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1、Flight-controlsystemarchitectureoptimizationforfly-by-wireairlinersChristopheBAUER∗andKristenLAGADEC†AirbusFrance,ToulouseChristianBES`‡andMarcelMONGEAU§Universit´edeToulouse,FranceThedesignproblemofaflight-controlsystemonalargefly-by-wireairlineristofindcombinationsofactuator(s),
2、powercircuit(s),com-puter(s)foreachmovable,soastofulfilltheconstraintsimposedbythesafetyregulations,whilekeepingtheresultingsystemweightaslowaspossible.Thetrendtowardsmoreelectricalaircraftmakesitharderandhardertodetermine,inareasonablecomputertime,opti-malarchitecturesbytradit
3、ionaltrial-and-errormethods.Actuallynewpowersourcesandactuatortechnologiesoffermanymoreimplementa-tionchoices,andleadtoanextremecombinatorialcomplexity.There-fore,traditionaldesignprocesseshavetobeassistedwithautomaticoptimization.Thispaperintroducesaflight-controlarchitectureop
4、ti-mizationprocess,intendedasadecisionaidforsystemengineersatearlystagesoftheflight-controlarchitecturedefinition.Wepresentanopti-mizationmodelforthedesignprocess,basedonasafetyconstraintandaweightcriterion.WestartbyreducingtheinitialsearchdomainbyintroducingthenotionofSurfacepo
5、ssiblearchitecture.Surfacepossiblearchitecturesaresubsetsoftheinitialsearchdomainwitchareconstructedbytakingintoaccounttechnologicalconstraintsandempiricalpractices.Theseabovesubsetsaregeneratedoutsidetheoptimizationloops.Oncethesearchhasbeenreduced,weuseanadaptationofbranch-a
6、nd-boundmethodstosolvetheremainingdiscreteoptimizationproblem.Finally,anapplicationtotheAirbusA340rollcontrolsystemisadressed.An∗Ph.D.Student,Flight-ControlSystemsDepartment.†Engineer,Flight-ControlSystemsDepartment.‡Professeur,LaboratoiredeG´enieM´ecaniquedeToulouse,Universit
7、´ePaulSabatier.§MaˆıtredeConf´erence,Universit´ePaulSabatier,onleaveatLAAS-CNRS.1of17exactoptimumisfoundamong1015possiblearchitecturesinlessthan25minutesonastandarddesktopcomputer.I.IntroductionThetrendtowardsmoreelectricalaircraftisgraduallybackinguporreplacingthehydrauliccir
8、cuitsfeedingtheflight-controlactuatorswithelectricalpower.This
