铁路机车孔缝和线缆耦合的电磁拓扑-研究

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1、北京交通人学硕士学位论文ABSTRACTABSTRACT：ElectromagneticTopology(EMT)wasraisedbytheUnitedStates’CEBauminthemid-1970s，whichwasprimarilyusedtopreventhigh—powerelectromagneticpulse(EMP)fromdisturbingmaddamagingmodemelectronicsystemsAfterdecadesofresearchanddevelopment，EMTbeginstobeappliedtoothermagneticfieldtop

2、ology．However,theapplicationofEMTisstillatarIearlystagewhencomingdowntopowerelectronicequipmentinlocomotiveBasedonEMTmethod，thisthesisstudiesElectromagneticCompatibility(EMC)ofpowerelectronicequipmentinlocomotive，focusingonaperturecouplingandnear-fieldcablecouplingFirstly,thestatusofEMT,analysism

3、ethodanditsadvantagesarebrieflyintroducedThentheinternalandextemalelectromagneticenvironmentofrailwaypowerelectronicsystemisanalyzedaswell，especiallythewidespreadaperturecouplingandnear-fieldcouplingSpecificEMTmodelsofthesetwocouplingsal-ebuilttoprovideconvenienceforsolvingsuchkindsofproblemsGene

4、ralEMTmethodisusedinaperturecouplingprobleminrailwaylocomotivesystemEMTregardsradiatedsourceasanodewhichtravelsthroughtheapertureontheshieldingwallandcouplestothetrmlsmissionlineontheothersideofthewallFortheconvenienceofanalysis，anextraequivalentcouplingnodeisaddedwhichisequivalenttotheeffectofra

5、diatedsourceonthetransmissionlineAtlast，theinterferenceonthetWOendsoftransmissionlineisqualitativelyanalyzedtoJudgeaperturecouplinginterferenceBasedonEMTmodel，field—circuittopologymodelisestablishedtodeterminestatefunctionsofthenodesandtransferfunctionsofthetransmissionchannelsUniversalsignifican

6、tconclusionisderivedusingBLTequationandextendedBLTequation．withmathematicalmodelsetuptOfulfillthesimulationFinallytheresearchresultsarevefifiedwithexistedprinciplesandthedesignedcorrespondingexperimentsForthegeneralexistednear-fieldcouplingproblemsinrailwaylocomotivesystem，thesameanalyzingtllough

7、tasaperturecouplingisappliedAtfirst．circuitstructure口aphisdrawnwhichisconsistedofdistributedparametersAfterthatEMTgraphisabstrⅫtdThennodesandtransmissionchannelsaredetenfunedOnthederivationoftransmissionthnctioncombine