对煤矿矿井提升机钢丝绳损毁的钢丝检测装置研究外文文献翻译中英文翻译.docx
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对煤矿矿井提升机钢丝绳损毁的钢丝检测装置研究外文文献翻译中英文翻译.docx
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对煤矿矿井提升机钢丝绳损毁的钢丝检测装置研究外文文献翻译中英文翻译
附录:
外文资料与中文翻译
外文资料:
ResearchonDetectionDeviceforBrokenWiresofCoalMine-HoistCable
WANGHong-yao1,HUAGang1,TIANJie2
1SchoolofInformationandElectricalEngineering,ChinaUniversityofMining&Technology,Xuzhou,Jiangsu221008,China
2SchoolofMechanicalElectronicandInformationEngineering,ChinaUniversityofMining&Technology,Beijing100083,China
Abstract:
Inordertoovercometheflawsofpresentdomesticdevicesfordetectingfaultywiressuchaslowprecision,lowsensitivityandinstability,anewinstrumentfordetectingandprocessingthesignaloffluxleakagecausedbybrokenwiresofcoalmine-hoistcablesisinvestigated.Theprincipleofstrongmagneticdetectionwasadoptedintheequipment.Wiresweremagnetizedbyapre-magneticheadtoreachmagnetizationsaturation.Ourspecialfeatureisthatthenumberofflux-gatesinstalledalongthecircledirectiononthewallofsensorsistwiceaslargeasthenumberofstrandsinthewirecable.Neighboringcomponentsareconnectedinseriesandtheinterferenceonthesurfaceofthewirecable,producedbyleakagefromthefluxfieldofthewirestrands,isefficientlyfiltered.Thesampledsignalsequenceproducedbybrokenwires,whichischaracterizedbyathree-dimensionaldistributionoftheflux-leakagefieldonthesurfaceofthewirecable,canbedimensionallycondensedandcharacteristicallyextracted.AmodelofaBPneuralnetworkisbuiltandthealgorithmoftheBPneuralnetworkisthenusedtoidentifythenumberofbrokenwiresquantitatively.Inourresearch,weuseda6×37+FC,24mmwirecableasourtestobject.Randomlyseveralwireswereartificiallybrokenanddamagedtodifferentdegrees.Theexperimentswerecarriedout100timestoobtaindatafor100groupsfromoursamples.ThedatawerethenenteredintotheBPneuralnetworkandtrained.Thenetworkwasthenusedtoidentifyatotal16wires,brokenatfivedifferentlocations.Thetestdataprovesthatournewdevicecanenhancetheprecisionindetectingbrokenanddamagedwires.
Keywords:
wirecable;brokenwire;signalprocessing;detectiondevice
CLCnumber:
TB42
1Introduction
Itiswell-knownthatcoalmine-hoistcablesareanimportantpartincoalmine-hoistsortransportationsystems.Wiresare,infact,subjectedtobreakageduetowear,corrosionandfatigue.Theextentofdamageandthecarryingcapacityofwiresaredirectlyrelatedtothesafetyofequipmentandstaff.Atpresent,therearemanydetectiondevicesforbrokensteelcablesmanufacturedinChina,butmostdevicesdonotmeettheconditionsideallyrequiredinpractice.Thereasonsarelargelythecomplexstructureofwires,badworkingconditions,themultiplicityanduncertaintyofbrokenwires.Itisthereforequitedifficulttodetectsignsofbrokenwiresaswellastoanalyzeandprocessdetectedsignalofbrokenwiresincables[1].Anewinstrumentforbrokenwiresdetectionandprocessionofcoalmine-hoistcableswasinvestigatedforthispaper.Withthespecialstructureofadetectiontransducer,theinterferingsignalfromtheleakagefieldofwiretwistscanbefilteredefficiently.Aftertheextractionofdimensionalcontractionandcharacteristicvaluesofmulti-wayssignals,aquantitativeBPneuralnetworkrecognitionforbrokenwiresinsteelcableswasrealized.Thetestresultsarepresented.
2BasicStructuralPrincipleoftheOn-LineDetectionInstrumentforCoalMine-HoistCable
Thestructuralprincipleoftheon-linedetectiondeviceforwirecablesstudiedbyusisshowninFig.1.Thedetectiontransduceriscomposedoftwosemicirclecylindricalstructureswhichcanbeopenedorclosed.Themagneticsensingunitisafluxgateunitmadeofasinglemagneticcoreandissingle-winding.Somemagneticsensingunitsareevenlyarrangedaroundtheinnerwallofthetransducer,thenumberofwhichistwiceasmanyasthenumberofthewirestrandsintheinspectedcable.Aswell,twoneighboringunitsareconnectedinseriestoadetectionchannel.Consequently,thenumberofdetectionchannelsofthedetectioninstrumentisequaltothenumberofwirestrandsinthecable.
Fig.1Structuralprincipleofdetectioninstrument
forbrokenwiresincoalmine-hoistcables.
Afterbeingfilteredandreshaped,thedetectionsignalfromeachchannelissenttothesignalprocessingunit.Theanalogdetectionsignalisconvertedintoadiscretedimensionalsequenceofsamplingvaluesbymulti-channelA/Dconversion,followedbyacharacteristicextraction,aBPneuralnetworkrecognitionandtheoutputoftheresult.Whenviewedseparately,theleakagefieldsignaldetectedbyeachsinglefluxgateunitistheleakagefieldintensityinthesteelcablewherethecorrespondingfluxgateunitsarelocated.Thatis,theoutputsignalZjkofanyjthtestunitis:
WhereFCisthestructuralparameterofthefluxgate,thewidthofthedrivesquare-wave,sthesaturatedmagneto-conductivityrate,Bc,jthemagnetic
inductionintensityoftheleakagefieldproducedbybrokenwires,Br,jthemagneticinductionintensityoftheleakagefieldproducedbywirecabletwists,ZfjthesignalvalueofbrokenwiresandZr,jthevalueoftheinterferencesignalproducedbywirecabletwists.
After,FC,a,us,Fareassured,Fisaconstant.Afterthewirecablesaredeeplymagnetized,thenumericalvalueofsisverysmall.Asaresult,thevalueofc,jislargerandthereisnoneedtomagnifyandprocessthedetectionsignalagain.Whenthesensorisoperatingalongwirecablesataspecifiedspeed,thesignalsdetectedbyeachofthemagneticfluxgateunitscaneffectivelyshowthethree-dimensionaldistributionstatusofmagneticfluxleakage,generatedatthesurfaceofwirecables[2–4].
3FiltrationoftheWavelikeOscillationInterferenceSignalProducedbyCableWireTwists
Thesignalofbrokenwiresfromwirecablesobtainedbyasinglefluxgatedetectionunitofthetransducer(formula
(1))containsallkindsofinterferingsignals.TheeffectofthewavelikeoscillationmagneticfluxleakageBr,jduetothespecialstructureofthesteelcablesislargest,whichdirectlyaffectsthedetectionofbrokenordamagedwires,especiallyincoalmine-hoistcables.Weshouldconsiderthepossibilityoffilteringtheinterferencesignals.Informula
(1),theinterferencesignalr,jcausedbyawavelikeoscillationshowsupasperiodicvariation.Thiskindofwavelikeoscillationinterferencesignalcanberegardedapproximatelyasasinewave,asshowninFig.2.
Fig.2Wavelikeoscillationinterferencesignal
producedbythecabletwist
Overthelengthdirectionofwirecables,itsvariationperiodTisaLaylengthofcablewirestrands.Atthecircledirectionofthewirecable,itsvariationperiodisthereciprocalofthenumberofouterwirestrandsofthecirclelengthofthewirecable.Therefore,thewavelikeoscillationinterferencesignalofthejthdetectionchannelcanbeexpressedas:
j
WhereaistheDirectCurrentComponentofthewavelikeoscillationsignal,mtheAlternatingCurrentComponentmagnitudeofthewavelikeoscillartionsignal,Trepresentsthevalueofperiods,yisthepositionofthedetectionunit,startingfromtheinitialspot,jtheinitialphaseofthewavelikeoscillationsignal,Nthenumberofwirestrandsofthesteelcable,andisthenumberofdetectionunits.cObviouslywhenc,i.e.,whenthenumberofdetectionunitsdoublesthenumberofouterstrandsofthewirecable,thewavelikeoscillationsignalcontainedintheleakagemagneticfieldsignalinspectedbyanytwoneighboringdetectionunitsisinareversalphase.Therefore,whentheneighboringdetectionunitsalongtheinnerwallofthecylinderofthetransducerstructureareconnectedforwardintoatestchannelinseriestwobytwo,itisequivalenttoaddingthe(j+1)thtestchannelsignaltothejthtestchannelsignal.Thusthestrandpeakvalueofthewavelikeoscillationsignalcompensatesforthestrandvalueforthemoment.Thatis,atthismoment,theonlyremainingwavelikeoscillationsignalistheDirectCurrentComponen
Atthismoment,themagneticfieldsignalofleakagefromanyoftheinspectionchannelsmadeupofthefluxgatearrayshouldbe:
ofthisformulacanbeeliminatedwhenthezerodetectionpositionisadjusted.Therefore,weconsideredthatthewavelikeoscillationinterferencesignalofcablewiresisfilteredbyformula(4).Afterthispretreatment,eachleakagefrombrokenwires,shownbymagneticfieldsignalsfromthetransducer,becomesachannelsamplevaluebyA/Dconversion,asshowninFig.3.
Fig.3Multi-channelsamplingvalueofbrokenwire
signalsfromwirecables
4ExtractionofCharacteristicValueofSignalsfromBrokenWires
AsisshowninFig.3,theN-channelinspectionsignalsfromthetransducerbecomesitssamplingsequencebyA/Dconversion.IfthenumberofsamplesofthesignalsofbrokenwiresisK,thesequenceofbrokenwiresamplesignalsofthejthchannelcanbeexpressedasarowvectorwithKelements.
TheN-channelsignalsequencewillmakeupaN-dimensionalseriesvectorgroupofbrokenwiresignals:
Atthismoment,Zisacharacteristicmatrixofbrokenwiresanditcontainsalltheinformationonthestatusofthebrokenwires.NKGiventheanalysisofrepeatedexperiments,thewidthofthediffusedleakagefromthemagneticfieldonthesurfaceofwirecablescreatedbybrokenwiresisnotlargerthan20mm.Whenthespeedoftheinspectedwirecableis3m/sandthesamplingintervalis1.2mm,thenumberofsamplesKis16atmost.WhenthenumberofinspectionchannelsisN=4,Zshouldbea4×16matrix.IftheanalysisofthecharacteristicmatrixofbrokenordamagedwiresZweredirectlycarriedou
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