基于信号处理的电气化铁路弓网接触压力分析

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1、西南交通大学硕士研究生学位论文第1I页关键词：接触压力、平稳性、经验模式分解、小波变换西南交通大学硕士研究生学位论文第1II页AbstractThefluctuationofthecontactforcehasalreadybeenregardedasanindexthatevaluatesthecontactlineunevennessdegreeandthecurrentcollectionperformancebetweenthepantographandthecatenary．Inrecentyears，construct

2、ingcatenaryspectrumhasbecomeanewideatoevaluatetheoveralldynamicperformanceofcatenaryandpantographsystem．Inthepaper,thecontactforcesignalsareanalyzedwiththemodernsignalprocessingmethods．Forthestationarityofcontactforceandthestatisticscharacteristicintimedomainandfreque

3、ncydomain，theworkislistedasfollows：1)Testingthestationarityoftherandomsignalisanimportantpreprocessingstepbeforestudyingitsstatisticalfeature．Firstly,themethodsontestingthestationarityofthesignalsarefullysummarized．ThenbasedonthedataofBeijing—GuangzhoulineandShanghai-

4、Kunmingline(twodatapointssampledpermile)，thestationarityofcontactforceisanalyzedbybothusingthemethodsinfrequencydomain,whichcomparesthetime-frequencyspectrumsimilarityofthesignal，suchassurrogates-basedtestandspectrum-basedtest，andusingthemethodsintimedomain，suchasther

5、untestandaseriesofunitroottests．Thetestingresultsshowthat，whetherthecontactforcesignalcanbeconsideredasstationary,relativelytoagivenobservationscale．Fromalongerobservationscale(sampledistanceisoverl000m)，thecontactforcesectionsCanbeconsiderasstationary；fromasmallobser

6、vationscale(sampledistanceisbelow500m)，thedynamiccontactforceappearsobviousnon-stationary．Atlast，anon-stationarityindexisproposedasaquantitativetooltoassessthefluctuationsofthecontactforce．2)Thecontactforceisanalyzedbythetimedomainindexeswhichareappliedtoinitiallyeval

7、uatetheunevennessdegreeofthecontactlineandmonitorthestateofpantographandcontactlines．3)Basedonwavelettransformtheoryandempiricalmodedecomposition，thecontactforcewavelengthidentificationprocedureispresented．Asaresult，thewavelengthcompositioninnormalsectionsandabnormals

8、ectionsareidentifiedandlocated．Firstly，thecontactforceispretreatedbyusingEMDandthesignalconcludingthewavelengthrangingfromlm