毕业论文外文翻译-CAN总线系统的实时对象调用

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1、大连交通大学2009届本科生毕业设计外文翻译InvocationofReal-TimeObjectsinaCANBus-SystemAbstractThepaperfocusesonmethodinvocationofreal-timeobjectsinaCAN-baseddistributedreal-timesystem.Asimpleobjectmodelisintroduced,whichallowstheconvenientmodellingofhardwareandsoftwarecomponents.Relatedtotheobjectmodel,two

2、issuesarediscussed.Firstly,amodelisintroducedwhichallowstoformandaddressobjectgroups.Thisreflectsabasicneedinareal-timesystemtodistributeinformationtomultipleclientsefficiently.Secondly,wediscussanapproachtoexpresstimingrequirementsforobjectinvocations.Toachievedistributedconsensusoncom

3、municationresourceaccess,anEDF-likeapproachisintroduced,whichtakesadvantageofknowledgeaboutdeadlines,thenumberofremainingcommunicationactivities,andtheremainingworst-caseexecutiontimefortheinvokedmethodateachpointoftime.1.IntroductionFuturecomputersystemswill,toalargeextent,monitorandco

4、ntrolreal-worldprocesses.Thisresultsinaninevitabledemandfortimelinessandreliability.Distributedsystemswhichinherentlyprovideimmunityagainstsinglefailuresareanadequatearchitecturetomeetthegoalofreliability.Additionally,becauserealworldapplicationsoftenrequirethespatiallydistributedcontro

5、lofelectromechanicalcomponents,adistributedsystemarchitecturebringscomputingpowertothepointswhereitisneeded.Theavailabilityofinexpensiveyetpowerfulmicrocontrollerssupportsadistributedsolution.Thisresultsinasystemmodelwhichiscomposedfromsmartcomponentsimplementingtheinstrumentationinterf

6、acetotherealworldcomprisingsensorsandactuators.Aconvenientwaytomodelsuchanenvironmentistouseanobject-basedapproachwhereobjectsencapsulateallkindsofentitiesnecessarytocontrolaphysicalprocess.Wecanidentifyatleasttwolayersinsystemsinteractingwiththerealworld.Alowerresponsivesystemleveltigh

7、tlycontrollingthesensor/actuatorinterfacetotheworldandahighersystemlevelresponsibleforinterpretationandevaluationoftheperceptionoftheworldascommunicatedbytheinstrumentationinterface.Inthislayer,higherleveldecisionsareperformed.Althoughthesedifferentlevelshavedifferentrequiremen