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[pt] Anliseoperacionaldeumtratoragrcolaemfunodapressointernadospneuseinclinaodalinhadetrao

[en] Operationalanalysisofafarmtractorasafunctionofthetireinternalpressureandinclinationoftractionline

[pt] Aimportnciadaagriculturabrasileiranocenriomundialestintimamenterelacionadacomaampliaodafronteiraagrcolaaolongodoterritrionacionalnasltimasdcadas.Esseprocessoocorreumedianteautilizaodenovastcnicas,processoseequipamentosquepermitiramaexpansodoscultivosparareasantesconsideradasimprprias.Otratoragrcolatevepapelfundamentalnosaltodaagriculturanacionalepodeserconsideradaaprincipalfontedepotncianocampo.Autilizaodetratoresnaproduoaprimoraaqualidadedoserviorealizadoegaranteaobtenodemaiorrendimentooperacionalemtodasasetapasdaproduo.Otratorumamquinacomplexa,compostadeumasriedemecanismoseelementosqueoperamconcomitantementeparagarantirafunobsicadeumtrator,ouseja,fornecerpotnciaparaaagricultura.Odesempenhodeumamquinaemtraoafetadopordiversasvariveiscomoapressointernadospneuseatransfernciadepeso.Destemodo,objetivousecomessetrabalhoavaliarosseguintesquesitos:InflunciadapressointernadospneusedainclinaodalinhadetraonosparmetrosoperacionaisenasvibraesmecnicasnabasedopostodeoperaoAlteraodapressointernadospneusemcondiodinmicadecorrentedatransfernciadepesoentreoeixodianteiroetraseiro.OstrabalhosforamexecutadosnocampusdaUniversidadeFederaldeViosa,noperododemaroaagostode2012.Oexperimentoconduzidoparadeterminarodesempenhoeavibraonopostodeoperaofoirealizadoempistadesolofirme,sendoostratamentosconstitudosdacombinaodetrs

Pesquisaresultouem:1registro(s)Pginas:

Primeira|1|ltimaResultado(s)[11]TotaldePginas:1

1Autor: MarconiRibeiroFurtadoJnior

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pressesinternasdospneus(12,14e16psi),trsinclinaesdalinhadetraoequatroforasdetrao(3,576,8612,46e16,23kN),nodelineamentointeiramentecasualizado,comoitorepeties.Oexperimentoconduzidoparaavaliaravariaodapressointernadospneusemcondiodinmicafoirealizadoempistadeconcreto,comquatrotratamentosconstitudosdasforasdetraode4,4414,5718,6e23,92kN,nodelineamentointeiramentecasualizado,comquatrorepeties.Foiutilizadoumtratoragrcolacomtraodianteiraauxiliar,equipadocompneusdiagonaiseumconjuntodetransdutoresparamensurarosparmetrosdeinteresse.Osresultadosdemonstraramqueodeslizamentodosrodadosdotratoraumentouprogressivamentecomoaumentodaforadetrao,queareduodapressointernadospneuspromoveuareduododeslizamentodosrodadosnasmaioresforasdetraoequeainclinaodalinhadetraoapresentouefeitosignificativoapenasparaaforadetraode16,23kN.Oconsumohorriodecombustvelaumentoucercade65%comoaumentodaforadetraode3,56para16,23kN,apressointernadospneuseaclassedeinclinaodalinhadetraoapresentaramefeitoreduzidosobreessavarivel.Aforadetraoeapressointernadospneusexerceramefeitopositivonosnveisdevibraolongitudinalnabasedopostodeoperao,sendoqueosmaioresnveisforamobservadosparaacombinaoentreaforadetraode16,23kNeapressointernade110,32kPa,comvaloresprximosa0,61ms2,easmenoresparaaforade3,56kNepressode82,74kPa,comvaloresprximosa0,20ms2.Aforadetraoeapressointernadospneusapresentaramefeitoquadrticonosnveisdevibraonosentidoverticalnabasedopostodeoperao,sendoosmaioresnveisobservadosparaacombinaoentreaforadetraode16,23kNeapressointernade110,32kPa,comvaloresprximosa0,75ms2,easmenoresparaaforade3,56kNcombinadacomapressointernadospneusde82,74kPa.Avariaodatransfernciadepesoatuandosobrecadaeixodotratorfoicapazdepropiciaraalteraodapressointernadospneusemcondiodinmica.Aforadetraoapresentouefeitolinearnavariaodapressointernadospneusduranteodesenvolvimentodetrao,sendoomodelogeradoconsideradovlidoparaestimaraforadetraoapartirdavariaodapressointernadospneus.

[en] TheimportanceofBrazilianagricultureintheglobalscenarioiscloselyrelatedtotheexpansionoftheagriculturalfrontierthroughoutthecountryinrecentdecades.Thisprocessoccurredthroughtheuseofnewtechniques,processesandequipmentthatallowedtheexpansionofcropsforareaspreviouslyconsideredunsuitable.Thetractorhadaninstrumentalroleinjumpnationalagricultureandcanbeconsideredthemainsourceofpowerinthefield.Theuseoftractors

inproductionenhancesthequalityofserviceperformedandensuresachievinggreateroperationalefficiencyatallstagesofproduction.Thetractorisacomplexmachine,comprisinganumberofelementsandmechanismswhichoperateconcurrentlytoensurebasicfunctionofatractor,inotherwords,providepowerforagriculture.Theperformanceofamachineintractionisaffectedbyseveralvariablessuchastheinternalpressureofthetiresandweighttransfer.Thus,theaimofthisworkwastoevaluatethefollowingquestions:InfluenceoftheinternalpressureofthetiresandtheslopeofthelinetractioninoperatingparametersandthemechanicalvibrationofthebasestationoperationChangeintheinternalpressureofthetiredynamicconditionduetotheweighttransferbetweenfrontandrearaxle.WorkwasdoneonthecampusoftheFederalUniversityofViosa,intheperiodfromMarchtoAugust2012.Theexperimentconductedtodeterminetheperformanceandvibrationinthepostofoperationwasperformedinfirmgroundtrack,andthetreatmentsofthecombinationofthreetireinflationpressure(12,14and16psi),threeinclinationsoftractionlineandfourtractionforces(3.57,6.86,12.46and16.23kN),inacompletelyrandomizeddesign,witheightreplications.Theexperimentconductedtoevaluatethevariationoftheinternalpressureofthetiresindynamicconditionwasperformedonconcretetrack,withfourtreatmentsconsistingoftractionforcesof4.44,14.57,18.6and23.92kN,inacompletelyrandomizeddesign,withfourreplications.Weusedatractorwithfrontwheelassist,equippedwithbiastiresandasetoftransducersformeasuringtheparametersofinterest.Theresultsshowedthattheslipofwheelsetsofthetractorincreasedprogressivelywithincreasingtractionforce,thatreducingtheinternalpressureofthetirescausedareductionintheslipofthewheelsetsinthegreatesttractionforcesandthattheinclinationofthelinetractionhadsignificanteffectonlyforthetensilestrengthof16.23kN.Thehourlyfuelconsumptionincreasedbyabout65%withincreasingtensilestrengthof3.56to16.23kN,theinternalpressureofthetiresandtheclassofinclinationofthelinetractionhadlimitedeffectonthisvariable.Thetractionforceandtheinternalpressureofthetireexertedapositiveeffectonlevelsoflongitudinalvibrationatthebaseofthepostoperating,thehighestlevelswereobservedforthecombinationoftensilestrengthof16.23kNandtheinternalpressureof110,32kPa,withvaluescloseto0,61ms2,andthelowestfortheforceof3,56kNand82,74kPapressure,withvaluescloseto0,20ms2.Thetractionforceandtheinternalpressureofthetireshadaquadraticeffectonvibrationlevelsintheverticaldirectionatthebaseofthepostoperating,thehighestlevelswereobservedforthecombinationoftractionforceof16,23kNandtheinternalpressureof110,32kPa,withvaluescloseto0.75ms2,andthe

lowestfortheforceof3,56kNcombinedwiththeinternalpressureofthetiresof82,74kPa.Thevariationofweighttransferactingoneachaxleofthetractorwasabletoprovidethechangeintheinternalpressureoftiresindynamiccondition.Thetractionforceshowedalinearvariationoftheinternalpressureofthetireduringthedevelopmentoftensile,beinggeneratedmodelconsideredvalidtoestimatethetractionforcefromthevariationoftheinternalpressureofthetires.

[Orientador] HaroldoCarlosFernandes[MembrodaBanca] RenatoAdrianeAlvesRuas[CoOrientador] PauloRobertoCecon[CoOrientador] FbioLcioSantos

[pt] Mquinasagrcolas[pt] Foradetrao[pt] Pneus[pt] Vibrao[en] Agriculturalmachinery[en] Tractionforce[en] Tires[en] Vibration[pt] ENGENHARIAAGRICOLA

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Titulao: MestreemEngenhariaAgrcola

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Datadadefesa: 18/02/2013

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Email: marconi.furtado@gmail.com

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