简介：山东理工大学硕士学位论文公共汽车制动能量再生的液压储能技术研究姓名任国军申请学位级别硕士专业载运工具运用工程指导教师曲金玉20060401山东理工大学硕士学位论文ABSTRACTABSTRACTINTKSPAPER，THEBRAKINGENERGYREGENERATIONSYSTEMOFCITYBUSISSTUDIED．BYUSINGTHEENERGYREGENERATIONTECHNOLOGY，THEKINETICENERGYGENERATEDDURINGBRAKINGISRECOVEREDANDTHENRELEASEDWHENTHEBUSSPEEDSUP．INTHISWAY，THECITYBUSCANREDUCEFUELCONSUMPTIONANDTHEASSOCIATEDEMISSIONS．BYANALYZINGTHESPECIALDRIVINGCYCLEOFCITYBUSANDCOMPARINGWITLLDIFFERENTTYPEOFREGENERAFIVESCHEMES，THISPAPERPROPOSEDASYSTERNSCHEMEWHICHISUSINGTHEHYDRAULICENERGYSTORAGEANDPARALLELCONNCEDONDRIVINGTECHNIQUES．NLEHYDRAULICSYSTEMUSESTHEBLADDERHYDRAULICACCUMULATORANDTHEPUMP／MOTOR勰THEENERGYSTORAGEANDTRANSFORMATIONPART，SOITHASCOMPACTSTRUCTUREANDTHERAPIDREACTION．ONTHEBASICOFTHEDYNAMICSANALYSISTOTHEBRAKINGPROCESS，THEPARAMETERSOFHYDRAULICSYSTEMAREFIGUREDOUT．THROUGHSIMULATION，THEPERFORMANCEOFHYDRAULICSYSTEMISDEMONSTRATED．THER鼬TLTSSHOWTHAT也EENERGYREGENERATIONSYSTEMISEFFECTIVETOIMPROVETHEFUELECONOMYOFCITYBUS．BASEDONTHEPARALLELCONNECTIONDRIVINGSTRUCTUREANDTHEGIVENVEHICLE．THEPOWERTRSINOFTHISSYSTEMWHICHINCLUDESELECTROMAGNETICCLUTCHANDODONTOIDCHAINDRIVEISDESIGNED．SOTHECONTROLLABILITYANDRELIABILITYOFTHESYSTEMAREIMPROVED．INTHEPAPER，EXPERIMENTALDESIGNFORBRAKINGENERGYREGENERATIONSYSTEMISALSOCONSTRUCTED．ACCORDINGTONATIONALSTANDARDGB／R12545．22001CIRCULATIONDRIVINGPATTEMSOFCITY，THEEXPERIMENTMETHODSAREDISCNSSED．KEYWORDSCITYBUS，REGENERATIVEBRAKINGENERGY，HYDRAULICACCUMULATOR，PUMP／MOTOR，PARALLELCONNECTIONDRIVINGⅡ

简介：燕山大学硕士学位论文发动机连杆裂解工艺参数确定及数值模拟姓名阎洪涛申请学位级别硕士专业材料加工工程指导教师张涛20060301燕山大学工学硕士学位论文ABSTRACTINRECENTYEARS，THEAUTOMOBILEINDUSTRYFLIESTODEVELOPSOON，THEMANUFACTURINGMETHODANDTECHNIQUESOFCONNECTINGRODHASPAY仃EMENDOUSCONCERNBYTHEDOMESTICANDINTERNATIONALASANEWTECHNIQUEOFCONNECTINGROD，FRACTURESPLITTINGTECHNIQUEHASBEENDEVELOPEDGRADUALLYATSOMEAUTOMOBILEDEVELOPEDCOUNTRYIN1990’S，ANDISAPPLYINGRADUALLYLARGESCALEPRODUCEREALM，ISIMPORTANTCHANGETOTHETRADITIONTECHNIQUESOFCONNECTINGROD，HAVEBECOMETHEIMPORTANTMARKTHATANATIONLAUNCHESENGINECONNECTINGRODMANUFACTURINGINDUSTRYDEVELOPMENTLEVELFRACTURESPLITTINGSKILLHASBEENRESEARCHEDDEEPLYBYABROADALTHOUGHTHEFRACTURESPLITTINGTECHNOLOGYOFCONNECTINGRODHASBEENACCEPTEDINMANYMOBILEMANUFACTURECOMPANIESINDOMESTIC，THEMOSTEQUIPMENTSHASIMPORTFROMABROAD，EVENTHEMATERIALSHAVEIMPORITHECORETECHNIQUEHASALWAYSBEENMONOPOLIZEDBYFOREIGNERTHEDOMESTICALSOSTALTTHERESEARCHOFTHETECHNIQUESTHEREARESTILLALOTSOFPROBLEMS，INCLUDINGPOSTSPLITTING，NONSPLITTING，THEDISTORTIONOFSPLITTINGFACEEREINRECENTPRODUCTTHOSEPROBLEMSINFLUENCEMEQUAL姆STABILITYOFPRODUCTSBUTTHEINFLUENCEPERCENTAGESONTHERESULTSOFFRACTURESPLITTINGOFCONNECTINGRODALEMANYMORE，BUTFIGHTNOWHOWTHOSEINFLUENCEPERCENTAGESONTHESPLITTINGRESULTSOFCONNECTINGRODARENOTOBVIOUSTHESELECTIONOFFRACTURESPLITTINGFORCEPARAMETERMAINLYDEPENDSONEXPERIENCEANDNOTHEORYCANABIDEBYINT11ISPAPERAIMATTHETECHNIQUEOFFRACTURESPLITTINGOFENGINECONNECTINGROD，THEMATERIALSFITTINGTOFRACTURESPLITTINGHAVEBEENANALYSED，ACCORDINGTOSOINEINFLUENCEFACTORSTHATTHEFORMERHASRESEARCHEDTHEINFLUENCETHATTHECHEMISTRYCOMPOSITIONSTOTHEMECHANICSFUNCTIONANDTHEPHYSICALFUNCTIONINSTEELHAVEBEENANALYZEDTHETHEORYOFQUASISTATICFRACTURESPLITTINGOFSUITABLECONNECTINGRODFORENGINEEA827HASBEENSTUDIEDAIMEDATTHENEWMATERIALII

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简介：价夕夕分类号L。广LUDC注1学位论文车辆轮重测试仪的设计题名和副题名己琴忠J卜刁可作者姓名指导教师姓名朱宏教授杨忠孝副教授电子科技大学成都职务、职称、学位、单位名称及地址申请专业学位级别硕士专业名称模式识别与智能系统论文提交日期20071论文答辩日期20073学位授予单位和日期电子科技大学答辩委员会主席评阅人2007年1月日注1注明国际十进分类法UDC的类号。ABSTRACTTHEWHEELWEIGHTTESTINSTRUMENT15ANINTELLIGENTELEETRONIEINSTRUMENTWHIEHHASTWOWORKMODESWORKINGTOGETHERWITHAEERTAINMECHANIEALINSTRUMENT，ITEANMEASURETHEWEIGHTOFTHEVEHICLEDEPENDINGONTHEUSER，5NEEDTHEMAJTECHNIQUEOFTHEINSTRUMENT15SUEHASRASTERSENS，ARMEONTROLLER，CPLDANDPICAPPLIEATIONDESIGN。THEINSTRUMENT15BASEDONARMCONTROLLER、CPLDPICINADJUSTINGWKMODE，ARMPROEESSOBTAINSTHEORIGINALDATUM，ANDTRANSMITSTHEEOEFFIEIENTSWHIEHHAVEEOMPUTEDBYTHEARITHMETIETOTHEMEMORYOFTHEMAINCONTROLLERINTESTWORKMODE，THEWEIGHTWHICHGETSFROMTHESPEEIALMEEHANIEALIMPLEMENT15PASSEDTOTHESPECIALPRESSUREVESSELTHENTHERASTERSENSORTESTSTHEOFFSETOFTHEPISTONOFTHEVESSELANDTRANSMITSITINTOORTHOGONALTWOLOADSINESIGNALSTHEINSTRUMENTSAMPLESTHESINESIGNALANDUSINGCPLDEOUNTSTHENUMBEROFTHESAMPLINGIMPULSESAFTERTHESYSTEMCONTROLLERREADSTHECOUNTEROFSAMPLINGIMPULSE，ITTRANSFERSTHEOFFSETINTOTHEREALNUMBERANDEOMPUTESTHEWEIGHTUSINGCURVEFITTINGALGORITHMAILASTITTRANSMITSTHEWEIGHTDATATOTHEDISPLAYPROEESSOR，ANDTHEDISPLAYPROEESSOREONTROLSTHEDISPLAYOFLEDTHENTHEWHEELWEIGHT15MEASUREDHITEGRATEDWITHTHECONTROLSUBSYSTEM，IT15AIMPTANTJOBTEALIZETHEAUTOMATIEMEASUREOFTHEWHEELWEIGHTAFTEREAREFULLYDESIGNING，WESUEEESSFULLYCOMPLETEALLTHETEEHNIEALTARGETSTHATUSERREQUESTSTHISINSTRUMENTHASMANYMERITS，SUCHASSIMPLEFRAMEWK，SAFETY，EONVENIENEE，HIGHLYRELIABILITY，STRONGEAPABILITYOFEMC，EASYTOUPDATEAND50ONKEYWDWHEELWEIGHTTESTINSTRUMENT，EOMPLEXPROGRAMMABLELOGIEDEVIEEEENTRALPROEESSINGUNIT，ORIGINALDATUM，RASTERSENSOR，EURVEFITTINGALGORITHM午

简介：点击查看更多一种双输入视频处理系统的设计与实现.pdf精彩内容。

简介：1054249仑肥工学大HEREIUNIVERSITYOFTECHNO警IOGY硕士学位论文MASTERDISSERTALRION论文题目堕耍花缝盟塑堕墨堕董隹能的髭堕里轮胎滚动特性研究学位类别J历硕士学科专业工程领域韭控电壬监作者姓名张麈埋导师姓名赳埕删蠼完成时间艘虹生量_且_一THERESEARCHONTHEEFFECTSOFTIRETREADPATTERNONADHESIONONWETROADANDROLLINGPERFORMANCEOFTIREABSTRACTTIREISALLIMPORTANTPARTOFVEHICLE，THEMAINRUN．IONOFTIREISBEARINGTHEWEIGHTOFVEHICLE，ANDTRANSMITSBRAKING,DRIVINGANDTURNINGFORCESTOTHEVEHICLE，ANDSHOCKABSORPTION．THEPERFORMANEAOFTIREHASCLOSELYRELATIONSHIPWIⅡLTHESAFETYANDMANEUVERABILITYOFVEHICLE．BECAUSEOFDYNAMICALLUBFICMIONOFWATERHYDROPLANINGWILLBEHAPPENEDWHENVEHICLERUNNINGINWETROADATAHIGHSPEED．ITSVERYDANGEROUS．ROUGHNESSOFROADANDTREAD，SPEEDOFVEHICLE，TIRETREADPATTERNAREALLCONTRIBUTEDTOTHEABILITYOFANTIHYDROPLANINGOFTIRE．ONTHEOTHERHAND，THERESEARCHOFROLLINGPERFORMANCEOFTIREISABASICWORKOFTHERESEARCHOFROLLINGDISSIPATION．IT’SALSOIMPORTANTTOSAVEENERGYANDENVKONMENTPROTECTION．THEEFFECTSOFTIRETREADPATTERNONADHESIONPERFORMANCEONWETROADANDROLLINGPERFORMANCEOFTIREALESTUDIED．THEVISCOUSHYDROPLANINGOFTREADISMODELEDANDANALYZED；THEMODELISBASEDONAVERAGEFLOWMODELTHATTAKESTHESQUEEZEACTION,HYDRODYNAMICACTIONANDSURFACEROUGHNESSOFROADINTOCONSIDERATION．THEEFFECTOFDRAINAGEOFTIRETREADPATTERNISALSOTAKENINTOACCOUNT．THROUGHMATHEMATICALANALYSIS，THEEFFECTSOFDIFFERENTTIRETREADPATTERNSARECOMPARED．PRESSUREDISTRIBUTIONOFTIRETREADUNITISANALYZEDINDEPTH．THERESULTSSHOWTHATADHESIONPERFORMANCEOFCROSSPATTCMTIRETREADISBETTERTHANOTHERTIRETREADPATTERNSANALYZEDINTHISARTICLE．THERESULTSPROVIDETHEORETICALFOUNDATIONFORTHEDESIGNOFANTIHYDROPLANINGTIRETREAD．INTHESTUDYOFROLLINGPERFORMANCEOFTIRE，ATHREEDIMENSIONFINITEELEMENTMODELOFRADIALTIREISSUCCESSFULLYDEVELOPEDTHROUGHMARC．BOUNDARYCONDITIONPROBLEMISALSOSUCCESSFULLYSOLVED．PERFORMANCEOFRADIALTIREINSTATICLOADING，STEADYROLLINGANDFREEROLLINGARCSIMULATEDBASED011THISMODEL．SOMEINFORMATIONOFROLLINGRESISTANCEISALSOINTRODUCEDFORTHEFURTHERSTUDYONROLLINGRESISTANCE．KEYWORDSTIRETREADPATTERN,DYNAMICALHYDROPLANING,AVERAGEFLOWMODEL，ROLLINGPERFORMANCE

简介：贵州大学2009届硕士研究生学位论文基于变帘线参数的膜式空气弹簧的建模与有限元仿真学位类别工程硕士专业机械设计及理论校内导师王自勤（教授）校外导师苏明（高工）研究生杨文杰中国﹒﹒﹒﹒贵州﹒﹒﹒﹒贵阳2009年5月分类号论文编号2006430102030密级公开贵州大学工程硕士学位论文51物理模型的建立3052有限元模型的建立31521橡胶气囊31522空气弹簧腔内气体33523实体模型及接触分析33524约束与加载33525网格与单元的划分3453变帘线参数有限元分析35531变帘线角35532变帘线层数36533变帘线密度36534变帘线层间距37535气体内压对垂直刚度的影响37第6章空气弹簧试验验证3961空气弹簧试验机3962空气弹簧静态刚度特性试验方法40第7章结论与展望4271结论4272展望43致谢44参考文献45附录48封底49

简介：分类号分类号TH164TH164密级级公开UDCUDC单位代码单位代码1042410424学位论文基于基于基于基于WEBWEBWEBWEB的产品定制与仿真系统研的产品定制与仿真系统研的产品定制与仿真系统研的产品定制与仿真系统研究究究究赵胜刚申请学位级别申请学位级别硕士学位硕士学位专业名称专业名称机械电子工程机械电子工程指导教师姓名指导教师姓名万丽荣职称教授山东科技大学二零零七年五月二零零七年五月RESEARCHRESEARCHRESEARCHRESEARCHONONONONTHETHETHETHESYSTEMSYSTEMSYSTEMSYSTEMOFOFOFOFWEBBASEDWEBBASEDWEBBASEDWEBBASEDPRODUCTPRODUCTPRODUCTPRODUCTCUSTOMIZATIONCUSTOMIZATIONCUSTOMIZATIONCUSTOMIZATIONSIMULATIONSIMULATIONSIMULATIONSIMULATIONAAAADISSERTATIONDISSERTATIONDISSERTATIONDISSERTATIONSUBMITTEDSUBMITTEDSUBMITTEDSUBMITTEDININININFULFILLMENTFULFILLMENTFULFILLMENTFULFILLMENTOFOFOFOFTHETHETHETHEREQUIREMENTSREQUIREMENTSREQUIREMENTSREQUIREMENTSOFOFOFOFTHETHETHETHEDEGREEDEGREEDEGREEDEGREEOFOFOFOFMASTERMASTERMASTERMASTEROFOFOFOFPHILOSOPHYPHILOSOPHYPHILOSOPHYPHILOSOPHYFFFFROMROMROMROMSHONGSHONGSHONGSHONGUNIVERSITYUNIVERSITYUNIVERSITYUNIVERSITYOFOFOFOFSCIENCESCIENCESCIENCESCIENCETECHNOLOGYTECHNOLOGYTECHNOLOGYTECHNOLOGYBBBBYYYYZHAOZHAOZHAOZHAOSHENGGANGSHENGGANGSHENGGANGSHENGGANGSUPERVISSUPERVISSUPERVISSUPERVISPROFESSPROFESSPROFESSPROFESSWANWANWANWANLIRONGLIRONGLIRONGLIRONGCOLLEGECOLLEGECOLLEGECOLLEGEOFOFOFOFMECHANICALMECHANICALMECHANICALMECHANICALELECTRONICELECTRONICELECTRONICELECTRONICENGINEERINGENGINEERINGENGINEERINGENGINEERINGMAYMAYMAYMAY2007200720072007

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简介：西南林学院硕士学位论文BJ2020N齿轮箱齿轮传动系统故障诊断姓名李加强申请学位级别硕士专业森林工程指导教师周新民20070501ABSTRACTWITHTHEDEVELOPMENTOFSCIENCEANDTECHNOLOGYHI曲PERFORMANCE，HIGHEFFICIENCYHIGHAUTOMATIONANDHIGHRELIABILITYHAVEBECOMETHETENDENCYOFMECHANICALEQUIPMENTSBECAUSEOFADVANTAGESOFTHEFIXEDTRANSMISSIONRATIO，THELARGETRANSMISSIONTORQUEANDTHECOMPACTSTRUCTURE，THEGEARBOXISWIDELYAPPLIEDTOADJUSTINGVELOCITYANDTRANSFERRINGPOWERALTHOUGHGEARISANIMPORTANTCOMPONENTOFMACHINEEQUIPMENTS，ITARISESSOMEFAULTSFREQUENTLYWHICHLEADSTOPOORPERFORMANCEOFTHEWHOLEMACHINEINOPERATINGCONDITIONITSDAMAGEANDFAILUREOFTENCAUSETROUBLEOFTRANSMISSIONSYSTEMORCOMPLETEEQUIPMENTTHUSLEADTHEGREATINCIDENTTHEGEARBOXTHECOREOFPOWERTRANSMISSIONITSCONDITIONMOFITOFINGANDFAULTDIAGNOSISHASRECEIVEDMOREANDMOREATTENTIONANDITWASINDICATEDTHATSEVENTYPERCENTOFGEARBOXFAULTEANLEFROMGEARANDAXISFAILURETHISTHESISWILLFOCUSONGEARDRIVESYSTEMOFBJ2020NGEARBOXTHEGEARBOXFAULTDIAGNOSISBASEDONCOMPAREDTHECHARACTERISTICFREQUENCYOFTHEGEARANDAXISWITHTHEANALYSISRESULTSOFVIBRATIONSIGNALSBYUSINGINV306ANDDASP2006DATAGATHERINGANDANALYSISSYSTEMBASEDONTHEFORMERACHIEVEMENTSANDRESULTS，INTHISPAPERFAULTCHARACTERISTICFREQUENCIESA∞EFFECTIVELYOBTAINEDFROMVIBRATIONSIGNALSOFBJ2020NGEARBOXBYUSINGPOWERSPECTLALNLDEMODULATEDRESONANCETECHNIQUEANDWAVELETANALYSISMETHODS，ANDCOMPLETEDTHEGEARDRIVESYSTEMOFBJ2020NGEARBOXSUCCESSFULLYTHEVIBRATIONSIGNALSALWAYSPRESENTTHATTHEMODULATEDSIGNALVARIEDPERIODICALLYWHENTHEGEARBOXHASFAULTS，INCLUDINGFREQUENCYMODULATEDANDAMPLITUDEMODULATEDBASEDONSTUDYTHEMODULATEDPRINCIPLEOFSIGNALS，ITREVEALSTHATTHESIDEFREQUENCIESOFMODULATEDSIGNALSAREDISTRIBUTEDBILATERALSYMMETRYTHELINCHPINUPONTHATTHESIGNALSARCMODULATEDWHENWEDIAGNOSETHROUGHMODULATEDSIGNALSTHEMODULMEDRESONANCETECHNIQUEISAPPLICABLEFORINCIPIENTFAULTSESPECIALLYBECAUSEITUPGRADESSIGNALTONOISEWAVELETANALYSISISATHEORYDEVELOPEDINTHEPASTDECADEITHASBEENSUCCESSFULLYUSEDINIMAGEPROCESSING，TELECOMMUNICATIONANDGEOPHYSICSINTHISPAPERSOMERESEARCHANDAPPLICATIONWORK谢THWAVELETANALYSISINTHEFIELDOFFAULTDIAGNOSISOFGEARBOXHASBEENCONDUCTEDITGAINEDEFFECTIVELYTHATDEAL诵THVIBRATIONSIGNALSBYMATLABWAVELETTOOLBOXITSTUDYONTHEGEARDRIVESYSTEMOFBJ2020NGEARBOXINTHETHESISTHEMECHANISMOF

简介：重庆大学硕士学位论文摩托车V型皮带无级变速器设计研究姓名任大鹏申请学位级别硕士专业机械设计及理论指导教师秦伟20050401重庆大学硕士学位论文英文摘要IIABSTRACTBECAUSEOFITSNOTABLEACTERISTICCONTINUOUSLYVARIABLETRANSMISSIONCVTISAPPLIEDEXTENSIVELYINMOTCYCLETRANSMISSIONSYSTEMTHEMOTCYCLEMANUFACTURINGINDUSTRYISONEOFSEVERALPILLARINDUSTRIESINCHONGQINGTHEVOLUMEOFPRODUCTIONMARKETINGOFMOTCYCLEINCHONGQINGACCOUNTSFMETHAN35OFTHEVOLUMEOFPRODUCTIONMARKETINGOFMOTCYCLEINCHINASOTHEPERFMANCEOFIMPROVINGTHECTVHASGREATMEANINGSTOTHECECOMPETITIONWHICHIMPROVESTHEMOTCYCLEINDUSTRYOFOURCITYSOFARINTHEDOMESTICMOTGARAGEINDUSTRYCVTISMAINLYCOPIEDASSEMBLEDTHROUGHIMPTINGCOMPONENTACCDINGTOFEIGNDESIGNCRITERIONTHECTVHASGREATERDISPARITYWITHTHEFEIGNSAMEPRODUCTONPERFMANCETHEREFEALOTOFPROBLEMSABOUTDESIGNREMAINUNSOLVEDINCVTDESIGNINGWEDGEANGLEOFBELTISOFTENBIGGERTHANWEDGEANGLEOFPULLEYSOINTHESTATICSTATEBECAUSEOFTHESELFLOCKINGPHENOMENONAROSEBYFRICTIONNOMATTERHOWEXERTHEAVYAXIALFCEONPULLEYITISIMPOSSIBLETOMAKETHEWKRADIUSOFTHEBELTCHANGEDWHILECVTISWKINGTHEWKRADIUSOFTHEVBELTCANBECHANGEDWITHTHECHANGEOFAXIALFCEMEANWHILETHEELASTICDEFMATIONOFVBELTWHICHAROSEBYFCEDONTHEBELTWILLIMPACTONTHESPEEDADJUSTMENTFACTSASCENTRALDISTANCEOFPULLEYTRANSMISSIONEFFICIENCYOFTHECVTALLTHESENEEDTOBECONSIDEREDINCVTDESIGNINGTOTHEABOVESITUATIONSTHISPAPERHASCARRIEDONTHEFOLLOWINGRESEARCH1SYSTEMATICALLYANALYSISTHEELASTICDEFMATIONOFTHEVBELT’SINFLUENCEONTHESPEEDADJUSTMENTFACTSOFTHECVTPROVIDETHEQUANTITATIVEANALYSISFMULAE2DOINGTHECONTACTFINITEELEMENTANALYSISBETWEENVBELTPULLEYTHROUGHANALYZINGTHEMODELTHATTHECVTTURNSINTOTHEWKINGRADIUSITISREACHEDTHERELATIONBETWEENTHEAXIALPRESSUREPULLACTINGONTHEVBELTCONTACTRADIUSFMAKINGCVTWKINGNMALLY3CONDUCTINGTHEEXPERIMENTTOTHEMATERIALPARAMETEROFTHEVBELTHAVINGOBTAINEDTHEMATERIALPARAMETEROFTHEVBELTWHILEDRAWNCOMPRESSEDHAVINGDRAWNTHECONCLUSIONONREGARDINGVBELTASTHESINGLEMATERIALWHILEANALYZING4CARRYINGONTHEEXPERIMENTOFVBELTINOPERATIONFVALIDATINGTHEANALYSISRESULTOFFINITEELEMENTANALYSISVERIFIEDTHEEXACTNESSDEPENDABILITYOFTHEANALYSISRESULTOFFINITEELEMENTANALYSISTHROUGHEXPERIMENT

简介：中国江河湖泊众多，泥沙淤积问题严重，大量淤积的泥沙使得河湖的行、蓄洪能力下降，对人民的生命财产造成威胁，对长江黄河等水域进行清淤疏浚已成为一项长期和艰巨的任务。在河湖疏浚及港口航道建设工程中，广泛应用绞吸式和耙吸式挖泥船。这些类水力式挖泥船，均采用泥泵、管道输送泥沙。泥沙输送过程动态特性直接关系到挖泥船作业的安全性和经济性，因而受到疏浚界的广泛关注。本文利用计算机VISUALBASIC编程语言，在对泥泵输沙管道系统进行数学描述的基础上，建立了泥泵启动、充水、输沙的动态仿真模型。针对不同土质特性，对单泵、双泵串联输送进行了仿真计算，得到了泥泵转速、扬程、柴油机扭矩及功率、泥泵入口压力、管道流速等一系列参数随时间的变化过程，揭示了疏浚过程中可能发生泥泵汽蚀、机组过载、管道流速低于临界流速等一系列不利现象。本文工作有助于进一步认识泥沙输送过程，为挖泥船安全高效运行和泥沙长距离输送提供了有益的参考依据。

简介：本文基于CADCAE软件，针对大功率发动机齿轮传动系统做了以下几个方面的工作1、建立精确的三维渐开线齿轮参数化模型应用PROENGINEER软件的“参数”和“关系”等方法，并考虑实际加工情况，通过创建精确的齿根过渡曲线等方法建立了精确的齿轮参数化模型；结合PROGRAM方法，实现了由同一个齿轮模型生成直齿轮、左旋斜齿轮和右旋斜齿轮功能；基于齿轮啮合原理，利用圆柱齿轮的啮合平面，实现了无干涉装配，并可获得任意的齿轮啮合状态。2、齿轮静态弯曲、接触有限元应力计算对齿轮几何模型进行了结构简化和边界简化；在静态弯曲应力计算中，采用扫掠划分的方法，选择齿轮端面网格和引导线，生成六面体单元，考虑了齿轮的实际啮合接触线作为加载位置；在静态接触应力计算中，选用更高效的映射法创建了一对啮合齿轮的有限元模型，选择具有代表性的啮合状态进行分析，并采用MPC单元的方法直接对主动轮施加扭矩。最后结合齿轮特点分析了应力结果。3、齿轮低速运转时的应力计算利用MARC提供的非线性分析功能，采用刚体控制方法，通过对主动轮施加较低的转速，对从动轮施加阻力矩，模拟齿轮在运转过程中的应力变化情况；研究了摩擦力对接触应力的影响，对一个轮齿啮合周期的应力变化作了详细的分析。4、齿轮弯曲疲劳寿命分析利用有限元分析应力结果，在MSCFATIGUE软件对斜齿轮齿根处进行了全寿命分析，求出了齿根处的寿命结果，并找出了失效区域，最后对指定的典型节点，进行了疲劳设计优化，并以载荷作为比例因子，对疲劳寿命结果进行了灵敏度分析。本文工作的完成，对提高发动机齿轮传动系统的寿命和可靠性，提高设计质量，降低设计费用，缩短开发周期，具有较好的工程实际意义。

简介：北京交通大学硕士学位论文机车工艺设备的柔性化方法研究与应用姓名陈春方申请学位级别硕士专业机械工程指导教师陆一平韩为民20060301ABSTRACTALONGWITH吐LEINCREASINGLYVIGOROUSCOMPETITIONINTHEINTEMATIONALMARKET，MEUP出瞳ECYCLEOFPRODUC“SMORE龇LDMORESHORTONTLEOTTLERSIDEINT11EEYESOFCONSMER，METHINGS血ATAREDI圩ERENT行OMOTTLERSAREMOREPOPUL札SOVARIOUSANDSMALLBATCHPRODUCINGPRODUCTSAREINURGENTNEED，WHICHONLYNEXIBLEM柚UFACTURINGSYSTEMFMSCAILMEETRAMERTLLANMETMDITIONALONEMACH抽EPRODUCTIONA工LDRIGIDAUTOMATICPRODLLCTIONLINECANMEETTHETHESIS、ⅣORKSMAINLYWITHMAINPIECEOFMELOCOMOTIVCCOMBUSTIONENGINEA【1EBEDOFMEROCKERSHAFT，MEPROCESSINGOFWTLICHISTHERESEARCHOBJECTBASEDONTHEPHILOSOPHYOFNEXIBLEMANUFACTURINGSYSTEM，ITSYSTEMATICALLYDEALSWITHMENEXIBILITYOFC1锄PINGFⅨTURC，SLIDPLATFO姗A11DU11ITHEADINTHEWORKPIECEPROCESS，ASWELLASSOMEIMPROVEMENTOFRELATEDTECHNOLOGYTHEMAINCOMENTSOFTHEMESISARCASFOLLOWS11’HEAUTHORSUMM撕ZESTLLENEXIBLLITYIDEAANDITSTRENDSINDEVEL叩MENTTHENHEGENEMLIZES，跚ALYSESANDCOMPARESV鲥OUSFLEXIBLEMETHODSTHROUGHLOCOMOTIVEM砌MFACT嘶NGEQUIPMEMBYMAL【访GCLAI】1PINGFIXTURE，SLIDPLA怕M，L】NITHEAD，HY胁啪ATICANDELECTRICALDEVICESTOBENEXIBLE，THCSPECIALPURPOSEMACHINEOFA1EBEDOFMCKERSHARWILLBEMORCFLEXIBLEINSTMCTUFE，DESIGNANDTECHNOLO豺2111EAUTHORINDIVIDUALLYGENERALIZESTHCFLEXIBLEMETHODSOFCLAIRLPINGFIXTURE，SLIDPL耐B蚰，UNITHEADACCORDINGTO也EPRACTICALSITUATIONANDOBJECTIVECONDITION，PROPERNEXIBLEMETHODSAREADOPTEDINORDERTOCOORDINATETHEREIATIONSBE“VEENECONOMICE拜BCTIVENESSANDNEXIBILI母111EREFORC，THEMACHININGAXLEBEDOFROCKERSHANCANREACHTHEGOALOFHI曲

简介：造型是工业设计永恒的主题。功能主义、使用设计乃至生活方式设计曾经覆盖了人们对设计的所有思考领域，但是一切功能、结构、人机、市场需求的实现都应该立足于以人为本，并最终归结于造型的表达，所以本文首先对造型做了一个深入的研讨。汽车作为对人类生活影响极大的所谓“第一商品”，其造型也必然的受到各方面因素的影响，并且反过来影响人类的各个层面，特别是其他种类商品的造型风格和趋势。因此，本文对于汽车的造型设计从科技、文化等各个方面展开研讨，并着重运用视觉心理学、审美生理学、仿生学、形态语义学等方法对汽车具体的造型风格、线型特征、视觉功能等做出自己的判断，继而得出较有普遍指导意义的法则。出于对社会生活中实际需求的体察，确立了社区用微型电动车的概念。为此，首先着手开发适用于该车型的新型电动车底盘，并且对其进行了动力性能和行驶状况的试验，取得了进一步开发的技术前提。在此之上，运用前述的法则，并细化为微型电动车的造型设计对策，完成下一步使用功能的设计，最终达到功能合理、使用方便、造型美观、绿色环保、经济适用的要求。