGMS3Omjbhe1TCDCdzg==, tableContent=null), ArticleFig(id=1228282215939895595, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.11, caption=
Time-domain diagram of the bearings' vibration signal, figureFileSmall=QaFOxL/zp1ccpsgzj5PU4Q==, figureFileBig=Aa+7/yysDSQNHJ6pD5pM4A==, tableContent=null), ArticleFig(id=1228282216027975982, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图11, caption=
轴承振动信号时域图, figureFileSmall=QaFOxL/zp1ccpsgzj5PU4Q==, figureFileBig=Aa+7/yysDSQNHJ6pD5pM4A==, tableContent=null), ArticleFig(id=1228282216166388018, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.12, caption=
Envelope spectrum after adding the -10 dB white noise, figureFileSmall=AEgVDEAeUKSfHGo7xYY80g==, figureFileBig=BHpd5UtGHUv5Mx0C8njbCw==, tableContent=null), ArticleFig(id=1228282216262857013, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图12, caption=
加-10 dB白噪声后的包络谱, figureFileSmall=AEgVDEAeUKSfHGo7xYY80g==, figureFileBig=BHpd5UtGHUv5Mx0C8njbCw==, tableContent=null), ArticleFig(id=1228282217630200121, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.13, caption=
Iterative curve, figureFileSmall=+xvC0jiiYRkqZw3bQpDCBw==, figureFileBig=lwFru1HL1q07H5qwh9DJUQ==, tableContent=null), ArticleFig(id=1228282217722474813, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图13, caption=
迭代曲线, figureFileSmall=+xvC0jiiYRkqZw3bQpDCBw==, figureFileBig=lwFru1HL1q07H5qwh9DJUQ==, tableContent=null), ArticleFig(id=1228282217831526722, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.14, caption=
TVFEMD (test), figureFileSmall=4npO82IS9yuTZN5d8wlOZg==, figureFileBig=6nUQ2vZU83opo4SmY65Law==, tableContent=null), ArticleFig(id=1228282217982521669, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图14, caption=
时变滤波经验模态分解(试验), figureFileSmall=4npO82IS9yuTZN5d8wlOZg==, figureFileBig=6nUQ2vZU83opo4SmY65Law==, tableContent=null), ArticleFig(id=1228282218108350794, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.15, caption=
Time-domain diagram after secondary denoising, figureFileSmall=8vpgt4yPFhddf5uGlgc+/Q==, figureFileBig=3gDm+/XIi4KU9orgMOgf0A==, tableContent=null), ArticleFig(id=1228282218196431180, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图15, caption=
二次去噪后时域图, figureFileSmall=8vpgt4yPFhddf5uGlgc+/Q==, figureFileBig=3gDm+/XIi4KU9orgMOgf0A==, tableContent=null), ArticleFig(id=1228282218318066000, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Fig.16, caption=
Envelope spectrum, figureFileSmall=Tnq+KdhIojXl7odZlJebCg==, figureFileBig=m+9qTd0cmAECCwKMCEDi4A==, tableContent=null), ArticleFig(id=1228282218422923605, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=图16, caption=
包络谱, figureFileSmall=Tnq+KdhIojXl7odZlJebCg==, figureFileBig=m+9qTd0cmAECCwKMCEDi4A==, tableContent=null), ArticleFig(id=1228282218506809689, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Tab.1, caption=
Optimal results of different optimization algorithms
, figureFileSmall=null, figureFileBig=null, tableContent=
| 函数Function | 指标Index | WOA | DBO | SABO | GWO | IDBO |
|---|
| f1 | 最优值Optimal value | 1.039×10-96 | 3.959×10-163 | 2.140×10-204 | 5.352×10-35 | 0.000 |
| 平均值Mean value | 1.628×10-84 | 6.531×10-123 | 1.121×10-200 | 3.716×10-33 | 0.000 |
| 标准差Standard deviation | 6.717×10-84 | 3.531×10-122 | 0.000 | 6.570×10-33 | 0.000 |
| 迭代次数Number of iterations | 500 | 500 | 500 | 500 | 287 |
| f2 | 最优值Optimal value | 8 364.008 | 3.614×10-161 | 2.191×10-80 | 2.897×10-11 | 0.000 |
| 平均值Mean value | 27 961.880 | 9.039×10-18 | 6.705×10-24 | 5.751×10-8 | 0.000 |
| 标准差Standard deviation | 12 083.978 | 4.951×10-17 | 3.672×10-23 | 1.768×10-7 | 0.000 |
| 迭代次数Number of iterations | 500 | 500 | 500 | 500 | 346 |
| f3 | 最优值Optimal value | -1.257×10-4 | -1.196×10-4 | -3.835×10-3 | -7.710×10-3 | -1.257×10-4 |
| 平均值Mean value | -1.152×10-4 | -8.772×10-3 | -3.114×10-3 | -6.131×10-3 | -1.257×10-4 |
| 标准差Standard deviation | 1 545.381 | 1 145.932 | 307.930 | 970.542 | 204.379 |
| 迭代次数Number of iterations | 444 | 313 | 157 | 500 | 235 |
| f4 | 最优值Optimal value | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| 平均值Mean value | 0.011 | 0.000 | 0.000 | 0.003 | 0.000 |
| 标准差Standard deviation | 0.034 | 0.000 | 0.000 | 0.008 | 0.000 |
| 迭代次数Number of iterations | 195 | 104 | 52 | 489 | 31 |
), ArticleFig(id=1228282218624250203, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=表1, caption=
不同优化算法寻优结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 函数Function | 指标Index | WOA | DBO | SABO | GWO | IDBO |
|---|
| f1 | 最优值Optimal value | 1.039×10-96 | 3.959×10-163 | 2.140×10-204 | 5.352×10-35 | 0.000 |
| 平均值Mean value | 1.628×10-84 | 6.531×10-123 | 1.121×10-200 | 3.716×10-33 | 0.000 |
| 标准差Standard deviation | 6.717×10-84 | 3.531×10-122 | 0.000 | 6.570×10-33 | 0.000 |
| 迭代次数Number of iterations | 500 | 500 | 500 | 500 | 287 |
| f2 | 最优值Optimal value | 8 364.008 | 3.614×10-161 | 2.191×10-80 | 2.897×10-11 | 0.000 |
| 平均值Mean value | 27 961.880 | 9.039×10-18 | 6.705×10-24 | 5.751×10-8 | 0.000 |
| 标准差Standard deviation | 12 083.978 | 4.951×10-17 | 3.672×10-23 | 1.768×10-7 | 0.000 |
| 迭代次数Number of iterations | 500 | 500 | 500 | 500 | 346 |
| f3 | 最优值Optimal value | -1.257×10-4 | -1.196×10-4 | -3.835×10-3 | -7.710×10-3 | -1.257×10-4 |
| 平均值Mean value | -1.152×10-4 | -8.772×10-3 | -3.114×10-3 | -6.131×10-3 | -1.257×10-4 |
| 标准差Standard deviation | 1 545.381 | 1 145.932 | 307.930 | 970.542 | 204.379 |
| 迭代次数Number of iterations | 444 | 313 | 157 | 500 | 235 |
| f4 | 最优值Optimal value | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| 平均值Mean value | 0.011 | 0.000 | 0.000 | 0.003 | 0.000 |
| 标准差Standard deviation | 0.034 | 0.000 | 0.000 | 0.008 | 0.000 |
| 迭代次数Number of iterations | 195 | 104 | 52 | 489 | 31 |
), ArticleFig(id=1228282218716524896, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Tab.2, caption=
Correlation coefficient of each component (simulation)
, figureFileSmall=null, figureFileBig=null, tableContent=
分量 Component | 相关系数 Correlation coefficient | 分量 Component | 相关系数 Correlation coefficient |
|---|
| IMF1 | 0.183 0 | IMF4 | 0.059 5 |
| IMF2 | 0.134 5 | IMF5 | 0.306 9 |
| IMF3 | 0.167 8 | IMF6 | 0.905 5 |
), ArticleFig(id=1228282218800410978, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=表2, caption=
各分量相关系数(仿真)
, figureFileSmall=null, figureFileBig=null, tableContent=
分量 Component | 相关系数 Correlation coefficient | 分量 Component | 相关系数 Correlation coefficient |
|---|
| IMF1 | 0.183 0 | IMF4 | 0.059 5 |
| IMF2 | 0.134 5 | IMF5 | 0.306 9 |
| IMF3 | 0.167 8 | IMF6 | 0.905 5 |
), ArticleFig(id=1228282218934628710, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Tab.3, caption=
Denoising effect indicators of different threshold functions
, figureFileSmall=null, figureFileBig=null, tableContent=
降噪方法 Noise reduction method | 加噪5 dB Add 5 dB noise | 加噪10 dB Add 10 dB noise |
|---|
| RSNR | EMSE | RSNR | EMSE |
|---|
| TVFEMD | 10.114 2 | 0.470 8 | 9.132 9 | 0.582 3 |
TVFEMD-软阈值函数 TVFEMD-soft threshold function | 14.342 0 | 0.193 4 | 16.695 4 | 0.111 8 |
TVFEMD-硬阈值函数 TVFEMD-hard threshold function | 14.266 7 | 0.197 8 | 17.918 8 | 0.085 3 |
TVFEMD-改进的小波阈值函数 TVFEMD-improved wavelet threshold function | 15.360 0 | 0.154 7 | 20.394 1 | 0.048 5 |
), ArticleFig(id=1228282219056263528, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=表3, caption=
不同阈值函数去噪效果指标
, figureFileSmall=null, figureFileBig=null, tableContent=
降噪方法 Noise reduction method | 加噪5 dB Add 5 dB noise | 加噪10 dB Add 10 dB noise |
|---|
| RSNR | EMSE | RSNR | EMSE |
|---|
| TVFEMD | 10.114 2 | 0.470 8 | 9.132 9 | 0.582 3 |
TVFEMD-软阈值函数 TVFEMD-soft threshold function | 14.342 0 | 0.193 4 | 16.695 4 | 0.111 8 |
TVFEMD-硬阈值函数 TVFEMD-hard threshold function | 14.266 7 | 0.197 8 | 17.918 8 | 0.085 3 |
TVFEMD-改进的小波阈值函数 TVFEMD-improved wavelet threshold function | 15.360 0 | 0.154 7 | 20.394 1 | 0.048 5 |
), ArticleFig(id=1228282219140149609, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Tab.4, caption=
Specific parameters of bearings
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数Parameter | 值Value |
|---|
| 转速Speed/(r/min) | 1 200 |
| 滚珠个数Number of balls Z | 8 |
| 轴承节径Bearing pitch diameter D'/mm | 7.937 5 |
| 滚动体直径Rolling diameter d/mm | 7.938 |
| 接触角Contact angle α'/(°) | 9 |
), ArticleFig(id=1228282219215647085, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=表4, caption=
轴承具体参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数Parameter | 值Value |
|---|
| 转速Speed/(r/min) | 1 200 |
| 滚珠个数Number of balls Z | 8 |
| 轴承节径Bearing pitch diameter D'/mm | 7.937 5 |
| 滚动体直径Rolling diameter d/mm | 7.938 |
| 接触角Contact angle α'/(°) | 9 |
), ArticleFig(id=1228282219282755950, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Tab.5, caption=
Correlation coefficient of each component (test)
, figureFileSmall=null, figureFileBig=null, tableContent=
分量 Component | 相关系数 Correlation coefficient | 分量 Component | 相关系数 Correlation coefficient |
|---|
| IMF1 | 0.680 8 | IMF4 | 0.254 7 |
| IMF2 | 0.562 1 | IMF5 | 0.149 8 |
| IMF3 | 0.341 1 | IMF6 | 0.130 8 |
), ArticleFig(id=1228282219391807858, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=表5, caption=
各分量相关系数(试验)
, figureFileSmall=null, figureFileBig=null, tableContent=
分量 Component | 相关系数 Correlation coefficient | 分量 Component | 相关系数 Correlation coefficient |
|---|
| IMF1 | 0.680 8 | IMF4 | 0.254 7 |
| IMF2 | 0.562 1 | IMF5 | 0.149 8 |
| IMF3 | 0.341 1 | IMF6 | 0.130 8 |
), ArticleFig(id=1228282219496665459, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=EN, label=Tab.6, caption=
Different denoising algorithm models
, figureFileSmall=null, figureFileBig=null, tableContent=
| 类别Category | 去噪算法模型Denoising algorithm model |
|---|
| A | TVFEMD-改进的小波阈值函数 TVFEMD-improved wavelet threshold function |
| B | TVFEMD |
| C | EMD-改进的小波阈值函数 EMD-improved wavelet threshold function |
| D | EEMD-改进的小波阈值函数 EEMD-improved wavelet threshold function |
| E | CEEMDAN-改进的小波阈值函数 CEEMDAN-improved wavelet threshold function |
), ArticleFig(id=1228282219630883189, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1228282194469253689, language=CN, label=表6, caption=
不同去噪算法模型
, figureFileSmall=null, figureFileBig=null, tableContent=
| 类别Category | 去噪算法模型Denoising algorithm model |
|---|
| A | TVFEMD-改进的小波阈值函数 TVFEMD-improved wavelet threshold function |
| B | TVFEMD |
| C | EMD-改进的小波阈值函数 EMD-improved wavelet threshold function |
| D | EEMD-改进的小波阈值函数 EEMD-improved wavelet threshold function |
| E | CEEMDAN-改进的小波阈值函数 CEEMDAN-improved wavelet threshold function |
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