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1、Low-thrustMissionsforExpandingFoamSpaceDebrisRemovalIEPC-2011-126Presentedatthe32ndInternationalElectricPropulsionConference,Wiesbaden?GermanySeptember11–15,2011123P.PergolaA.RuggieroandM.AndrenucciUniversityofPisa,Pisa,56100,Italy4L.SummererESAAdvancedConceptsTeam,2201Noordwijk,TheNet

2、herlandsAbstract:Activespacedebrisremovalmissionsareanecessarywaytocontrolandreducedebrisgrowth,inordertopermitfuturesustainablespaceactivities.Themethodhereproposedcanbeclassifiedasamomentumexchangemethod,andinparticularitcanbethoughtasadragaugmentationsystem.Thecoreideaistodevelopasy

3、stemabletoapplyanexpandedfoamballaroundatargetdebrisenlargingitsarea-to-massratiotoincreasethenaturalatmosphericdragandthussignificantlydeceleratinganddeorbitingthedebris.Thedragaugmentationsystemhereproposeddoesnotrequireanydockingsystem;anuncontrolledre-entrytakesplaceendingwithaburn

4、upoftheobjectandthefoamintheatmospherewithinagiventimeframe.Themethodrequiresanefficientwaytochangeorbitsbetweentwodebris.ThepresentpaperanalysessuchasystemincombinationwithanElectricPropulsionsystem.Missiontime,propellantandfoammassrequirementsareassessedandapreliminaryplatformsizingi

5、spresented.NomenclatureA=debriscross-sectionalareaAD=debriscross-sectionalareaa=semi-majoraxisa=meanaccelerationa=atmosphericdragperturbationdragCd=dragcoefficient?t=maneuvertimeE=eccentricanomalye=eccentricityi=inclinationm=debrismassm0=spacecraftmassatthebeginningofthrusterfiringmp=p

6、ropellantmassm=averagespacecraftmassSC?=Earthgravitationalparameter1Ph.D.,AerospaceEngineeringDepartment,p.pergola@alta-space.com.2M.Sc.,AerospaceEngineeringDepartment,a.ruggiero@alta-space.com.3Professor,AerospaceEngineeringDepartment,m.andrenucci@alta-space.com.4Ph.D.,Head,ESAAdvance

7、dConceptsTeam,leopold.summerer@esa.int.1The32ndInternationalElectricPropulsionConference,Wiesbaden,GermanySeptember11–15,2011ρ=atmosphericdensityT=thrustV=orbitalvelocityVD=debrisvolumeV=relativevelocityr?=argumentofperigee?=rightascensionoftheascendingnodeI.IntroductionHEincreaseofs