学科分类
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54 个结果
  • 简介:Inthisstudy,anelectro-mechanicalvalve(EMV)systemfortheintakevalveofafourstroke,singlecylinder,overheadvalveandsparkignition(SI)enginewasdesignedandconstructed.AnenginewiththeEMVsystemandastandardengineweretestedtoobservetheeffectsoftheEMVonengineperformanceandemissionsatdifferentspeedsunderfullload.TheEMVengineshowedimprovedenginepower,enginetorqueandbreakspecificfuelconsumption(BSFC).A66%decreaseinCOemissionswasalsoobtainedwiththeEMVsystem,buthydrocarbons(HC)andNOxemissionsincreasedby12%and13%respectively.

  • 标签: 氮氧化物排放量 发动机气门 火花点火 单缸 电性能 燃油消耗率
  • 简介:Basedonthetheoryofthermalradiation,acontacttypeopticalfiberpyrometerappliedinICengineisputforward.Itiscomposedofthreeparts:ablackbodyprobe,opticalsystem,electricalprocesssystem.Thekeytechnologyofdesignisdiscussed.Experimentisgiventoprovethatthepyrometerhasmuchhigherresponsivespeed,distinguishabilityandmuchlongerrunninglifethanotherpyrometers.

  • 标签: 光纤高温计 集成电路 燃烧 光纤传感器
  • 简介:Atpresent,thereisnoformalizeddescriptionoftheexecutingprocedureofworkflowmodels.Theprocedureofworkflowmodelsexecutinginworkflowengineisdescribedusingoperationalsemantic.Theformalizeddescriptionofprocessinstancesandactivityinstancesleadstoveryclearstructureoftheworkflowengine,haseasycooperationoftheheterogeneousworkflowenginesandguidestherealizationoftheworkflowenginefunction.Meanwhile,thesoftwareofworkflowenginehasbeencompletedbymeansoftheformalizeddescription.

  • 标签: 工作流 过程模型 活度 软件控制
  • 简介:Inthispaper,thetheoryofQuasi-steadyisappliedtothecalculationsofturbochargersmatchingtothedieselenginesandperformanceprediction.Theengineperformancepredictionprogramswritteninlanguaechavebeenusedforcalculationsofvariousturbochargeddieselengines.Ithasbeenconfirmedbythecomparisonswithexperimentaldatathattheresultsofthecalcuationarereasonable,reliableandsatisfiedfortheengineeringapplications.

  • 标签: 透平机 内燃机 性能鉴定 准稳定法
  • 简介:一个零维的单个地区的双曲线模型被介绍在成层的电荷引擎预言燃料燃烧速率,并且预言成层的电荷引擎的全面表演与GT力量是综合的。模型为在不同电荷地区计算燃料燃烧速率由二指数的功能组成。模型因素由一种非线性的曲线试穿技术的redetermined,基于在中间、低的负担从30cases获得的试验性的数据。结果证明在测量并且计算的柱体压力之间的好同意,和在计算、测量的柱体压力之间的偏差是不到5%。零维的单个地区的双曲线模型在为成层的电荷引擎当模特儿的燃烧是成功的。

  • 标签: 分层进气 内燃机 汽油发动机 燃烧速率 模拟模型
  • 简介:Thenetworkmethodformodelingthermoacousticenginesisdescribed.Somesimulationresultsonacousticfieldsandphasesinengine,especiallyinthethermoacousticstackarepresentedandanalyzed.Theeffectsofsomekeyfactorsonperformanceofstackandenginesystemaresimulatedanddiscussed.Theseeffectfactorsincludethespacesofplatesofstack,thepositionofstackinenginesystem,thesourceparameterofstack,andthemeanworkingpressureoftheenginesystem.

  • 标签: 萎蔫
  • 简介:Systemsofphotosyntheticreactioncentreshavebeenmodelledasheatengines,whileithasalsobeenreportedthattheefficiencyandpowerofsuchheatenginescanbeenhancedbyquantuminterference—atraitthathasattractedmuchinterest.Wecomparetwodefinitionsoftheworkofsuchaphotosyntheticheatengine,i.e.definitionAusedbyWeimeretal.andBbyDorfmanetal.Wealsointroduceacoherentinteractionbetweendonorandacceptor(CIDA)todemonstrateareversibleenergytransport.Weshowthatthesetwodefinitionsofworkcanimpartcontradictoryresults,thatis,CIDAenhancesthepowerandefficiencyofthephotosyntheticheatenginewithdefinitionBbutnotwithA.Additionally,wefindthatbothreversibleandirreversibleexcitation-energytransportcanbedescribedwithdefinitionA,butdefinitionBcanonlymodelirreversibletransport.Asaresult,weconcludethatdefinitionAismoresuitableforphotosyntheticsystemsthandefinitionB.

  • 标签: QUANTUM WORK HEAT ENGINE PHOTOSYNTHESIS
  • 简介:Preliminarydesignandsimulationofafreepistonenginesuitableforsmall-scaleenergyproductionindistributedenergysystemsispresentedinthispaper.Theproperties,particularlythepropertiesofgassealsoftheenginearesimulatedusingasimulationprogramdevelopedforthiscase,andtheresultsareutilizedinpreliminarymaindesignparameterselection.TheenginesimulationprogramwasdevelopedbycombiningandmodifyingthesourcecodesofthesimulationandcalculationprogramsobtainedfromHelsinkiUniversityofTechnology,TampereUniversityofTechnology,andLappeenrantaUniversityofTechnology.Becauseofthecontact-freelabyrinthsealusedinthepiston,theefficiencyofthemotorislowerthantheefficiencyofaconventionalmotorwithoillubricatedpistonrings.Ontheotherhand,thelackofbearinglosses,andthelackoflossesassociatedwithacrankshaftsystemandagearbox,aswellasthelackoflubricationoilexpenses,compensatesthiseffect.Asanetresult,thisnewmotorwouldperformslightlybetterthantheconventionalone.Beingcompletelyoil-free,itisveryenvironmentallyfriendly,anditsexhaustgasesarecompletelyfreeofoilresidualswhicharecausingproblemsinnormalgasmotors.

  • 标签: 自由活塞发动机 迷宫密封 流体动力学模型 分布式能源系统 模拟仿真 密封性能
  • 简介:Thispaperpresentsananalysisofthepotentialforenginespeedreductioninhydraulicequipment,takingintoaccountnotonlytheminimumenginespeedrequiredtomeetthecurrentflowdemand,butalsotheminimumspeedcapableofacceleratingtheenginetomeetincreasedflowdemandinthenearfuture.Thisisapredictivetask,asitrequiresanestimateoftheoperator'sintentiontoincreaseflowdemand.Wepresentananalysisofthepotentialforenginespeedreductionusingaworkcyclefroma40tonexcavatorloadingatruck,whichresultsinapotential33%reductioninthemeanenginespeedwithnoreductioninusefulworkrate.Wealsopresenttwonewenginespeedcontrolalgorithmstoperformthispredictivetask.

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  • 简介:满足为海洋的遥感数据出版的有效管理和网的要求,一台空间数据库引擎,命名MRSSDE,独立地被设计。MRSSDE的逻辑模型,物理模型,和最优化法详细被讨论。比作ArcSDE,它是空间数据库引擎的领先的产品,MRSSDE证明了更有效。

  • 标签: 网络发布 海洋数据库引擎 测量方法 海洋工程
  • 简介:Thisyearof2010witnessesthe10thanniversaryoftheForumofChina-AfricaCooperation(FOCAC),whichhasprovidedasolidplatformforfurtherdevelopmentofSino-AfricantraditionalfriendshipandusheredinanewperiodofChina-Africacooperationinallfields.ThisarticlehighlightsthemostprominentachievementsofFOCACoverthepastthreeyears,whichhopefullywillenablethereaderstobetterunderstandChina'srecentengagementwithAfrica.

  • 标签: 非合作 中国 论坛 非洲 引擎 通用
  • 简介:Throughanalyzingtheprincipleofdatasharinginthedata-basesystem,thispaperdiscussestheprincipleandmethodforintegratingandsharingGISdatabydataengine,introducesawaytoachievethehighintegrationandsharingofGISdataonthebasisofVCTinVC++,andpro-videsthemethodforunitingVCTintoRDBMSinordertoimplementaspa-tialdatabasewithobject-orienteddatamodel.

  • 标签: 数据库 地球空间信息 数据共享 GIS VC++ VCT
  • 简介:Inthispaper,anautomotiveenginephasesignalsimulationalgorithmisproposedbasedonaclosed-loopfeedbackstrategy,anditscorrespondingmodelisbuilt.Thesignalincentivesarecarriedoutinthefront-end,andthesynchronizationcaptureandcomparisonareconductedintheback-end.Thephasesimulationofsignaloutputisachievedusingclosed-loopstrategy,whichcaneffectivelyeliminatetheinconsistencybetweencrankshaftandcamshaftphases,andthustheaccuracyandflexibilityofphasesignalgenerationareguaranteed.Experimentalresultsshowthattheproposedalgorithmisrealtime,andthedeviationofsimulatedsignalsfromactualphasesignalsissmall.

  • 标签: CLOSED-LOOP CONTROL ENGINE electronic CONTROL unit
  • 简介:为平衡4击的燃料注射调整的一个模型联合geneset的六台柱体柴油机引擎被在由机轴的速度变化的频率分析操作引擎检测不平衡开发。在这个工作,机轴被认为是僵硬身体,以便它的尖速度的变化能直接被相关到全部的煤气压力的转矩。由分析仅仅更低的泛音订单,速度变化光谱能滤出机轴的动态反应生产的失真。这些泛音订单带的信息允许建立在大小和引擎的平均煤气的压力转矩之间的关联,并且检测不平衡并且识别有缺点的柱体。详细说明的试验性的读在在护胫棉花有限公司Pune的测试床上联合genset的柴油机引擎上被拿,印度。

  • 标签: 柴油机发电机组 通过检测 嵌入式 失衡 多缸 气体压力
  • 简介:在IBM和SUN之间关于收购的传闻满天飞的同时,GoogleAppEngine宣布支持Java无疑是给Java社区打了一剂强心针。4月8日,GAE(GoogleAppEngine)开发团队在官方博客上面宣布了这一消息,随后开放了一万名用户申请Java语言支持的名额。与此同时,在GAE的在线文档上面,已经发布了Java相关的开发者指导说明和文档,

  • 标签: JAVA语言 Google ENGINE App 引爆 开发团队
  • 简介:Laboratoryexperimentswereconductedtostudythespallationbehaviourofthermalbarriercoatings(TBCs)onaero-engineturbinebladesmanufacturedbytheelectron-beamphysicalvapourdepositiontechnique(EB-PVD).Intactbladeswereheatedattemperature1135°Cinafurnaceforcertaintimeandthencooledtotheroomtemperatureinthelaboratorycondition.Itwasfoundthatnospallationoccurredduringcooling,butspallationhappenedatconstantroomtemperatureaftercooling.Thespallationmechanismisstudiedbyusingthemechanicalmodeldeveloped(Harvey2017andWang2017),whicharebasedonthehypothesisofpocketsofenergyconcentration(PECs).Someobservationsofthespallationbehaviourarewellpredictedbythemodel.

  • 标签: Thermal BARRIER coating Interface FRACTURE SPALLATION