Abstract: MannedmaneuveringunitsmadebyAmericanandtheSovietUnionbothusetwosetsofindependentpropulsionsystems,whicharebackupforeachother.Thebackuppropulsionsystemcantaketheplaceofthefailurepropulsionsystem,buttherearenofurthersafeguardsforthebackupsystem.Thetraditionalschemerestrictsthesafetyandextravehicularability.Basedontheconventionalpropulsionmodeanemergencypropulsionmodewasproposed.Differentstrategieswerecarriedoutaccordingtothepositionalrelationshipofthefailuredthrusters.Theremainingeffectivethrusterstoensurethe6-DOFcontrolwerecombined.Calculationandsimulationresultsindicatethat,theemergencypropulsioncancompletethetaskofextravehicularactivitieswithreductionofpropulsion,andtheschemeisfeasible.

Key words: mannedmaneuveringunit, configurationofthethrusters, redundantdesign, thrusterfault, commandallocationalgorithm