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Aiming at the problem of redundancy in the phase space reconstruction of sample entropy algorithm, the phase space reconstruction process of sample entropy algorithm was replaced by a symbolic variable matrix, and an improved sample entropy algorithm was established. The analysis of white noise and powder noise simulation signals shows that the improved sample entropy algorithm can extract signal features effectively and has high computational efficiency. In the past, bearing clearance faults of complex compressors were studied, and the improved sample entropy algorithm was applied to extract features and compared with sample entropy. The feature extraction results of the method are highly consistent with the sample entropy algorithm, and the computational efficiency of the algorithm is much higher than that of the sample entropy algorithm.
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针对样本熵算法在相空间重构过程中存在冗余运算的问题,通过构建符号变量矩阵的方法,对样本熵算法的相空间重构过程进行替换,建立改进的样本熵算法。白噪声和粉噪声仿真信号分析表明,改进的样本熵算法能有效提取信号的特征,并且具有较高计算效率。以往复压缩机轴承间隙故障为研究对象,应用改进的样本熵算法对其进行特征提取,并与样本熵进行对比,该方法特征提取结果与样本熵算法保持高度一致,算法的计算效率远高于样本熵算法。
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1 College of Civil Engineering and Water Conservancy Institute, Heilongjiang Bayi Agricultural University, Daqing 163319, China
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1 黑龙江八一农垦大学土木水利学院, 大庆 163319
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李彦阳(1980—),女,汉族,黑龙江讷河人,博士研究生,讲师。研究方向:往复机械设备故障机理与诊断。E-mail:liyanyang@byau.edu.cn。
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李彦阳(1980—),女,汉族,黑龙江讷河人,博士研究生,讲师。研究方向:往复机械设备故障机理与诊断。E-mail:liyanyang@byau.edu.cn。
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3 College of Intelligent Manufacturing, Hunan Railway Professional Technology College, Zhuzhou 412001, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1225467183682207924, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, authorId=1225467183376023712, language=CN, stringName=罗伟, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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2019(4): 120-123, 132., articleTitle=A fault diagnosis method for reciprocating compressor bearings based on parameter optimization VMD and MDE, refAbstract=null)], funds=[Fund(id=1225467196541944764, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, awardId=KYTD202103, language=CN, fundingSource=湖南铁道职业技术学院机电一体化科研创新团队建设资助(KYTD202103), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1225467180834275330, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, xref=1, ext=[AuthorCompanyExt(id=1225467180876218372, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, companyId=1225467180834275330, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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3 湖南铁道职业技术学院智能制造学院, 株洲 412001)])], figs=[ArticleFig(id=1225467187834569161, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=EN, label=Fig.1, caption=
The sample entropy algorithm illustrates the flow chart, figureFileSmall=nWD2unT8jyUwQQzqj4RHVg==, figureFileBig=Lwzn8LWhIhSxkiLHQDIIWA==, tableContent=null), ArticleFig(id=1225467188014924253, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=CN, label=图1, caption=
样本熵算法示意流程图, figureFileSmall=nWD2unT8jyUwQQzqj4RHVg==, figureFileBig=Lwzn8LWhIhSxkiLHQDIIWA==, tableContent=null), ArticleFig(id=1225467188191085040, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=EN, label=Fig.2, caption=
Sequence reconstruction steps under different dimensions of sample entropy algorithm, figureFileSmall=MUs+JTklA9z0z/tBd8/zKg==, figureFileBig=sPmFhsopnYXlJibhOiLnQQ==, tableContent=null), ArticleFig(id=1225467188413383168, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=CN, label=图2, caption=
样本熵算法不同维度下的序列重构步骤, figureFileSmall=MUs+JTklA9z0z/tBd8/zKg==, figureFileBig=sPmFhsopnYXlJibhOiLnQQ==, tableContent=null), ArticleFig(id=1225467188656652826, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=EN, label=Fig.3, caption=
The calculation method of distance between vectors in different dimensions by sample entropy algorithm, figureFileSmall=zzm1GJsVSXGs3IJBAswxDg==, figureFileBig=rJQWZOcFyv7H5uJ7/uov9w==, tableContent=null), ArticleFig(id=1225467188845396528, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=CN, label=图3, caption=
样本熵算法不同维度下各向量间的距离计算方式, figureFileSmall=zzm1GJsVSXGs3IJBAswxDg==, figureFileBig=rJQWZOcFyv7H5uJ7/uov9w==, tableContent=null), ArticleFig(id=1225467189004780092, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=EN, label=Fig.4, caption=
Entropy curves of two different simulation signals, figureFileSmall=M2pCwi9on5DMaqrzFaLV7g==, figureFileBig=7qFLJytNiIN4SejhSwwx9A==, tableContent=null), ArticleFig(id=1225467189197718099, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=CN, label=图4, caption=
两种不同仿真信号的熵值曲线图, figureFileSmall=M2pCwi9on5DMaqrzFaLV7g==, figureFileBig=7qFLJytNiIN4SejhSwwx9A==, tableContent=null), ArticleFig(id=1225467189591982702, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=EN, label=Fig.5, caption=
Two different bearing state diagram, figureFileSmall=7Sh0UphsMfIKm98OguE7pw==, figureFileBig=2/B3lxvlZ0Ppe8op+1TiMw==, tableContent=null), ArticleFig(id=1225467189684257403, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=CN, label=图5, caption=
两种不同轴瓦状态图, figureFileSmall=7Sh0UphsMfIKm98OguE7pw==, figureFileBig=2/B3lxvlZ0Ppe8op+1TiMw==, tableContent=null), ArticleFig(id=1225467189797503623, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=EN, label=Fig.6, caption=
Time domain waveform of the bearing under normal condition, figureFileSmall=sFPZrOsfLX2vn8+H5MpF1A==, figureFileBig=LIOG6tFSMNKgnmzPSjPS7w==, tableContent=null), ArticleFig(id=1225467189906555536, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=CN, label=图6, caption=
轴瓦正常状态下的时域波形图, figureFileSmall=sFPZrOsfLX2vn8+H5MpF1A==, figureFileBig=LIOG6tFSMNKgnmzPSjPS7w==, tableContent=null), ArticleFig(id=1225467190036578977, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=EN, label=Fig.7, caption=
Time domain waveform diagram of bearing bush under wear condition, figureFileSmall=0iOXRB3EPlQiYyKvCdi4QQ==, figureFileBig=zc0xcMMzJG/Wtg5D3bS3Yw==, tableContent=null), ArticleFig(id=1225467191471030964, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=CN, label=图7, caption=
轴瓦磨损状态下的时域波形图, figureFileSmall=0iOXRB3EPlQiYyKvCdi4QQ==, figureFileBig=zc0xcMMzJG/Wtg5D3bS3Yw==, tableContent=null), ArticleFig(id=1225467191613637316, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=EN, label=Fig.8, caption=
The entropy curve of bearing vibration signal calculated by two different entropy algorithms, figureFileSmall=E6kQWFqCJ35kdcaUCGlC/w==, figureFileBig=poTJJbkGOLFq9Z8gj051SQ==, tableContent=null), ArticleFig(id=1225467191840129745, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=CN, label=图8, caption=
两种不同熵值算法计算下的轴承振动信号熵值曲线, figureFileSmall=E6kQWFqCJ35kdcaUCGlC/w==, figureFileBig=poTJJbkGOLFq9Z8gj051SQ==, tableContent=null), ArticleFig(id=1225467192087593692, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=EN, label=Fig.9, caption=
The two entropy algorithms correspond to the change of entropy of vibration signal of bearing wear state under different sampling time, figureFileSmall=vsD4jjwWQEwpORRh0Izkqw==, figureFileBig=zjw8XnM0rFfTyTlFbg5f/Q==, tableContent=null), ArticleFig(id=1225467192481858296, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=CN, label=图9, caption=
两种熵值算法对应不同采样时间下轴瓦磨损状态振动信号的熵值变化情况, figureFileSmall=vsD4jjwWQEwpORRh0Izkqw==, figureFileBig=zjw8XnM0rFfTyTlFbg5f/Q==, tableContent=null), ArticleFig(id=1225467193308136223, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=EN, label=Table 1, caption=
The two entropy algorithms correspond to the calculation time of feature extraction for white noise of different lengths
, figureFileSmall=null, figureFileBig=null, tableContent=
样本 长度 | SE (S1)/s | ISE (S2)/s | S1/S2 | S2较S1速度 提升的百分比/% |
| 2 048 | 0.27 | 0.14 | 1.93 | 92.86 |
| 4 096 | 1.28 | 0.57 | 2.25 | 124.56 |
| 8 192 | 8.79 | 1.89 | 4.65 | 365.08 |
| 16 384 | 69.66 | 7.15 | 9.74 | 874.27 |
), ArticleFig(id=1225467193610126134, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=CN, label=表1, caption=
两种熵值算法对应不同长度白噪声的特征提取计算时间
, figureFileSmall=null, figureFileBig=null, tableContent=
样本 长度 | SE (S1)/s | ISE (S2)/s | S1/S2 | S2较S1速度 提升的百分比/% |
| 2 048 | 0.27 | 0.14 | 1.93 | 92.86 |
| 4 096 | 1.28 | 0.57 | 2.25 | 124.56 |
| 8 192 | 8.79 | 1.89 | 4.65 | 365.08 |
| 16 384 | 69.66 | 7.15 | 9.74 | 874.27 |
), ArticleFig(id=1225467193807258436, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=EN, label=Table 2, caption=
The two entropy algorithms correspond to the calculation time of feature extraction for powder noise of different length
, figureFileSmall=null, figureFileBig=null, tableContent=
样本 长度 | SE (S1)/s | ISE (S2)/s | S1/S2 | S2较S1速度 提升的百分比/% |
| 2 048 | 0.35 | 0.18 | 1.94 | 94.44 |
| 4 096 | 1.48 | 0.63 | 2.35 | 134.92 |
| 8 192 | 11.91 | 2.31 | 5.16 | 415.58 |
| 16 384 | 79.82 | 8.95 | 8.92 | 791.84 |
), ArticleFig(id=1225467194042139475, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=CN, label=表2, caption=
两种熵值算法对应不同长度粉噪声的特征提取计算时间
, figureFileSmall=null, figureFileBig=null, tableContent=
样本 长度 | SE (S1)/s | ISE (S2)/s | S1/S2 | S2较S1速度 提升的百分比/% |
| 2 048 | 0.35 | 0.18 | 1.94 | 94.44 |
| 4 096 | 1.48 | 0.63 | 2.35 | 134.92 |
| 8 192 | 11.91 | 2.31 | 5.16 | 415.58 |
| 16 384 | 79.82 | 8.95 | 8.92 | 791.84 |
), ArticleFig(id=1225467194214105949, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=EN, label=Table 3, caption=
The two entropy algorithms under a single scale correspond to the entropy calculation time of bearing vibration signals under different length bearing bush wear states
, figureFileSmall=null, figureFileBig=null, tableContent=
样本 长度 | SE (S1)/s | ISE (S2)/s | S1/S2 | S2较S1速度 提升的百分比/% |
| 6 014 | 4.96 | 2.12 | 2.01 | 133.96 |
| 12 028 | 24.52 | 4.91 | 4.93 | 399.39 |
| 18 042 | 75.31 | 9.89 | 7.85 | 661.48 |
| 24 056 | 143.91 | 15.78 | 9.12 | 816.62 |
), ArticleFig(id=1225467194503512938, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=CN, label=表3, caption=
单一尺度下两种熵值算法对应不同长度轴瓦磨损状态下轴承振动信号的熵值计算时间
, figureFileSmall=null, figureFileBig=null, tableContent=
样本 长度 | SE (S1)/s | ISE (S2)/s | S1/S2 | S2较S1速度 提升的百分比/% |
| 6 014 | 4.96 | 2.12 | 2.01 | 133.96 |
| 12 028 | 24.52 | 4.91 | 4.93 | 399.39 |
| 18 042 | 75.31 | 9.89 | 7.85 | 661.48 |
| 24 056 | 143.91 | 15.78 | 9.12 | 816.62 |
), ArticleFig(id=1225467195971519362, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=EN, label=Table 4, caption=
The two entropy algorithms correspond to the entropy calculation time of bearing vibration signal under different length bearing wear conditions
, figureFileSmall=null, figureFileBig=null, tableContent=
样本 长度 | SE (S1)/s | ISE (S2)/s | S1/S2 | S2较S1速度 提升的百分比/% |
| 6 014 | 5.25 | 2.65 | 1.98 | 98.11 |
| 12 028 | 28.10 | 6.51 | 4.32 | 331.64 |
| 18 042 | 97.73 | 12.64 | 7.73 | 673.18 |
| 24 056 | 190.61 | 21.25 | 8.97 | 796.99 |
), ArticleFig(id=1225467196185428884, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1156983786526302431, language=CN, label=表4, caption=
多尺度下两种熵值算法对应不同长度轴瓦磨损状态下轴承振动信号的熵值计算时间
, figureFileSmall=null, figureFileBig=null, tableContent=
样本 长度 | SE (S1)/s | ISE (S2)/s | S1/S2 | S2较S1速度 提升的百分比/% |
| 6 014 | 5.25 | 2.65 | 1.98 | 98.11 |
| 12 028 | 28.10 | 6.51 | 4.32 | 331.64 |
| 18 042 | 97.73 | 12.64 | 7.73 | 673.18 |
| 24 056 | 190.61 | 21.25 | 8.97 | 796.99 |
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