外文翻译范文 5.docx
- 文档编号:6291966
- 上传时间:2023-01-05
- 格式:DOCX
- 页数:15
- 大小:222.20KB
外文翻译范文 5.docx
《外文翻译范文 5.docx》由会员分享,可在线阅读,更多相关《外文翻译范文 5.docx(15页珍藏版)》请在冰豆网上搜索。
外文翻译范文5
本科毕业设计(论文)
外文参考文献译文及原文
学院机械工程学院
专业机械设计制造及其自动化
年级班别2010级
(2)班
学号1045522208
学生姓名丁瑞
指导教师田桂中
2014年5月1日
目录
外文参考文献原文
1.INTRODUCTION3
2.OUTLINEOFSAFETYSYSTEM3
3.SIMULATIONMODEL4
4.EXPERIMENTS6
5.CONCLUSION6
电梯安全系统模拟器的设计和评价电梯安全系统7
1.引言7
2.外形安全系统8
3.仿真模型9
4.实验12
5.仿真模型13
ASimulatorfortheDesignandEvaluation
ofElevatorSafetySystems
ABSTRACT
Wedevelopedasimulatortoevaluatethesafetyofelevator.Thissimulatorincludesadynamicmodelwithanormalstateandsomeabnormalstatesandasafetylogicmodel.Thesemodelsaredescribedwithastatetransitionmodel.Thisreportoutlinesthissimulator,andweshowitseffectivenessbycomparingthesimulator'sresultswithexperimentalresults.
KEYWORDSSafetySystem,Elevator,Simulator,StateTransitionModel
1.INTRODUCTION
Wedevelopedasimulatortoevaluatesafetyofanelevator.Therearesomesimulatorswhich
simulatethedynamicsofanelevator[1][2].Thesehaveamodelthatshowswhentheelevatorisnormalorhasaspecificerror.Therearenosimulatorswhichcansimulatethestatetransitionofanelevator.Atransitionofthedynamiccharacteristicsofanelevatoraccordingtotheoperationofthesafetylogichasahighlevelofinfluenceintermsofelevatorsafety.Toaccuratelyevaluatesafetyofanelevator,weneedasimulatorthatcancontinuouslyandpreciselysimulatethestatetransitionsofarunningelevator.Therefore,wedevelopeda
simulatorthatcombinesasafetylogicsimulationmodelandadynamicsimulationmodel,which
expressestheconsecutivetransitionsofstatesoftheelevator.Usingthissimulatorallowedusto
preciselyexpressthecontinuoustransitionsofanelevator
Thissimulatoriscomposedbythefollowingstatetransitionmodels.
(1)Dynamic
simulates
simulationmodel:
thispreciselythecontinuoustransitionsofarunningelevator'sstate.
(2)Safetylogicsimulationmodel:
thissimulatessafetylogicoperationsaccordingtothecontinuoustransitionsofanelevator'sstate.
Bytheintegrationofthedynamicsimulationmodel
(1)andthesafetylogicsimulation
model
(2),weachievedtheevaluationoftheelevator'ssafety.
Inthispaper,weexplainthisnewsimulatorandshowitseffectivenessbycomparingitsresultswiththoseofexperiments.
2.OUTLINEOFSAFETYSYSTEM
EVALUATIONSIMULATOR
Figure3showstheoutlineofanelevatorsystem.Anelevatoriscomposedofamotor,a
safetygear,abrake,asheave,tractionropes,acar,acounter-weight,andsoon.Amotorgeneratesthetorquetodrive.Asafetygearisabrakingdevicewhichstopsacarintheemergency,andabrakeisabrakingdevicewhichstopsamotorintheemergency.Asheavetransmitsthetorqueofamotortotractionropes.Tractionropesconnectacarandacounter-weight.Passengersgetonacar.Acounter-weightisaweighttotakebalancewithacar.Anelevatoroperatesaccordingtothecombinationofthesecomponents.
Safetyofanelevatorissecuredbythemovementofthebrakingdevicesinthe
emergency.Thestatetransitionofbrakingdevicesinfluencessafetyofanelevator.Itisnecessarytostructureasimulatorthatcanevaluatetheinfluenceofastatetransitionofacertaincomponentonthewholesystem.
Figure1showstheoutlineofthisnewsimulator.Thesimulatoriscomposedofadynamicsimulationmodelandasafetylogicsimulationmodel.Thestatetransitionsinthedynamicsimulationmodelandthesafetylogicsimulationmodelaredescribedasstatetransitionmodels.Astatetransitionmodelisasimulationmodelthatusesastatetransitiondiagram.Figure2showsanoutlineofastatetransitiondiagram.Inastatetransitiondiagram,therearestatemodelsthatshowdifferentstates,andconditionsthatchangestatesaredescribedineachstatemodel.In'thesimulator,thecomponentswhichshownormalstatesandabnormalstatesofanelevatoraredescribedbyusingstatetransitionmodels.Foranexample,anormalstateofabrakeisastateofstandingby,andanabnormalstateisastateofbeingoperated.
Bycouplingeachstatetransitionofacomponent,theinfluencethatacontinuoustransitionineachcomponentgivestoawholesystemisappreciable.
InFigureI,componentsA,B,andC,arecomponentsofanelevator.Theyareatractionmachine,acar,ropes,sheaves,agovernor,andsoon.Equationsofanelevator'smotionareformedbycouplingoftheeachcomponent'smotion.Wemodeledthedynamiccharacteristicsforeachcomponentwhichshownormalstateandsomeabnormalstate,andtheyformtheconditionsforthestatetransitions.Thestateofeachcomponentischangedwhenthestatetransitionconditionsaremet.
Inthesafetylogicsimulationmodel,wedescribedsafetydevicesasstatetransitionmodels,too.Wemodeledeachsafetydevicewhichshowsthestateofwatchinganabnormalstateandtheoperatingstateafteranabnormalstateisdetected.Themodelsofsafetydevicesformtheconditionsforthestatetransitions.Thetransitionconditionsaresettocorrespondtotheoperationconditionofeachsafetydevice.Themodelsofsafetydevicesoutputinstructionstooperatethebrakingdevices,whenthestateofthesafetydeviceschanges.
ThenextparagraphdetailsthemodelingofadynamicsimulationmodelandasafetylogicsimulationmodelfortheelevatorshowninFigure3.Anelevatoriscomposedofamechanicalsystemandanelectricalsystem.Thedynamicsimulationmodelofthemechanicalsystemiscomposedofthedynamiccharacteristicsoftheropes,andsoon.Thedynamicsimulationmodeloftheelectricalsystemconsistsofthemotorcharacteristics,andsoon.Safetylogicsimulationmodeliscomposedofsomesafetyalgorisms.
3.SIMULATIONMODEL
A.Dynamicsimulationmodel
(1)Modelingofthemechanicalsystem
Figure4showsthedynamicmodelofanelevator'smechanicalsysteminthenormalstate.Equationsofthemotionsofeachcomponent,whichshowthenormalstateandabnormalstates,canbechangedaccordingtothestatetransitionsofeachcomponent.Asaresult,wecanpreciselysimulatethecontinuoustransitionsofthemechanicalsystem'sdynamiccharacteristics.
Asafirstexample,weexplainthemodelingofthestatetransitionoftractionbetweenthetractionropeandthesheave.
ThestructureshowninFigure4changeswhenslippingoccursbetweenthetractionropeandthesheave.Theconditioninwhichtheropedoesn'tslipcanbeexpressedbyequation
(1):
whereFsisfrictionalforcebetweenthesheaveandtherope,}isacoefficientoffriction,Bistheangleoftherope'swrap,T,and几areintheportionoftheropesituatedatthesheave,andI'
istheeitherlimitforcessideofofthetraction'sability.[3]
Whenequation
(1)doesn'thold,slippingoccursbetweenthesheaveandtherope.Inturn,FS,whichisshowninthenextequation,occurs.FSinfluencesthebehaviorofthecar,sothe
dynamiccharacteristicsoftheropearemodeledtoaccuratelyevaluatethetension.Inthesimulator,slippingisobservedbyusingequation
(2),inwhichtensionisderivedbytheexpansion1en多hoftheropesituatedateithersideofthe
sheave.Whenropeslippingdoesnotoccur,themodelassumesthattheropemovesinunisonwiththesheave.Whenropeslippingoccurs,themodelshowstheropeandthesheaveasseparated,and
thefrictionalforcemutuallyshowninequation
(2)isputintoeffect.Theslippingstate'scontinuoustransitionismodeledbyassumingtheconditionoftheropeandthesheaveimmediatelybeforeropeslippingoccurs,aswitheachinitialconditionoftheropeandthesheaveintheslippingmodel.
Thesecondexampleshowsthemodelingofthestatetransitionwhenthetractionropeisbroken.Theropeismodeledbyconnectingthespringcharacteristicsandcertainmasses,asshowninFigure5.Also,thebrokenropeismodeledusingthelackofspringcharacteristicsthatconnectthetwomasses.Asanexample,atthetimetheropebreaks,whichisshowninFigure5,thetackofthesespringcharacteristicsisembodiedbyswitchingthefollowingequationsofmotionsofm;andm,_,.[Beforetheropebreaks]
Inthissimulator,thedynamicalcharacteristicsofbrakingdevices,suchasasafetygearanda
brake,arealsomodeled.Thismeanswecanunderstandtheinfluenceofbrakingdevice
delaysandchangesintheabilityofbrakingdevicesaccordingtotime.
(2)Modelingoftheelectricalsystem
Thedrivecircuitofthemotorandthecontrolcircuitofthecontrollerareillustratedonthe
simulatorinthecircuitblockchart.Onesafetydeviceblockscurrentsupplytothemotorwhen
theemergencystoppingcircuitisbrokenandthecontrolofthemotorstopsaswell.Inthiscase,
thestatechangeisexpressedinthesimulatorusingblockseparation.Moreover,theabnormal
statesofthemotorandthecontrolleraremodeledinthesimulationtobecontinuouslyswitched.
Inthesimulator,componentoftheelectricalsystemisthestatetransitionmechanicalmodeledbysystemofeachandtheusingastatetransitionchart.Figure6showsanoutlineofthis.B.Safetylogicsimulationmodel
Inthissection,weexplainthesafetylogicmodelofthe"SmoothEmergencyTerminalSlowdown(SETS)"systemasanexample.
TheSETSsystemisanelectronicsafetydeviceappliedforelevators.Applyingelectronictechnologytothesafetydeviceforanelevatorhasbecomepossiblewiththedevelopmentofthistechnologyinrecentyears.Becausethecurrentsafetydevicesofelevatorsarebuiltwithmechanicaldevices,theyarenotabletounifyacomplexsafetyalgorithm.However,suchacomplexsafetyalgorithmcanbeachievedbyapplyingelectronictechnologytothesafetydeviceofanelevator
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 外文翻译范文 外文 翻译 范文
![提示](https://static.bdocx.com/images/bang_tan.gif)