机车轴承工况监测与故障诊断系统开发

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1、北京交通大学硕士学位论文机车轴承工况监测与故障诊断系统开发姓名：扈炳涛申请学位级别：硕士专业：机械电子工程指导教师：杨江天20081101ABSTRACrABSTRACTTherollingelementbearingisoneofthemostimportantunitsinlocomotiveandcar．Bearingfailureswouldprobablybringgreatsufferingtorailwaytransportationandsafety．Itisofgreatimportancetodetectincipientfa

2、iluresinlocomotivebearingsasearlyaspossible．Therefore，bearingsignalanalysisusingthewavelettransformisexamined，andanovelconditionmonitoringandfaultdiagnosticsystemforlocomotivebearingisdeveloped．Thecontributionsandconclusionsaremadeasfollows：Anoverviewofthemechanismanalysisofl

3、ocomotivebearingfaultsispresented，whichincludethecauseofthelocomotivebearingfaults，basicforms，vibrationmechanism，vibrationmodelandfaultcharacteristicfi'equency．Sometechniquesforfaultdiagnosisofrollingelementbearingareshown，suchastimedomainanalysis，frequencydomainanalysis，Hilb

4、erttransform，wavelettransforillandSOon．Twomethodswhichappliedwaveletanalysistofaultdiagnosisisproposed，whicharethenoisereductionanalysismethodusingwavelettransformandfeatureextractionanalysismethodbywaveletpackettransform．Basedonthetheoryofwaveletanalysis，thewavelettransformi

5、susedtoreducethenoiseofthevibrationsignalofbearings．Furthermore，thefaultcharacterfrequencyofrollerbearingsandtheenergycharacteroflowestcrunodesareextractedbymeansofwaveletpackagemultiplayerdecomposeandreconstruction．Theeffectivenessandpracticabilityoftheproposedmethodsisverif

6、iedbythecomputergeneratedsignalandthevibrationexperimentonbearingtestrig．Basedontheinvestigationsmentionedabove，amonitoringanddiagnosticsystemforlocomotivebearingsisdevelopedThesystemissuccessfulappliedtothebearingsoftherunninggearofalocomotive．Theeffectivenessofproposedsyste

7、misverifiedbystationarytest．KeyWords：Locomotive；Bearings；Faultdignosis；Waveletanalysis；Waveletpacketresolution；De-noisingIlI北京交通人学硕士论文独创性声明本人声明所呈交的学位论文是本人在导师指导下进行的研究工作和取得的研究成果，除了文中特别加以标注和致谢之处外，论文中不包含其他人已经发表或撰写过的研究成果，也不包含为获得北京交通大学或其他教育机构的学位或证书而使用过的材料。与我一同工作的同志对本研究所做的任何贡献均已在论文中

8、作了明确的说明并表示了谢意。学位论文作者签名：签字日期：年月学位论文版权使用授权书本学位论文作者完全了解北京交通大学有关保留、使用学位论