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1、ComputationalMethodologyforthePredictionofFunctionalRequirementVariationsAcrosstheProductLife-Cycle112GuillaumeMandil,AlainDesrochers,AlainRivière1UniversitédeSherbrooke,Départementdegéniemécanique,2500boulevarddel’université,SherbrookeQuébec,CanadaJ1K2
2、R12LISMMA,3rueFernandHainaut,F-93407Saint-OuenCedex,FranceGuillaume.Mandil@Usherbrooke.caThegreatmajorityofengineeredproductsaresubjecttothermo-mechanicalloadswhichvarywiththeproductenvironmentduringthevariousphasesofitslife-cycle(machining,assembly,int
3、endedserviceuse…).Thoseloadvariationsmayresultindifferentvaluesofthepartsnominaldimensions,whichinturngeneratecorrespondingvariationoftheeffectiveclearance(functionalrequirement)intheassembly.Usually,andaccordingtothecontractualdrawings,thepartsaremeasu
4、redafterthemachiningstage,whereastheinterestingmeasurementvaluesaretheonestakeninservicefortheyallowthepredictionofclearancevalueunderoperatingconditions.Unfortunately,measurementinoperatingconditionsmaynotbepracticaltoobtain.Hence,themainpurposeofthisr
5、esearchistocreate,throughcomputationsandsimulations,linksbetweenthevaluesoftheloads,dimensionsandfunctionalrequirementsduringthesuccessivephasesofthelifecycleofsomegivenproduct.Themethodologypresentedisorganisedinthreesuccessivesteps.Firstly,afunctional
6、requirementischosenbytheuser,andthecorrespondingdimensionchainisextractedfromtheComputerAidedDesign(CAD)model.Inordertobeindependentfromthedesignparameterssetbythedesigner,thispaperusestheTTRS(TechnologicallyandTopologicallyRelatedSurfaces)concepttorela
7、tethefunctionalsurfaceswithinagivendimensionchaintosomecorrespondingfunctionalrequirementatthemanufacturingandassemblyphaseoftheproductlife-cycle.Practicallyspeaking,thisleadstothedefinitionofasetofnominaldimensionsthatserveasabaselineforthesubsequentph
8、asesoftheproductlife-cycle.Thesecondstepconsistsincalculatingthestrainsonthepartsunderthermo-mechanicalloadsinoperatingconditions.GenerallythiswillbedoneusingFiniteElementsAnalysis(FEA)orexistingtheoreticalformulations.Asthisstag
