1984 real-time hybrid computer simulation of a small turboshaft engine and control system

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1、N84-21548---NASATechnicalMemorandum83579'Real-TimeHybridComputerSimulationofaSmallTurboshaftEngineandControlSystemClintE.HartandLeonM.WenzeI......LewisResearchCenterCleveland,Ohio...........x-.........,t•.-.........................February1984IXl/AItl

2、_I[REAL-TIMEHYBRIDCOMPUTERSI

3、MULATIONOFASMALLTURBOSHAFTENGINEANDCONTROLSYSTEMClintE.HartandLeonM.WenzelNationalAeronauticsandSpaceAdministrationLewisResearchCenterCleveland,Ohio44135SUMMARYThisreportdescribesthedevelopmentofananalyticalmodelofasmallturboshaftenginedesignedforhelicopterpropulsionsystems.Themo

4、delequa-tionswereimplementedonahybridcomputersystemtoprovideareal-timenon-linearsimulationoftheengineperformanceoverawideoperatingrange.Thereal-timehybridsimulationoftheenginewasusedasatestbedforevaluat-ingamicroprocessor-baseddigitalcontrolmodule.Thisdigitalcontrolmodulewasdevel

5、opedaspartofanadvancedrotorcraftcontrolprogramthathasthelong-termgoalofrotorcraftflightandpropulsioncontrolintegration.Aftertestswiththehybridenginesimulationthedigitalcontrolmodulewasusedtocontrolarealengineinanexperimentalprogram.Ahybridsimulationoftheengine'selectrical-hydrome

6、chanicalcontrolsystemwasalsodeveloped.Thisprovidedaconvenientwayofvaryingthefuelflowandtorqueloadinputstothehybridenginesimulationforsimulatingtransientoperation.Acomparisonofsteady-statedataobtainedfromthesimulationandtheexperimentaltestsispresentedthatvalidatesthesimula-tionres

7、ults.Analyticalmodelequations,analogcomputerdiagrams,andadigitalcomputerflowchartaregivenintheappendixes.INTRODUCTIONNewmissionrequirementsforhelicoptersareleadingtodemandsforfasterresponsefromthehelicopterpropulsionsystemanditsassociatedcontrol.Themostcommonhelicopterpropulsions

8、ystememploysoneortwosmallturboshaftengines.Currentturboshaftenginecontrolsusepneumatic,hydraulic,andmechanicalcomponentstoperformthecontrolsensing,computation,andactua-tion.Therearelimitationsonthedynamicresponseofthesetypesofcom-ponentandthecomplexityofthecontrolfunctionsthatthe

9、ycanhandle.Onemeansofovercomingtheselimi