欢迎来到人人文库网! | 帮助中心 人人文档renrendoc.com美如初恋!
人人文库网
全部分类
  • 图纸下载>
  • 教育资料>
  • 专业文献>
  • 应用文书>
  • 行业资料>
  • 生活休闲>
  • 办公材料>
  • 毕业设计>
  • ImageVerifierCode 换一换
    首页 人人文库网 > 资源分类 > PDF文档下载  

    外文翻译--盾构机的压力调节液压推力系统的仿真分析 英文版.pdf

    • 资源ID:97524       资源大小:276.56KB        全文页数:6页
    • 资源格式: PDF        下载积分:5积分
    扫码快捷下载 游客一键下载
    会员登录下载
    微信登录下载
    三方登录下载: 微信开放平台登录 支付宝登录   QQ登录   微博登录  
    二维码
    微信扫一扫登录

    手机扫码下载

    请使用微信 或支付宝 扫码支付

    • 扫码支付后即可登录下载文档,同时代表您同意《人人文库网用户协议》

    • 扫码过程中请勿刷新、关闭本页面,否则会导致文档资源下载失败

    • 支付成功后,可再次使用当前微信或支付宝扫码免费下载本资源,无需再次付费

    账号:
    密码:
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源(1积分=1元)下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    外文翻译--盾构机的压力调节液压推力系统的仿真分析 英文版.pdf

    RESEARCHARTICLEZhibinLIU,HaiboXIE,HuayongYANGSimulationanalysisofpressureregulationofhydraulicthrustsystemonashieldtunnelingmachine©HigherEducationPressandSpringer-VerlagBerlinHeidelberg2011AbstractHydraulicthrustsystemisanimportantsysteminashieldtunnelingmachine.Pressureregulationofthrustcylindersisthemostimportantfunctionforthrustsystemduringtunnelexcavation.Inthispaper,ahydraulicthrustsystemisexplained,andacorrespondingsimulationmodeliscarriedoutinordertostudythesystemcharacteristics.Pressureregulationofacertaingroupscylindershaslittleinuenceonregulationoftheothergroupscylinders.Theinuencewillnotaffecttheprocessmuchduringtunnelexcavation.Pumpdisplacementmayhaveagreatereffectonpressureregulationandoilsupplyowrateshouldbeadaptivetothesystemsdemand.Aexactingsituationissimulatedtoexplainhowpressureregulationworksduringtunnelexcavation.Keywordstunnel,hydraulicthrustsystem,pressureregulation,simulation1IntroductionAshieldtunnelmachineisalargeandcomplexmachineusedinundergroundtunnelexcavation.Itisusedinconstructionprojectssuchasundergroundraillines,urbanpipelines,submarinetunnels,andsoon.Hydraulictechniqueiswidelyappliedinashieldtunnelingmachine.Forinstance,itisusedinthethrustsystem,thecutterheaddrivesystem,thescrewconveyor,andthesegmenterector.Researchworksabouttunnelexcavationhavebeencarriedout.SugimotoandSramoonbuiltatheoreticalmodelfortunnelexcavationbasedonmechanicsanalysis1;theirsimulationresultsareingoodagreementwithobserveddata2.MaynarandRodriguezusedadiscretenumericalmodeltoanalyzetheexcavationprocess.Somestudiesaboutthrustforceandtorquewerealsocarriedout3.Xuetal.havediscoveredsomerelationshipbetweenworkingparametersduringtunnelexcavation4.Onlyafewstudiesaboutthehydraulicsystemonthemachinehavebeendone.Huetal.havedonesomeworkonathrustsystemofamachine.Pressureandowcompoundcontrolhavealsobeenresearched5.AdifferentsysteminRef.5isstudiedinthisresearch.Pressureregulationofthrustsystemisstudiedbyusingasimpliedsimulationmodelandcasesofsuchregulationarediscussed.2ThrustsystemAthrustsystemisanimportantpartofashieldtunnelingmachine.Thesystemconsistsofpowerunits(electricmotorandhydraulicpump),hydraulicvalves,andhydrauliccylindersasactuators.Thenumberofthrusthydrauliccylindersisusually16or32.Ifindividualcontrolofhydrauliccylindersisapplied,ahighnumberofproportionalcontrolvalvesandpressuresensorsarerequired.Moreover,themachineoperatorhastocontrol16or32pressureparametersduringexcavation.Individualcontrolisrathercomplicatedandexpensive.Nowadays,thrustcylindersareusuallydividedintofourorvegroups,withthefour-grouparrangementmorecommon.Four-groupcylindersaredividedintoGroupA,GroupB,GroupC,andGroupD,correspondingtorightzone,lowerzone,leftzoneandupperzone.TheproportionofABCDisusually4543,asshowninFig.1.MorecylindersarerequiredinGroupBsoastocountertheweightofcutterheadandthehigherearthpressureinthelowerzone.Oilpressuresindifferentcylindersarethesameiftheyareinthesamegroup.Inthiscase,onlyfourproportionalcontrolvalvesarerequired,andthemachineoperatoronlyhastocontrolfourpressureparameters.Duringtunnelexcavation,hydrauliccylindersaresuppliedwithhigh-pressurehydraulicoil,whichexertsonthesegmentstogenerateathrustforcetopushthemachineReceivedJanuary28,2011;acceptedJune10,2011ZhibinLIU,HaiboXIE(),HuayongYANGStateKeyLaboratoryofFluidPowerTransmissionandControl,ZhejiangUniversity,Hangzhou310027,ChinaE-mail:hbxiezju.edu.cnFront.Mech.Eng.2011,6(3):377382DOI10.1007/s11465-011-0226-yforward.Themachineoperatormayadjusthydraulicpressuresofthrustcylinderstoachievesteeringcontrolandmachinepostureadjustment.Afterathrustprocessisover,segmentswillbeinstalledtocomposeanewringoftunnel.Meanwhile,thrustcylindersareretractedinordertomakeroomforthosesegments.Whenasegmentislocated,correspondingcylindersareextendedout.Thesecylindersexertonthesegment,supportingthesegmentwithasmallforcetocompletetheinstallationprocess.3HydrauliccircuitandmodelingThehydrauliccircuitdiagramforthethrustsystemisshowninFig.2.Thesystemmainlyconsistsofavariabledisplacementpump1,apressurereliefvalve2,adirectionalcontrolvalve3,fourpressurereducingvalves4andsixteenhydrauliccylinders7.Pumpdisplacementisproportionaltotheinputsignal.Apressurereliefvalvekicksintoactionwhenthesystemisoverloaded,andadirectionalcontrolvalveisusedtocontroltheextensionmotionorretractionmotionofcylinders.Thepressurereducingvalveisthemostimportantcomponentandisusedtoadjustthehydraulicpressureofthecylinders.Whenthecylinderisextending,high-pressureoilcomesfromhydraulicpump1,andthenowsthroughdirectionalcontrolvalve3,pressurereducingvalve4,checkvalve5,on/offvalve6,nallyenteringtherearchamberofhydrauliccylinder7.Thebackpressureoilowsoutoftherodchamberofcylinder7,thenthroughdirectionalcontrolvalve3andbackintotheoiltank.Whenthecylinderisretracting,oilowsthroughdirectionalcontrolvalve3,thenintotherodchamberofhydrauliccylinder7.Thebackpressureoilowoutoftherearchamber,thenthroughon/offvalve6,checkvalve8,directionalcontrolvalve3,andnallyintotheoiltank.CommercialsoftwareAMESimisusedastheanalysistoolforthesimulation.Tosimplifythemodel,twogroupsofhydrauliccylinders(typicallyleftzoneandrightzone)areconsideredforanalysis.Byusingthesetwozones,itispossibletosimulatethesteeringmotionoftheshieldmachine.ThesimulationmodelisshownasFig.3.Allthehydraulicmodelsarethenormalmodelsprovidedbythesoftwareexceptforthepressurereducingvalves.Thevalveisbuiltasa“super-component”bycompositingseveralnormalmodels.Thevalvegivesmoredetailsaboutnotonlytheworkingparametersbutalsotheinternalstructures.Avariabledisplacementpumpisappliedasproportionaldisplacementcontrolpumpasithasthesamefunctionasthatonaworkingshieldmachine.Thepumpdisplacementisproportionaltotheinputsignal.Threekindsofforcesareconsideredinthecylinderloadmodel:earthpressureforce,friction,andtheforcecausedbythethrustmotion.Earthpressureexertsonthecutterheadandliningsofthemachine.Thepressureforceexertedonthecutterheadaffectsthethrustmotion,andthepressureforceontheliningcanbeignored.Thefrictionforceonliningsofthemachinecausedbytheearthpressureisconsiderable,accountingforabouthalformoreofthethrustforce.Duringexcavation,however,thepressureforceandfrictionforcealmostmaintaincon-stantly.Thus,thesetwoforcesaresetasconstantinthemodel.Earthpressureissetbytheinputsignaloftheloadmodel,andfrictionissetinthemassmodelofcylinder.Thereisalinearrelationshipbetweenadvancingspeedandthrustforce,asshowninFig.44.Theblackstardotsrepresenttheexperimentalresultsfora68%openratiocutterhead,andthewhitesquaredotsrepresenttheresultsfor36%openratio.Eachsolidlineshowsthelinearrelationshipbetweenadvancingspeedandthrustforce.ThelinearrelationshiphasagoodagreementwiththeobserveddatainconstructionofLineNo.3intheGuangzhouMetro6.Fig.1Arrangementof4-grouphydrauliccylindersFig.2Hydrauliccircuitofthrustsystem378Front.Mech.Eng.2011,6(3):377382Agreaterthrustforcecausesahigheradvancingspeed.Thatisbecausegreaterforceinducesagreaterfeedrateofcutters,andmoresoilwillbecutoffinaxedtimeinterval.Thethrustforceshouldbegreaterthanearthpressureexertedonthecutterheadtogetherwithfrictionforceonthelining,inordertopushthemachinetoadvance.Ifthrustforceisnotgreatenough,themachinewillnotadvance.InFig.3,thereisadeadbandintheloadmodel.Thedeadbandrepresentsthesituationinwhichthrustforceisnotgreatenoughtopushthemachineforward;suchasituationisreferredtoinRef.6.Whilethemachineisadvancing,anincreaseofthethrustforcewillcauseanincreaseofadvancingspeed.Thisexperimentresultisappliedtotheloadmodel.Theorientationofmachineadvanceisinuencedbythepressuredistributionofthrustcylinderssopressureregulationdeterminestheprocessionofexcavation.Themachineoperatormaycontrolthepostureofthemachinebyadjustingthepressuresofcylindergroups.Themachinemaysteerleftorright,oradvancealongasmallangleofslopeifcorrespondingsettingsofpressureregulationaregiven.Normally,attheendofatunnelexcavation,thedifferencebetweenactualtunnelaxisanddesignedtunnelaxisshouldbenomorethan20mm.Themachineoperatorwilladjustthemachineadvancingaxistoagreewiththedesignedaxis.Asaresult,pressureregulationisaveryimportantfunctionduringtunnelexcavation.4SimulationThesimulationparametersshowninTable1areobtainedfromashieldtunnelingmachineusedintheconstructionoftheNanjingMetro.Theleftandrightthrustgroupsareusedforsimulation,andsixteenhydrauliccylindersarereducedtoeight.A63cc/revmaximumdisplacementpumpshouldbereducedto31.5cc/rev.Pistondiameterofarealcylinderis300mm,androddiameteris240mm.Eithertheleftorrightthrustgroup,eachofwhichcontainsfourhydrauliccylinders,issimpliedtoonehydrauliccylinder,whichhasthesameworkareaastheoriginalcylindergroup.Asaresult,thepistondiameterandroddiameterofsimulationcylinderare600and480mm,respectively.Whenoilpressureisabout8MPa,whichsuppliesabout9200kNofthrustforce,themachinebeginstomove.Reference7refersthatfrictionforceaccountsforabout53.5%73%ofthrustforce.Accordingly,frictionforceissetat6000kN,about65%ofthrustforce.Theremaining3200kNisexertedonthecutterheadfortunnelexcavation.4.1PressureregulationSteeringcontrolissimulatedinthiscase.Bothhydrauliccylindersareinitiallysettoabout14MPa.Themachineadvancesstraightandisexpectedtosteerleft.Thepressureofrightcylinder(Pright)shouldbehigherthanthatoftheleft(Pleft).Pleftmaymaintainat14MPa.Prightissetto20MPa.SimulationresultisshowninFigs.5and6.Prightisadjustedto20MPaasthestepsignalisgiven.ThereisasmallovershootofthepressureinFig.5asthereisamass-springsysteminthepilotstage.OvershootoftheFig.3SimulationmodelofthethrustsystemFig.4Thrustforceversusadvancingspeedinsoftground4Table1MainsimulationparametersItemSettingvaluePumpmaximumdisplacement30cc/revReliefpressure35.3MPaNominalpumpspeed1500revPistondiameterofcylinder600mmRoddiameterofcylinder480mmForceexertedoncutterhead3200kNFrictionforce6000kNZhibinLIUetal.Simulationanalysisofpressureregulationofhydraulicthrustsystem379mass-springsystemcausesovershootoftheoutletpressureinthemainstage.PlefthasapulsewhenPrightisadjustedandincreasesslightlyafteradjustment.Thesuddenchangeininletpressurewillcausethesamepulseinoutletpressureatrst.Becausethepilotstagefrequencyresponseisnothighenough,whenthepilotstagemechanismstartsadjustingthevalvesopeningarea,outletpressurewilldecreasetothesetvalue.ThesmallincreaseofPleftmightbecausedbytheincreaseofpumpoutletowrate.Thepumpoutletowratewillbediscussednext.Thissmalldifferenceinpressurewillnotaffectthetunnelexcavation.Higheradvancingspeedisachievedontherightside,asshowninFig.6.Aleftsteeringmotioniscarriedout.4.2PumpdisplacementadjustmentPumpdisplacementshouldbeadjustedwhenpressureregulationiscarriedout.Threecasesareilluminatedtoexplaintheproblem.Pressureregulationisoperatedasinthepreviouscase.Case1:Displacementmaintainsatabout75%ofmaximum.TheresultisshowninFig.7.Prightisadjustedto20MPa.Pressureregulationisachieved.However,pumpoutletpressureisat35.3MPa,whichmeansthesystemisoverloadedandthepressurereliefvalveopens.Powerlosscausedbyreliefowisconsiderable.Case2:Displacementmaintainsatabout50%ofmaximum.TheresultisshowninFig.8.Pumpoutletpressureissensitivetotheloadpressure.Thereisnooverloadduringpressureregulation.However,thrustpressurecannotbeadjustedto20MPabecauseoilowsupplyisnotenough.Higherthrustpressurecauseshigheradvancingspeed,whichmeansthecylinderrequiresmoreoilowrate.Pressureregulationisinvalidatedinthiscase.Case3:Displacementissetat50%atrst,then75%whenpressureregulationiscarriedout.TheresultisshowninFig.9.Thereisnooverload.Pumpoutletpressureissensitivetotheloadpressure.Thrustpressurecanbeadjustedto20MPa.Thisisbecausepumpdisplacementisadaptivetothesystem.Apressureregulationshouldbetogetherwithapumpdisplacementregulation.4.3AtoughsituationInpractice,anoptimaltunnelprojectisworkedoutafterconsideringcommutersneeds,commercialdemand,geologicalconditions,andsoon.Shieldtunnelingmachineisexpectedtoadvanceingoodgeologicalconditions.Normally,ageologicalsurveyisdonebeforetheexcava-tionprocess.Itisimpossible,however,toknoweverythingFig.5PressuresofrightandleftcylindersduringpressureregulationofleftsteeringFig.6DisplacementsofrightandleftcylindersduringpressureregulationofleftsteeringFig.7Pressuresofpumpoutletandrightcylinderwhenpumpdisplacementmaintainsat75%ofmaximumdisplacement380Front.Mech.Eng.2011,6(3):377382

    注意事项

    本文(外文翻译--盾构机的压力调节液压推力系统的仿真分析 英文版.pdf)为本站会员(上***)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网(点击联系客服),我们立即给予删除!

    温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    网站客服QQ:2881952447     

    copyright@ 2020-2025  renrendoc.com 人人文库版权所有   联系电话:400-852-1180

    备案号:蜀ICP备2022000484号-2       经营许可证: 川B2-20220663       公网安备川公网安备: 51019002004831号

    本站为文档C2C交易模式,即用户上传的文档直接被用户下载,本站只是中间服务平台,本站所有文档下载所得的收益归上传人(含作者)所有。人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。若文档所含内容侵犯了您的版权或隐私,请立即通知人人文库网,我们立即给予删除!