基于角域四阶累积量切片谱的柴油机连杆轴承故障特征提取.pdf

《基于角域四阶累积量切片谱的柴油机连杆轴承故障特征提取.pdf》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。

1、振动与冲击第33卷第11期JOURNALOFVIBRATIONANDSHOCK基于角域四阶累积量切片谱的柴油机连杆轴承故障特征提取沈虹一，赵红东，梅检民，赵慧敏，张大鹏，任金成(1．河北工业大学信息工程学院，天津300401；2．军事交通学院军用车辆系，天津300161)摘要：提出了一种角域四阶累积量切片谱方法，应用于提取连杆轴承微弱故障特征。首先，对升速过程振动信号进行阶比重采样得到角域平稳信号，再计算其四阶累积量对角切片谱，构成角域四阶累积量切片谱，用于分析不同转速区间、不同测试位置下的非稳态

2、信号，提取连杆轴承微弱故障特征。试验结果表明：角域重采样与四阶累积量对角切片谱相结合，既能分析非稳态信号，又能抑制噪声干扰；特定阶比带内的角域四阶累积量对角切片谱的能量和峰值，能有效识别连杆轴承各种技术状态，可以作为连杆轴承磨损故障的特征参数；并得出了敏感测试位置、敏感转速区间和特征阶比带。关键词：角域重采样；四阶累积量切片谱；连杆轴承；特征提取中图分类号：TK428文献标志码：ADOI：10．13465／j．cnki．jVS．2014．11．017Faultfeatureextractionof

3、connectingrodbearingsofadieselenginebasedonangledomainfourth-ordercumulantslicespectrumSHENHong’，ZHAOHong—dong，MEIJian—min，ZHAOHui—min，ZHANGDa-peng。，RENJin—cheng(1．DepartmentofInformationEngineering，HebeiUniversityofTechnology，Tianjin300401，China；2．Mi

4、litaryVehicleDepartment，MilitaryTransportationUniversity，Tianjin300161，China)Abstract：Amethodbasedonangledomainfourth—ordercumulantslicespectrumwasproposedtoextractweakfaultfeaturesofconnectingrodbearings．Firstly，theunsteadyvibrationsignalsinaccelerat

5、ingprocesswereorder—re—sampledandthesteadysignalswereobtainedinangledomain，thenthefourth—ordercumulantdiagonalslicespectrumwascalculatedtoconstitutetheangledomainfourth—ordercumulantslicespectrum，itwasusedtoanalyzeunsteadysignalsindifferentrotatingspe

6、edintervalsandatdifferentmeasurepositionstoextractweakfaultfeaturesofconnectingrodbearings．Thetestresultsshowedthatthecombinationofangledomainre-samplingandthefourth—ordercumulantdiagonalslicespectrumcanbeusednotonlytoanalyzeunsteadysignals，butalsotos

7、uppressnoiseinterference；theenergyandthepeaksoftheangledomainfourth—ordercumulantslicespectruminacertainorderbandcanbeusedtodistinguishdifferenttechnicalstatesofconnectingrodbearingseffectively，itcanbetakenasthefeatureparameterofconnectingrodbearingfa

8、ults；thesensitivemeasuringpositions，rotatingspeedintervalsandfeatureorderbandscanbeobtained．Keywords：orderre—sample；fourth—ordercumulantslicespectrum；connectingrodbearing；featureextraction连杆轴承是发动机的重要部件，其技术状态的好波基函数的选择，文献[2]将循环平稳理论应用于连杆坏直接影响发动机的