Free-Piston Stirling Convertor

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1、Sest,Inc.Free-PistonStirlingConvertorControllerDevelopmentatNASAGlennResearchCenterTimothyReganSest,Inc.Sest,Inc.ConceptRadioisotopeheatRadioisotopeheatsourceStirlingLinearStirlingsource•StirlingRadioisotopesubsystemalternatorssubsystemGenerator(SRG)ApplicationQinQinQoutQouti,vi,vControlle

2、ri,vSpacecraftloadFree-pistonStirlingConvertorControllerDevelopmentatGRC2Sest,Inc.Concept•TerrestrialgeneratorsmodulatethefueltoerkeepfrequencyPIDconstantfFUELENGINEAlt.REGTOLOAD•TerrestrialgeneratorsregulatethealternatorexcitationtokeepvoltageconstantFree-pistonStirlingConvertorController

3、DevelopmentatGRC3Sest,Inc.Concept•SRGapplicationusesconstantQinerPIDfQinFUELENGINEAlt.REGTOLOADFree-pistonStirlingConvertorControllerDevelopmentatGRC4Sest,Inc.Concept•SRGapplicationusespermanentermagnetPIDalternatorswithfnomeanstoQinFUELENGINEAlt.controlTOLOADalternatorexcitationFree-pisto

4、nStirlingConvertorControllerDevelopmentatGRC5Sest,Inc.Concept•InSRGapplication,totalloadiskepterconstantbyadjustingPIDparasiticloadfQinFUELENGINEAlt.TOLOADV•FrequencyislargelyrdictatedbyStirlingdynamics(lessthanPID1%variation)Free-pistonStirlingConvertorControllerDevelopmentatGRC6Sest,Inc.

5、Concept•EquilibriumoperationwhereloadpowercrossesenginepowerOperatingPointEnginePowervsLoadPower10090EnginePower80ExponentialLoad70CubicLoad605040Power(W)302010000.0020.0040.0060.008PistonAmplitude(m)Free-pistonStirlingConvertorControllerDevelopmentatGRC7Sest,Inc.SimplorerModel•UsedSimplor

6、ersimulationsoftware–ODE’s–Thermal–Mechanical–Electrical/electronicsQinQinTkhxQTkhx•Simplorermodel273+80HHTDC#13TDC#14allowsmultipleFcaseAC1AC2AC2AC1FcaseconvertorsCTCTAC++V•VarietyofcontrollersZDC-VM1ACFree-pistonStirlingConvertorControllerDevelopmentatGRC8Sest,Inc.SimplorerModel0.6380.80

7、00.9001.0001.122•Openloopstart-up150.0Macro7...VOUT....transientresponse100.0100.0helpfulincontroller50.050.000Voltagedesign.-50.0-50.0•Disturbancerejection0.6380.8000.9001.0001.122time(s)00.5001.0001.5002.0002.5003.600Macro71....00Voltage00.5001.0001.5002.000