[NASA美国太空总署资料(长期更新)].NASA-aiaa-2001.pdf

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1、AIAA-2001-1388LOWVELOCITYEARTH-PENETRATIONTESTANDANALYSIS*EdwinL.FasanellaUSArmyResearchLaboratory,VehicleTechnologyDirectorateHampton,VA23681YvonneJonesNASALangleyResearchCenterHampton,VA23681à¤NormanF.Knight,Jr.andSotirisKellasVeridianSystemsYorktown,VAAbstractdiffer

2、entconfigurationsarebeingstudiedforsuchvehicleswiththedesignrequirementtosurviveaModelingandsimulationofstructuralimpactsintoguidedimpactwithselectedareasoftheEarthÕssoilcontinuetochallengeanalyststodevelopsurfacewithouttheaidofaparachute.Developingaccuratematerialmode

3、lsanddetailedanalyticalanunderstandingofthisimpactscenariowillprovidesimulationstopredictthesoilpenetrationevent.Thisaddedrobustnesstothevehicledesignandincreasedpaperdiscussesfiniteelementmodelingofaseriesofreliabilityofthesystem.penetrometerdroptestsintosoftclay.Para

4、metricstudiesareperformedwithpenetrometersofvaryingAnadvancedtechnologytestprogramhasbeendiameters,masses,andimpactspeedstoamaximumdevelopedtomeetthischallenge.Theprogramwillof45m/s.Parametersinfluencingthesimulationprovideimportanttestresultsfortheoverallvehiclesuchas

5、thecontactpenaltyfactorandthematerialdesignandalsoforvalidatinganalyticalsimulationmodelrepresentingthesoilarealsostudied.Antools.Low-velocitypenetrometerdroptestswereempiricalrelationshipbetweenkeyparametersisperformedinNovember1998attheUtahTestanddevelopedandisshownt

6、ocorrelateexperimentalandTrainingRange(UTTR)intosoftclayfromabucketanalyticalresultsquitewell.Theresultsprovidetruckandahot-airballoon.Also,aseriesofdroppreliminarydesignguidelinesforEarthimpactthattestswereperformedfromahelicopterontosoilatmaybeusefulforfuturespaceexp

7、lorationsampleimpactvelocitiesupto45m/satUTTRinSeptemberreturnmissions.2000.HemisphericalpenetrometersofvaryingdiameterweredroppedtoprovideselecteddataforaIntroductionrangeofdesignparameterstosupportsamplereturnmissions.SomelimitedpenetrationandsoilFuturespacesciencemi

8、ssionswillinvolvethesamplingdatafromthelate1960Õsforlow-velocityacquisition,storage,andreturnofsamplematerialEarthimp