简介:Inthisstudy,anelectro-mechanicalvalve(EMV)systemfortheintakevalveofafourstroke,singlecylinder,overheadvalveandsparkignition(SI)enginewasdesignedandconstructed.AnenginewiththeEMVsystemandastandardengineweretestedtoobservetheeffectsoftheEMVonengineperformanceandemissionsatdifferentspeedsunderfullload.TheEMVengineshowedimprovedenginepower,enginetorqueandbreakspecificfuelconsumption(BSFC).A66%decreaseinCOemissionswasalsoobtainedwiththeEMVsystem,buthydrocarbons(HC)andNOxemissionsincreasedby12%and13%respectively.
简介:Basedonthetheoryofthermalradiation,acontacttypeopticalfiberpyrometerappliedinICengineisputforward.Itiscomposedofthreeparts:ablackbodyprobe,opticalsystem,electricalprocesssystem.Thekeytechnologyofdesignisdiscussed.Experimentisgiventoprovethatthepyrometerhasmuchhigherresponsivespeed,distinguishabilityandmuchlongerrunninglifethanotherpyrometers.
简介:Atpresent,thereisnoformalizeddescriptionoftheexecutingprocedureofworkflowmodels.Theprocedureofworkflowmodelsexecutinginworkflowengineisdescribedusingoperationalsemantic.Theformalizeddescriptionofprocessinstancesandactivityinstancesleadstoveryclearstructureoftheworkflowengine,haseasycooperationoftheheterogeneousworkflowenginesandguidestherealizationoftheworkflowenginefunction.Meanwhile,thesoftwareofworkflowenginehasbeencompletedbymeansoftheformalizeddescription.
简介:Inthispaper,thetheoryofQuasi-steadyisappliedtothecalculationsofturbochargersmatchingtothedieselenginesandperformanceprediction.Theengineperformancepredictionprogramswritteninlanguaechavebeenusedforcalculationsofvariousturbochargeddieselengines.Ithasbeenconfirmedbythecomparisonswithexperimentaldatathattheresultsofthecalcuationarereasonable,reliableandsatisfiedfortheengineeringapplications.
简介:Thenetworkmethodformodelingthermoacousticenginesisdescribed.Somesimulationresultsonacousticfieldsandphasesinengine,especiallyinthethermoacousticstackarepresentedandanalyzed.Theeffectsofsomekeyfactorsonperformanceofstackandenginesystemaresimulatedanddiscussed.Theseeffectfactorsincludethespacesofplatesofstack,thepositionofstackinenginesystem,thesourceparameterofstack,andthemeanworkingpressureoftheenginesystem.
简介:Systemsofphotosyntheticreactioncentreshavebeenmodelledasheatengines,whileithasalsobeenreportedthattheefficiencyandpowerofsuchheatenginescanbeenhancedbyquantuminterference—atraitthathasattractedmuchinterest.Wecomparetwodefinitionsoftheworkofsuchaphotosyntheticheatengine,i.e.definitionAusedbyWeimeretal.andBbyDorfmanetal.Wealsointroduceacoherentinteractionbetweendonorandacceptor(CIDA)todemonstrateareversibleenergytransport.Weshowthatthesetwodefinitionsofworkcanimpartcontradictoryresults,thatis,CIDAenhancesthepowerandefficiencyofthephotosyntheticheatenginewithdefinitionBbutnotwithA.Additionally,wefindthatbothreversibleandirreversibleexcitation-energytransportcanbedescribedwithdefinitionA,butdefinitionBcanonlymodelirreversibletransport.Asaresult,weconcludethatdefinitionAismoresuitableforphotosyntheticsystemsthandefinitionB.
简介:Preliminarydesignandsimulationofafreepistonenginesuitableforsmall-scaleenergyproductionindistributedenergysystemsispresentedinthispaper.Theproperties,particularlythepropertiesofgassealsoftheenginearesimulatedusingasimulationprogramdevelopedforthiscase,andtheresultsareutilizedinpreliminarymaindesignparameterselection.TheenginesimulationprogramwasdevelopedbycombiningandmodifyingthesourcecodesofthesimulationandcalculationprogramsobtainedfromHelsinkiUniversityofTechnology,TampereUniversityofTechnology,andLappeenrantaUniversityofTechnology.Becauseofthecontact-freelabyrinthsealusedinthepiston,theefficiencyofthemotorislowerthantheefficiencyofaconventionalmotorwithoillubricatedpistonrings.Ontheotherhand,thelackofbearinglosses,andthelackoflossesassociatedwithacrankshaftsystemandagearbox,aswellasthelackoflubricationoilexpenses,compensatesthiseffect.Asanetresult,thisnewmotorwouldperformslightlybetterthantheconventionalone.Beingcompletelyoil-free,itisveryenvironmentallyfriendly,anditsexhaustgasesarecompletelyfreeofoilresidualswhicharecausingproblemsinnormalgasmotors.
简介:Thispaperpresentsananalysisofthepotentialforenginespeedreductioninhydraulicequipment,takingintoaccountnotonlytheminimumenginespeedrequiredtomeetthecurrentflowdemand,butalsotheminimumspeedcapableofacceleratingtheenginetomeetincreasedflowdemandinthenearfuture.Thisisapredictivetask,asitrequiresanestimateoftheoperator'sintentiontoincreaseflowdemand.Wepresentananalysisofthepotentialforenginespeedreductionusingaworkcyclefroma40tonexcavatorloadingatruck,whichresultsinapotential33%reductioninthemeanenginespeedwithnoreductioninusefulworkrate.Wealsopresenttwonewenginespeedcontrolalgorithmstoperformthispredictivetask.
简介:Thisyearof2010witnessesthe10thanniversaryoftheForumofChina-AfricaCooperation(FOCAC),whichhasprovidedasolidplatformforfurtherdevelopmentofSino-AfricantraditionalfriendshipandusheredinanewperiodofChina-Africacooperationinallfields.ThisarticlehighlightsthemostprominentachievementsofFOCACoverthepastthreeyears,whichhopefullywillenablethereaderstobetterunderstandChina'srecentengagementwithAfrica.
简介:Throughanalyzingtheprincipleofdatasharinginthedata-basesystem,thispaperdiscussestheprincipleandmethodforintegratingandsharingGISdatabydataengine,introducesawaytoachievethehighintegrationandsharingofGISdataonthebasisofVCTinVC++,andpro-videsthemethodforunitingVCTintoRDBMSinordertoimplementaspa-tialdatabasewithobject-orienteddatamodel.
简介:Inthispaper,anautomotiveenginephasesignalsimulationalgorithmisproposedbasedonaclosed-loopfeedbackstrategy,anditscorrespondingmodelisbuilt.Thesignalincentivesarecarriedoutinthefront-end,andthesynchronizationcaptureandcomparisonareconductedintheback-end.Thephasesimulationofsignaloutputisachievedusingclosed-loopstrategy,whichcaneffectivelyeliminatetheinconsistencybetweencrankshaftandcamshaftphases,andthustheaccuracyandflexibilityofphasesignalgenerationareguaranteed.Experimentalresultsshowthattheproposedalgorithmisrealtime,andthedeviationofsimulatedsignalsfromactualphasesignalsissmall.
简介:Laboratoryexperimentswereconductedtostudythespallationbehaviourofthermalbarriercoatings(TBCs)onaero-engineturbinebladesmanufacturedbytheelectron-beamphysicalvapourdepositiontechnique(EB-PVD).Intactbladeswereheatedattemperature1135°Cinafurnaceforcertaintimeandthencooledtotheroomtemperatureinthelaboratorycondition.Itwasfoundthatnospallationoccurredduringcooling,butspallationhappenedatconstantroomtemperatureaftercooling.Thespallationmechanismisstudiedbyusingthemechanicalmodeldeveloped(Harvey2017andWang2017),whicharebasedonthehypothesisofpocketsofenergyconcentration(PECs).Someobservationsofthespallationbehaviourarewellpredictedbythemodel.