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本科毕业设计(论文)外文翻译译文题目:使用智能液压缸增加起重机的稳定性学院:机电学院专业:机械设计制造及其自动化学生姓名:XXX学号:1234567890指导教师:XXX完成时间:2017年3月12日2From:Hitchcox,Alan.Smartcylindersstabilizecranes[J].Hydraulics&Pneumatics;Cleveland(Sep12,2013):n/a.SmartcylindersstabilizecranesHitchcox,Alan.ASMInternational,PentonMedia,OTPIndustrialSolutions(formerlyOhioTransmission&PumpCo)Abstract:It'snotunusualforcranestoreach100ftormoreintotheairatmajorconstructionsites.Traditionally,cranesaretransportedtoaworkareaandassembledon-site.Morerecently,astruck-mountedcranesbecomebiggerandmorepowerful,theyhavefoundfavorbecausetheyarequickertosetupthantraditionalcranes.Truck-mountedcraneshaveatelescopinghydraulicboommountedoncommercialtruckchassis.Theirportabilityandlowersetupcostshaveledtotheirwidespreaduseatconstructionandutilitysitesaroundtheworld.Butasloadsgetheavierandliftingdistancesbecomehigher,designersoftruck-mountedcranesmustprovidethestabilitytoensurethatsafetyremainsthetoppriority.Truck-mountedcranesuseoutriggersystemstoensurestableoperation.Theoutriggersextendfromthemainbodyofthetruckandcontactthegroundseveralfeetawayfromthetruck.Thisdistributesthecrane'sloadoveramuchlargerarea,therebyincreasingstability.ManitowocCompanyInc.,Manitowoc,Wis.,takesthisastepfurtherbyusingsmartcylindersintheA-frameoutriggersystemsofitsNationalCranelineoftruck-mountedcranes.Thecrane'shydraulicsystemisdrivenfromapowertakeoffonthetruck'stransmission.Thecraneoperatorthenrunsallcranefunctionsthroughaseriesoflever-operatedvalvesatacontrolstation.TheELAisanexternallymountedLDTthatusesHall-effecttechnologytosensethelocationofamagnetembeddedinthecylinder'spistonthroughthecylinder'scarbonsteelbarrel.Amicroprocessorthenassignsananalogvoltagetothemagnet'scorrespondingabsoluteposition.Forexample,whenthecylinderisfullyretracted;thevoltagemaybe0.55V.Asthecylinderextends,thevoltagegraduallyincreasesuntil4.5Visreachedatfullextension.3Accuracyofthetransduceristypically+-0.5mm(0.02in.)-morethanadequateformostmobileequipment.ThatpositionisthensenttotheECMandcomparedtotheknownmaximumhorizontalextension.Afterthis,anindicationisgiventotheoperatorabouttheoutriggerstate.Thepositionupdatehappenswithinmilliseconds.FullTextIt'snotunusualforcranestoreach100ftormoreintotheairatmajorconstructionsites.Traditionally,cranesaretransportedtoaworkareaandassembledon-site.Morerecently,astruck-mountedcranesbecomebiggerandmorepowerful,theyhavefoundfavorbecausetheyarequickertosetupthantraditionalcranes.Truck-mountedcraneshaveatelescopinghydraulicboommountedoncommercialtruckchassis.Theirportabilityandlowersetupcostshaveledtotheirwidespreaduseatconstructionandutilitysitesaroundtheworld.Butasloadsgetheavierandliftingdistancesbecomehigher,designersoftruck-mountedcranesmustprovidethestabilitytoensurethatsafetyremainsthetoppriority.Truck-mountedcranesuseoutriggersystemstoensurestableoperation.Theoutriggersextendfromthemainbodyofthetruckandcontactthegroundseveralfeetawayfromthetruck.Thisdistributesthecrane'sloadoveramuchlargerarea,therebyincreasingstability.ManitowocCompanyInc.,Manitowoc,Wis.,takesthisastepfurtherbyusingsmartcylindersintheA-frameoutriggersystemsofitsNationalCranelineoftruck-mountedcranes.Thecrane'shydraulicsystemisdrivenfromapowertakeoffonthetruck'stransmission.Thecraneoperatorthenrunsallcranefunctionsthroughaseriesoflever-operatedvalvesatacontrolstation.Animportantfunctionforlifting,moving,andloweringheavyloadsistoensurethatoutriggerbeamsareproperlypositioned.TheoutriggersareattachedtothetruckframeandareextendeddownwardbyhydrauliccylindersatanangletocreateanA-framestructurethatiswideratitsbasethanatthetop.Thisprovidesastableframeworktolevelandsupporttheloadedandextendedcrane.AddingsmartstooutriggersForthepastseveralyears,NationalCranehasaddedoutrigger-monitoringsystems(OMSs)toitscranes.WiththeOMS,operatorsmonitorthehorizontalextensionofthecrane'soutriggersatacontrolstation.TheOMSusedwithA-framemodelcranesincludesanELA4position-sensinglinear-displacementtransducer(LDT)fromRotaEngineering,Dallas,anelectroniccontrolmodule(ECM),andbicolorindicationLEDsateachstation.TheELAisanexternallymountedLDTthatusesHall-effecttechnologytosensethelocationofamagnetembeddedinthecylinder'spistonthroughthecylinder'scarbonsteelbarrel.Amicroprocessorthenassignsananalogvoltagetothemagnet'scorrespondingabsoluteposition.Forexample,whenthecylinderisfullyretracted;thevoltagemaybe0.55V.Asthecylinderextends,thevoltagegraduallyincreasesuntil4.5Visreachedatfullextension.Accuracyofthetransduceristypically+-0.5mm(0.02in.)-morethanadequateformostmobileequipment.ThatpositionisthensenttotheECMandcomparedtotheknownmaximumhorizontalextension.Afterthis,anindicationisgiventotheoperatorabouttheoutriggerstate.Thepositionupdatehappenswithinmilliseconds.MarkHoffman,ofRotaEngineering,pointedoutthatbecausemobileequipmenthasahumanoperator,positionfeedbackfromcylindersgenerallyonlyneedstobewithinhundredthsofaninch.Putsimply,hesaysthatmagnetostrictiveLDTsareoverkillformostmobile-equipmentapplications.HesuggeststhatanLDTwithslightlylessprecision,butsubstantiallylowe
本文标题:汽车起重机毕业设计外文翻译
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