NASA Technical Reports Server (NTRS) 20140008755: NASA Marshall Space Flight Center Controls Systems Design and Analysis Branch PDF
Preview NASA Technical Reports Server (NTRS) 20140008755: NASA Marshall Space Flight Center Controls Systems Design and Analysis Branch
Mighty Eagle Warm Gas Test Article Adaptive Augmenting Controller Overview Advanced Dynamics TheMightyEagleWarmGasTestArticle(WGTA)isarobotic The NASA Marshall Space Flight Center (MSFC) Flight Marshall Space Flight Center Mechanics and Analysis Division developed an Adaptive landertestbedbasedattheMarshallSpaceFlightCenterthatis maintains a critical national Augmenting Control (AAC) scheme for launch vehicles that usedtoinexpensivelytestalgorithmsandsensorsthatcouldbe capability in the analysis of improvesrobustnessandperformancebyadaptinganotherwise implementedinfuturespaceprograms.Originallydesignedand launch vehicle flight dynamics well-tuned classical control algorithm to unexpected builtin2010tosupportriskreductionoftheInternationalLunar andflightcertification ofGN&C environmentsorvariationsinvehicledynamics. Networkprogram,thevehiclehasbeenadaptedforadditional algorithms. MSFCanalystsare testing of optical Autonomous Rendezvous and Capture domainexpertsintheareasof ThephilosophythatdrovetheformulationoftheAACalgorithm technologyaswellasHazardAvoidancesoftwareusinganoff- flexible-body dynamics and SLS Flight Control System wasfirstandforemosttomaintainnominalsystemperformance the-shelfstereocamerasystem. control-structure interaction, andbecompatiblewithclassicalstabilitycriteria.Thealgorithm thrust vector control, sloshing providesadditionalrobustnessusingasimplearchitecturethat The WGTA's propulsion system (mono-propellant, pressure propellant dynamics, and canhelprecoverfrompoorperformanceandpreventordelay regulated)uses90%purehydrogenperoxideandsilverscreen advanced statistical methods. abortsinextremeoff-nominalconditions. catalystbedstoachieveflighttimesofaround45seconds.The Marshall’s modeling and Control System Block Diagram with AAC lander,aboutthesizeofapooltable,weighs~200kgdryand simulation expertise has TheAACalgorithmisaforwardloopgainmultiplicativeadaptive ~300kgwithafullloadoffuelandhas16thrusters:12Attitude supported manned spaceflight algorithmthatmodifiesthetotalattitudecontrolsystemgainin ControlSystem(ACS)thrustersthatorientthevehicle,3Descent forover50years. responsetosensedmodelerrorsorundesirableparasiticmode thrustersthatareresponsibleforverticalvelocitycontroland1 Structural Dynamics EarthGravityCancelling(EGC)thruster. TheEGCcontinuously resonances. AAC Flight Regions Adaptive Law throttlestooffset5/6thsofthevehiclesweightasfuelisburnedin ordertosimulatelunargravity,1/6ththatofEarth. Guidance, Navigation, and Flight Testing of the Adaptive Augmenting Controller Control Marshall’sunparalleledcapabilityin The Space Launch System (SLS) flight software prototype, launch vehicle guidance, including the adaptive component, was recently tested on a navigation,andcontroltechnology pilotedF/A-18aircraftatDrydenFlightResearchCenter(DFRC). stems from its rich heritage in Dryden’sadvancedtechnologyforin-flightdynamicsimulationon developing,integrating,andtesting theFull-ScaleAdvancedSystemsTestbed(FAST)wasleveraged launch vehicle GN&C systems Flight variables during extreme toconductanextensiverisk-reductionflightcampaign.Scenarios Filter Optimization dating to the early simulated low performance weredesignedspecificallytoevaluatetheAACalgorithmand Mercury‐Redstone and Saturn ensure its ability to achieve the expected performance vehicles. The Marshall team is improvementswithnoadverseimpactsinbothnominalandoff- continuously developing novel nominalscenarios.Marshalldevelopedanin-flightSLSmodel methods for design, including suchthatthecontroller“thought”itwasflyingSLS.102launch advanced techniques for vehicle-like trajectories over sixflight tests werecompletedin large‐scale optimization and NovemberandDecember2013atDFRC.Alltestobjectiveswere analysis. successfullymetandtheAACalgorithm'scapability,robustness, andreproducibilityhavebeensuccessfullydemonstrated. NASA 853 Full-Scale Advanced Gain adaptation to Monte Carlo Analysis Systems Testbed increase performance Advanced On-Orbit Guidance, Navigation, and Control Small Projects Rapid Integration & Test Environment Flight Robotics Laboratory Overview MarshallSpaceFlightCenter’sguidance,navigation,andcontrol expertiseextendstothesupportoforbitalmissionoperations, The Small Projects Rapid Integration & Test Environment TheFlightRoboticsLab(FRL)atMarshallSpaceFlightCenter including trajectory optimization, autonomous rendezvous and (SPRITE) Lab at Marshall Space Flight Center aids in the provides a full scale, integrated simulation capability for the docking (AR&D), on-orbit control system algorithm design, developmentandverificationofcubesatflightsoftwareinareal- supportofthedesign,development,integration,validation,and analysisoflow-Gpropellantslosh,navigationanalysis,andthe timesimulation.EngineersatSPRITEpartnerwithuniversities operationoforbitalspacevehicles. development of novel and enabling guidance algorithms for and other third parties to provide cubesat expertise and emerging mission concepts such as asteroid rendezvous and simulationcapabilities. TheFRLisbuiltondevelopedtechnologiessuchasairbearing autonomouson-orbitassembly. Marshallexpertiseisbackedby floors,servodriveoverheadroboticsimulators,precisiontargets, arichheritageofsupportingmannedorbitalmissions,including SPRITEhasa modular,layereddesignthatevolvedfromthe gimbals,6degrees-of-freedommobilityunits,andamanipulator Apollo,Shuttle,andtheInternationalSpaceStation. Portable SPRITE SystemsIntegrationLaboratory(SIL),developedforAresIand andvisualsystemevaluationfacilities. Flight Robotics Lab and precision floor hardware-in-the-loop simulation SLS for avionics and software integration and testing. This designsupportsrapid reconfigurationforsatellitesandrobotic Thefacilityiscenteredarounda44’x86’precisionairbearing systems.SPRITE’splantmodels,algorithms,andflightsoftware floor–thelargestofitskind. developmentisbasedonexperiencewiththeFast,Affordable, Science&TechnologySatellite(FASTSAT). Smallandlargeairsledsareusedontheairbearingfloor.The airsledsholda400lb.payload.An8DOFoverheadgantry, AportableversionofSPRITE’shardware-in-the-loopsimulation calledtheDynamicOverheadTargetSimulator,providesan800 capabilityhasbeendeveloped.Itisintheformfactorofasmall lb.payloadcapabilityforsimulatingrelativemotionwithrespect suitcaseandcanthusbetakentothecustomer’slocation.In toafixedtargetonthefacilityfloor.Acomputersystemprovides addition,theSPRITE’shardwarecanbecustomizedtomeetthe inversekinematicsandallowsthegantrytoactasatargetoras customer’sflightcomputerhardwareinterfaces. the6DOFrendezvousvehicle.Thetargetreactiondynamicsare simulatedthroughforce/torquefeedbackfromsensorsmounted atthepayloadinterface. Air bearing spacecraft simulator Interim Cryogenic Propulsion Stage (ICPS) and the Orion Multi-Purpose Crew Vehicle (MPCV)
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