Article(id=1227591033563836478, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1227591023870800760, articleNumber=null, orderNo=null, doi=10.16385/j.cnki.issn.1004-4523.202304021, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1681660800000, receivedDateStr=2023-04-17, revisedDate=1688313600000, revisedDateStr=2023-07-03, acceptedDate=null, acceptedDateStr=null, onlineDate=1770610109940, onlineDateStr=2026-02-09, pubDate=1754755200000, pubDateStr=2025-08-10, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1770610109940, onlineIssueDateStr=2026-02-09, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1770610109940, creator=13701087609, updateTime=1770610109940, updator=13701087609, issue=Issue{id=1227591023870800760, tenantId=1146029695717560320, journalId=1225147924628267009, year='2025', volume='38', issue='8', pageStart='1645', pageEnd='1934', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1770610107611, creator=13701087609, updateTime=1770610373804, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1227592140348388157, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1227591023870800760, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1227592140348388158, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1227591023870800760, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1747, endPage=1755, ext={EN=ArticleExt(id=1227591034054570067, articleId=1227591033563836478, tenantId=1146029695717560320, journalId=1225147924628267009, language=EN, title=Research on rotating machinery fault feature extraction based on multi-scale improved differential filter, columnId=null, journalTitle=Journal of Vibration Engineering, columnName=null, runingTitle=null, highlight=null, articleAbstract=

To accurately extract fault feature information under strong background noise,a multi-scale improved differential filter (MIDIF) is proposed for rotating machinery fault diagnosis. The rotating machinery vibration signal is decomposed into a series of multi-scale improved differential filter signals using MIDIF. In view of that the MIDIF filtered signals exhibit varying extents of validity in revealing fault features,a weighted reconstruction method using correlation analysis is proposed in which the weighted coefficients are counted and distributed to the corresponding MIDIF filtered signals to highlight the effective MIDIF filtered signals and weaken the invalid ones. The weighted coefficients are multiplied with the MIDIF filtered signals under different scales to produce transient impulse components. The fault types of rotating machines are inferred from the fault defect frequencies in the envelope spectrum of the transient impulses. The results show that MIDIF is more accurate in extracting fault features than multi-scale average combination different morphological filter (ACDIF) and multi-scale morphology gradient product operation (MGPO),and that it provides an effective method for rotating machinery fault diagnosis.

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为了准确地提取强烈背景噪声下的故障特征信息,提出了一种多尺度改进差分滤波器(MIDIF)用于旋转机械故障诊断。利用MIDIF将旋转机械振动信号分解为一系列多尺度改进差分滤波信号。针对MIDIF滤波信号在揭示故障特征方面表现出不同程度的有效性,提出了一种基于相关分析的加权重构方法,该方法将加权系数分配给相应的MIDIF滤波信号以突出旋转机械故障特征成分。将加权系数与不同尺度下的MIDIF滤波信号相乘以产生瞬态脉冲分量,并利用包络谱中的故障缺陷频率推断旋转机械的故障类型。试验结果表明,相比多尺度平均组合差值形态滤波(ACDIF)和多尺度形态梯度乘积滤波(MGPO),MIDIF能够更准确地提取故障特征,为旋转机械故障诊断提供了一种有效的方法。

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何清波(1980—),男,博士,教授。E-mail:
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郭俊超(1992—),男,博士,讲师。E-mail:

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郭俊超(1992—),男,博士,讲师。E-mail:

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Main parameters of rolling bearing

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滚动轴承型号滚子直径d/mm节径Dm/mm滚动体个数z接触角β/(°)外圈故障频率fo/Hz内圈故障频率fi/Hz滚动体故障频率fb/Hz保持架故障频率fc/Hz
N40614599083.3135.148.39.3
), ArticleFig(id=1227653595336737551, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591033563836478, language=CN, label=表1, caption=

滚动轴承的主要参数

, figureFileSmall=null, figureFileBig=null, tableContent=
滚动轴承型号滚子直径d/mm节径Dm/mm滚动体个数z接触角β/(°)外圈故障频率fo/Hz内圈故障频率fi/Hz滚动体故障频率fb/Hz保持架故障频率fc/Hz
N40614599083.3135.148.39.3
), ArticleFig(id=1227653595449983762, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227591033563836478, language=EN, label=Tab. 2, caption=

Main parameters of the planetary gearbox

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结构齿数旋转频率frs/Hz啮合频率fpm/Hz故障频率fsf/Hz
太阳轮109.3624.18
行星轮263.6080.619.80
齿圈623.90
行星架1.30
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行星齿轮箱的主要参数

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结构齿数旋转频率frs/Hz啮合频率fpm/Hz故障频率fsf/Hz
太阳轮109.3624.18
行星轮263.6080.619.80
齿圈623.90
行星架1.30
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多尺度改进差分滤波的旋转机械故障特征提取研究
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郭俊超 1 , 何清波 2 , 甄冬 3 , 谷丰收 4
振动工程学报 | 2025,38(8): 1747-1755
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振动工程学报 | 2025, 38(8): 1747-1755
多尺度改进差分滤波的旋转机械故障特征提取研究
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郭俊超1 , 何清波2 , 甄冬3, 谷丰收4
作者信息
  • 1.天津工业大学控制科学与工程学院,天津 300387
  • 2.上海交通大学机械与动力工程学院,上海 200240
  • 3.河北工业大学机械工程学院,天津 300130
  • 4.哈德斯菲尔德大学效率与效能工程中心,哈德斯菲尔德英国,HD1 3DH
  • 郭俊超(1992—),男,博士,讲师。E-mail:

通讯作者:

何清波(1980—),男,博士,教授。E-mail:
Research on rotating machinery fault feature extraction based on multi-scale improved differential filter
Junchao GUO1 , Qingbo HE2 , Dong ZHEN3, Fengshou GU4
Affiliations
  • 1.School of Control Science and Engineering,Tiangong University,Tianjin 300387,China
  • 2.School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China
  • 3.School of Mechanical Engineering,Hebei University of Technology,Tianjin 300130,China
  • 4.Centre for Efficiency and Performance Engineering,University of Huddersfield,Huddersfield HD1 3DH,UK
出版时间: 2025-08-10 doi: 10.16385/j.cnki.issn.1004-4523.202304021
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为了准确地提取强烈背景噪声下的故障特征信息,提出了一种多尺度改进差分滤波器(MIDIF)用于旋转机械故障诊断。利用MIDIF将旋转机械振动信号分解为一系列多尺度改进差分滤波信号。针对MIDIF滤波信号在揭示故障特征方面表现出不同程度的有效性,提出了一种基于相关分析的加权重构方法,该方法将加权系数分配给相应的MIDIF滤波信号以突出旋转机械故障特征成分。将加权系数与不同尺度下的MIDIF滤波信号相乘以产生瞬态脉冲分量,并利用包络谱中的故障缺陷频率推断旋转机械的故障类型。试验结果表明,相比多尺度平均组合差值形态滤波(ACDIF)和多尺度形态梯度乘积滤波(MGPO),MIDIF能够更准确地提取故障特征,为旋转机械故障诊断提供了一种有效的方法。

多尺度改进差分滤波器  /  相关系数  /  旋转机械  /  故障诊断

To accurately extract fault feature information under strong background noise,a multi-scale improved differential filter (MIDIF) is proposed for rotating machinery fault diagnosis. The rotating machinery vibration signal is decomposed into a series of multi-scale improved differential filter signals using MIDIF. In view of that the MIDIF filtered signals exhibit varying extents of validity in revealing fault features,a weighted reconstruction method using correlation analysis is proposed in which the weighted coefficients are counted and distributed to the corresponding MIDIF filtered signals to highlight the effective MIDIF filtered signals and weaken the invalid ones. The weighted coefficients are multiplied with the MIDIF filtered signals under different scales to produce transient impulse components. The fault types of rotating machines are inferred from the fault defect frequencies in the envelope spectrum of the transient impulses. The results show that MIDIF is more accurate in extracting fault features than multi-scale average combination different morphological filter (ACDIF) and multi-scale morphology gradient product operation (MGPO),and that it provides an effective method for rotating machinery fault diagnosis.

multi-scale improved differential filter  /  correlation coefficients  /  rotating machinery  /  fault diagnosis
郭俊超, 何清波, 甄冬, 谷丰收. 多尺度改进差分滤波的旋转机械故障特征提取研究. 振动工程学报, 2025 , 38 (8) : 1747 -1755 . DOI: 10.16385/j.cnki.issn.1004-4523.202304021
Junchao GUO, Qingbo HE, Dong ZHEN, Fengshou GU. Research on rotating machinery fault feature extraction based on multi-scale improved differential filter[J]. Journal of Vibration Engineering, 2025 , 38 (8) : 1747 -1755 . DOI: 10.16385/j.cnki.issn.1004-4523.202304021
旋转机械作为机械设备中重要的部件,由于实际的工作条件不可避免地会产生各种故障,将影响整个设备的安全稳定运行。因此,旋转机械的故障诊断对于确保机械设备的可靠性和避免灾难性事故至关重要[1-2]。当发生局部故障时,通过缺陷与接触面的摩擦会产生瞬态脉冲成分。然而,由于强烈的随机噪声和谐波分量干扰,瞬态脉冲无法有效地从振动信号中分离出来[3-4]。因此,消除振动信号中随机噪声和谐波分量以获取故障特征对于旋转机械的故障检测至关重要。
目前,许多典型故障诊断方法用于提取旋转机械的故障特征。例如,WANG等[5]应用集合局部均值分解消除快速谱峭度中的内部噪声以提高故障特征提取的准确性。张志强等[6]探索了一种加权稀疏方法,以提取强背景噪声下行星齿轮箱的瞬态特征。ZHANG等[7]提出应用经验小波变换作为滤波器来减少背景噪声,以增强齿轮箱的脉冲分量。程军圣等[8]研发了一种非线性模式分解方法来获取行星齿轮箱的复合故障特征。LYU等[9]提出了一种改进的最大相关峰度反褶用于减少行星齿轮箱的背景噪声,以突出脉冲特性和增强故障检测精度。尽管上述方法已被广泛用于机械故障诊断,但它们专注于去噪效果,而忽略了信号的几何特性。因此,这些方法在消除背景噪声时会不可避免地削弱有用的故障特征信息。
形态学滤波器(MF)是一种出色的抗噪声的信号处理方法,其通过结构元素(SE)修改信号的几何特性。凭借这一优势,MF在旋转机械故障诊断中受到了广泛的关注。例如,GUO等[10]设计了一种组合形态滤波器(CMF),通过消除信号幅值的统计偏差来突出信号中的脉冲分量。LI等[11]提出了一种改进的形态梯度滤波器(MG),其使用谐波波形提取脉冲特征。然而,这些滤波器属于单尺度形态分析方法,其SE尺度是固定的,因此在提取故障特征时可能缺乏完整性。针对单尺度形态分析的不足,HU等[12]提出了一种多尺度形态分析方法,并证明其在旋转机械故障诊断中优于单尺度滤波器。随后,OSMAN等[13]开发了一种多尺度差分滤波器(DIF)来揭示滚动轴承的故障特征。GUO等[14]提出了一种基于多尺度增强滤波器(EAVG)和模糊推理的轴承故障检测混合算法。LI等[15]构建了一种改进的多尺度差分滤波器(COOC)来检测滚动轴承故障。由于上述多尺度形态滤波器只能同时提取信号中的正脉冲或负脉冲,DONG等[16]提出了一种基于闭和开算子组合的平均滤波器(AVG),以获得振动信号的双向脉冲。然而,AVG对脉冲幅值的提取能力被削弱。考虑到多尺度黑顶帽(MBTH)表示原始信号与开算子的差值,主要用于获得负脉冲,而多尺度白顶帽(MWTH)表示原始信号与闭算子之间的差值,用于提取正脉冲。鉴于此,在MBTH和MWTH的基础上,借鉴差分滤波变换的思想,本文提出了一种多尺度改进差分滤波器(MIDIF)用于分析含有循环脉冲的旋转机械振动信号。然而,如何有效地确定MIDIF中的加权系数以提高瞬态脉冲分量提取的准确性,仍然是一项具有挑战性的任务。
为了解决上述问题,目前研究学者已经进行了大量的研究。鄢小安等[17]提出一种平均多尺度形态梯度滤波器来检测齿轮故障,但其加权系数在滤波器中是相同的。LI等[18]开发一种加权平均多尺度形态梯度(WAMMG)来提取轴承故障特征。在WAMMG中,大尺度加权系数可以有效地抑制噪声,而用于表征故障特征的脉冲信息由小尺度加权系数保留。此外,WAMMG方法缺乏自适应能力。LI等[19]和邓飞跃等[20]使用遗传算法(GA)和粒子群优化(PSO)构建了一种自适应加权算法,以准确地获取加权系数。YAN等[21]和LI等[22]提出使用特征能量因子(FEF)和频域峰度(FDK)计算加权系数。但GA和PSO受适应度函数影响,而FEF和FDK在确定加权系数时只考虑单一异常模式下的故障信号,不与正常信号进行比较。因此,极难在最终输出信号中突出表征更多有效的故障分量。本文提出一种加权系数算法,其基于异常和正常情况下采集的振动信号与其MIDIF滤波信号之间的相关系数。该算法通过去除异常信号和正常信号之间的共同信息,可以极大地增强敏感故障分量且削弱不敏感故障分量。基于以上考虑,提出利用相关系数法对MIDIF的加权系数进行优化。
综上所述,提出了一种基于MBTH和MWTH差值的MIDIF,用于旋转机械的故障特征提取。MIDIF有效地获取振动信号中的双向脉冲成分,以抑制背景噪声来增强旋转机械故障特征。同时利用相关分析方法优化其MIDIF滤波信号的权重系数,可以有效地突出有用的MIDIF滤波信号和减少无效MIDIF信号。通过仿真信号和试验案例分析验证了MIDIF在故障特征提取方面的性能,并通过与现有算法(多尺度平均组合差值形态滤波(ACDIF)和多尺度形态梯度乘积滤波(MGPO))进行对比,验证了其有效性和可行性。
假设输入信号f(n)和所选结构元素g(m)的定义域为f=(0,1,…,N-1)和g=(0,1,…,M-1)(MN),其中MN分别表示fg的信号点数。膨胀和腐蚀分别定义为:
(fg)(n)=max{f(n-m)+g(m)}
(fΘg)(n)=min{f(n+m)-g(m)}
式中,⊕和Θ分别表示膨胀算子和腐蚀算子。腐蚀算子可以去除正脉冲;相反,膨胀算子可以减少负脉冲。
形态梯度(MG)表示为腐蚀和膨胀之间的差值运算,定义为:
MG(f(n))=(fg)(n)-(fΘg)(n)
开、闭算子通过级联膨胀和腐蚀算子来构造,定义为:
(fοg)(n)=(fΘgg)(n)
(fg)(n)=(fgΘg)(n)
式中,ο分别表示开算子和闭算子。开算子减少正脉冲并保留负脉冲,而闭算子保留正脉冲并去除负脉冲。
差分滤波器(DIF)表示闭和开之间的差值运算,定义为:
DIF(f(n))=(fg)(n)-(fοg)(n)=((fg)(n)-f(n))+(f(n)-(fοg)(n))=BTH+WTH
式中,BTH=(fg)(n)-f(n)WTH=fn)-(fοg)(n)分别表示黑顶帽(BTH)和白顶帽(WTH)。前者用于提取负脉冲,而后者用于获取正脉冲。
考虑到原始信号中同时存在正、负脉冲,基于BTH和WTH的改进差分滤波器(IDIF)定义为:
IDIF(f(n))=2f(n)-(fοg)(n)-(fg)(n)
对仿真信号x(t)=sin (10πt)+n(t)(如图1所示)进行分析并与不同形态的滤波器进行比较,以评估IDIF获取脉冲成分的性能。信号采样频率为1024 Hz,数据样本为1024,n(t)表示幅度为1的一系列正、负脉冲,且同一脉冲成分之间的间隔为400个采样点。随后,4个基本形态算子(MOs)使用长度L=10的扁平型SE来分析仿真信号。
图2显示了4个基本MOs的滤波信号。然而,MOs只能提取正向或负向脉冲,不能同时获得正向和负向脉冲。随后,使用不同的MFs(MG、AVG、DIF、COOC、BTH、WTH和IDIF)来处理图1所示的信号,检测结果如图3所示。可以发现MG、DIF和COOC能够提取脉冲,但是所有的负向脉冲都转化为正向脉冲。虽然AVG可以获得正、负向脉冲,但提取的脉冲幅度被削弱。WTH只能提取正向脉冲,而BTH可以提取负向脉冲且被转换为负向脉冲。IDIF的滤波结果如图3(g)所示,能够获得双向脉冲。因此,验证了IDIF对于提取循环脉冲更有效。
为了更准确地挖掘故障特征,采用多尺度改进差分滤波器对信号进行分析。假设gm)为单位SE,εε=1,2,…,k)为尺度,尺度ε中使用的SE表示为:
εg(m)=g(m)g(m)g(m)k-1
多尺度基本形态算子表示为:
(fεg)(n)=fgg(n)k-1
(fΘεg)(n)=fΘgΘΘg(n)k-1
(fοεg)(n)=((fΘεg)εg)(n)
(fεg)(n)=((fεg)Θεg)(n)
随后,进一步定义了多尺度黑顶帽(MBTH)和多尺度白顶帽(MWTH)形态滤波器,如下式所示:
MBTHε(f(n))=(fεg)(n)-f(n)
MWTHε(f(n))=f(n)-(fοεg)(n)
相应地,MBTH用于提取负脉冲,而MWTH用于获取正脉冲。考虑到原始信号中存在双向脉冲,多尺度改进差分滤波器(MIDIF)表示为MBTH和MWTH之差,其定义如下:
MIDIFε(f(n))=2f(n)-(fοεg)(n)-(fεg)(n)
考虑到大尺度可以抑制背景噪声,但可能会破坏有用的信号细节,而小尺度可以平滑信号的几何特征,但可能无法有效抑制噪声。因此,将MIDIF的加权平均值作为最终输出:
MIDIF(f(n))=ε=1εmaxω(ε)MIDIFε(f(n))
式中,ω(ε)表示不同尺度下的加权系数(ε=1,2,…,εmax),会影响MIDIF的检测结果。因此,有必要探索一种有效的方案来确定加权系数ω(ε),以便在最终输出信号中突出显示更多有用的故障分量。本文提出了一种基于相关系数的加权系数算法来确定加权系数ω(ε),其具体实现过程总结如下:
步骤1:定义f^(n)f(n)分别为异常情况信号和正常情况信号。
步骤2:计算各尺度的异常情况信号f^(n)与滤波信号MIDIF(f^(n)εg)之间的相关系数uε,可定义为:
uε=n=0N-1(f^(n)-f^¯)(MIDIF(f^(n)εg)-MIDIF(f^)¯)n=0N-1(f^(n)-f^¯)2n=0N-1(MIDIF(f^(n)εg)-MIDIF(f^)¯)2
式中,f^¯MIDIF(f^)¯分别表示f^(n)MIDIF(f^(n)εg)的平均值。
步骤3:计算各尺度的正常情况信号f(n)与滤波信号MIDIF(f(n)εg)的相关系数φε,可定义为:
φε=n=0N-1(f(n)-f¯)(MIDIF(f(n)εg)-MIDIF(f)¯)n=0N-1(f(n)-f¯)2n=0N-1(MIDIF(f(n)εg)-MIDIF(f)¯)2
式中,f¯MIDIF(f)¯分别表示f(n)MIDIF(f(n)εg)的平均值。
步骤4:计算故障相关系数ηε
ηε=|uε-φε|
步骤5:计算每个尺度ε的加权系数ωε
ωε=ηε/ε=1εmaxηε
本节设计了一个模拟信号来说明MIDIF在提取故障特征方面的性能。当滚动轴承发生局部故障时,其振动形式表现为周期性瞬态脉冲。然而,瞬态脉冲不可避免地被随机噪声所掩盖。为了模拟滚动轴承的实际信号,其故障模型定义如下:
x(t)=n=-LLAn(ti)e-α(ti)sin (2πfct)+N(t)
式中,An表示第n个故障脉冲信号的幅值;L表示故障脉冲的数目;ti=t-(n/fo)fo=32 Hz表示故障特征频率;αfc分别表示衰减参数和共振频率;N(t)表示具有信噪比为-5 dB的高斯白噪声。
图4为仿真信号的波形、频谱和包络谱。从频谱中无法识别故障频率fo及其谐波。由图4(c)可知,只能找到前两个故障缺陷频率(fo2fo),高次谐波(3fo4fo5fo6fo)无法识别。
为了准确地提取故障频率fo及其谐波,利用MIDIF将仿真信号分解为一系列MIDIFs。然后,计算异常或正常情况下的信号与不同尺度下MIDIFs的相关系数。随后,计算异常信号相关系数与正常信号相关系数的差值,以去除通用信息来突出模拟信号的故障分量。最后,将对不同尺度的故障相关系数进行归一化,计算出MIDIF和多尺度差分滤波器(MDIF)的加权系数,其结果如图5所示。从图5(a)中可以清楚地看出故障频率fo及其谐波。相比之下,图5(b)中前3个故障特征频率可以被识别出来,但在低频段存在丰富的干扰频率。这意味着MIDIF方法能够比MDIF更有效地获取故障成分。
为了证明MIDIF的优势,采用多尺度平均组合差值形态滤波器(ACDIF)[23]和多尺度形态梯度乘积滤波器(MGPO)[24] 处理图4(a)中呈现的仿真信号。根据文献[23],ACDIF由两个基本级联算子的平均加权组合而成,其通过基于Teager能量峭度的加权系数与不同SE尺度下的ACDIF信号相乘得到ACDIF滤波信号,如图6所示。从图6中只能找到故障频率fo,高次谐波无法识别且干扰谐波掺杂在低频段。根据文献[24],MGPO是由两个梯度算子(MG和COOC)的乘积形成的,其通过基于特征能量因子(FEF)的加权系数和不同SE尺度下的MGPO信号相乘获取MGPO滤波信号,如图7所示。在图7中,虽然可以识别到故障频率fo及其谐波,但仍存在一些谐波干扰频率。因此,仿真分析结果表明在特征提取方面MIDIF优于ACDIF和MGPO方法。
为了进一步证明MIDIF在强背景噪声下提取故障特征的性能,本研究利用故障缺陷指数来评估MIDIF在不同SNRs下的性能。对于给定的故障缺陷频率f0,故障缺陷指数β可以定义如下:
{β=α(f0)+α(2f0)+α(3f0)3α(f0)=A(f0)mean(A(f0-10),A(f0+10))
式中,A(f0)表示故障缺陷频率的包络谱幅值;mean(⋅)表示平均值。
图8给出了MIDIF、MDIF、ACDIF和MGPO在不同SNRs下的故障缺陷指数。可以发现,MIDIF在不同SNRs下比其他3种算法具有更强的故障诊断能力。
为了说明加权系数对MIDIF的影响,采用加权多尺度改进差分滤波器(WMIDIF)和传统的多尺度改进差分滤波器(TMIDIF)来处理图4(a)中的波形。WMIDIF滤波信号是通过将加权系数与不同尺度下的MIDIF滤波信号直接相乘产生的,其结果如图9所示。从图9中可以看出,故障频率fo及其谐波可以被清晰识别,但干扰频率仍在高次谐波附近。TMIDIF是通过直接平均所有尺度的IDIF滤波信号形成的,其处理结果如图10所示。虽然故障频率fo及其谐波可以被观察到,但干扰频率的幅值明显高于故障频率的幅值。通过对比可以得出,相关系数法得到的加权系数能更好地突出测量信号中有用的故障成分。综上所述,对模拟信号的综合对比研究结果表明,基于相关系数的MIDIF方法在故障诊断中更为有效。
为了验证MIDIF在故障特征提取方面的能力,采用图11所示的滚动轴承试验台进行试验。试验台主要包括发电机、联轴器、轴承支座和直流电机,且加速度传感器安装在轴承座的垂直方向。采样频率和数据长度分别为13529 Hz和100000,电动机转速为1450 r/min。图12显示了滚动轴承外圈故障。滚动轴承的尺寸参数和故障频率如表1所示。
滚动轴承振动信号的波形、频谱和包络谱如图13所示。从频谱中无法识别轴承故障频率fo及其谐波。由图13(c)可知,轴承故障频率fo被识别,但其高次谐波被背景噪声和干扰分量混合。
为了提取故障频率fo及其谐波,利用MIDIF分析滚动轴承故障信号。首先,故障信号通过MIDIF分解为一系列MIDIFs,并计算了MIDIF与故障信号之间的相关系数uε,以及MIDIF与正常方位信号之间的相关系数φε。然后,通过uεφε之间的差值计算故障相关系数,以突出滚动轴承的故障成分。最后,通过对不同尺度的故障相关系数进行归一化,计算出MIDIF的加权系数,其分析结果如图14所示。在图14中能够看到轴承外圈故障fo的谱线。
为了比较,采用ACDIF和MGPO方法分析图13(a)的波形,其处理结果如图1516所示。由图15可知,故障频率fo及2fo能够被识别,但高次谐波3fo无法被识别。在图16中,只有故障频率fo能够被识别,并且低频段存在随机噪声和无关干扰。
行星齿轮箱试验台如图17所示,其主要由电机、平行轴齿轮、传感器、行星齿轮箱和发电机所组成。行星齿轮箱振动信号由安装在行星齿轮箱顶部的加速度传感器所获取,其信号的采样频率和数据长度分别为100000 Hz和3000000,电动机转速为300 r/min。图18显示了太阳轮点蚀故障。行星齿轮箱的尺寸参数和故障频率如表2所示。
太阳轮点蚀故障信号的波形、频谱和包络谱如图19所示。从图19(b)频谱中无法准确地识别太阳轮点蚀故障频率。由图19(c)可知,太阳轮故障频率fsf2fsf及其组合频率fsf±frs2fsf-frs可以被识别,但太阳轮旋转频率frs2fsf+frs无法被识别。
为了提取太阳轮点蚀故障相关频率,利用MIDIF分析太阳轮点蚀故障信号。首先,故障信号通过MIDIF分解为一系列MIDIFs,计算MIDIFs与故障信号之间的相关系数uε,以及MIDIFs与正常信号之间的相关系数φε。随后,通过uεφε之间的差值计算故障相关系数,以获得太阳轮的故障成分。最后,通过对不同尺度的故障相关系数进行归一化,计算出MIDIF的加权系数,其结果如图20所示。能够清晰地看到太阳轮旋转频率frs、太阳轮故障频率fsf和组合频率fsf+frs及其谐波。
为了比较,采用ACDIF和MGPO方法分析太阳轮点蚀故障信号的波形,其处理结果如图2122所示。在图21中,仅能识别太阳轮故障频率fsf2fst及其组合频率fsf+frs2fsf-frs图22显示了ACDIF滤波结果,从图中可以识别出太阳齿轮旋转频率frs、太阳齿轮缺陷频率fsf及其谐波和组合频率fsf-frs,但不能识别出组合频率fsf+frs2fsf±frs
本文提出了一种自适应多尺度形态学滤波器(AMIDIF),用于去除随机噪声和谐波频率的干扰以增强旋转机械的瞬态脉冲成分。通过对滚动轴承和行星齿轮箱故障检测的研究,得出以下结论:
(1)借鉴多尺度黑、白顶帽算子和差分滤波变换的思想,提出了一种多尺度改进差分滤波器(MIDIF)。通过分析形态算子提取脉冲的特性,证明了MIDIF能够有效地获取双向脉冲,适用于分析含有循环脉冲的旋转机械振动信号。
(2)针对MIDIF中加权系数需要人为经验性选取的问题,提出了一种基于相关系数的加权重建算法,通过去除异常信号和正常信号之间的共同信息,以突出有用的MIDIFs和削弱其他MIDIFs的干扰。
(3)通过滚动轴承和行星齿轮箱故障的诊断,验证了MIDIF能够有效地增强旋转机械的瞬态脉冲成分。此外,MIDIF在故障特征提取方面优于多尺度差分形态滤波器(ACDIF和MGPO)。
  • 天津市自然科学基金资助项目(23JCQNJC00550)
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2025年第38卷第8期
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doi: 10.16385/j.cnki.issn.1004-4523.202304021
  • 接收时间:2023-04-17
  • 首发时间:2026-02-09
  • 出版时间:2025-08-10
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  • 收稿日期:2023-04-17
  • 修回日期:2023-07-03
基金
天津市自然科学基金资助项目(23JCQNJC00550)
作者信息
    1.天津工业大学控制科学与工程学院,天津 300387
    2.上海交通大学机械与动力工程学院,上海 200240
    3.河北工业大学机械工程学院,天津 300130
    4.哈德斯菲尔德大学效率与效能工程中心,哈德斯菲尔德英国,HD1 3DH

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何清波(1980—),男,博士,教授。E-mail:
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Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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