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1、dynamicgustloadsfaa動態(tài)的陣風(fēng)載荷－動態(tài)的陣風(fēng)載荷－faadynamicgustloadsfaa動態(tài)的陣風(fēng)載荷－faaU.S.DepartmentofTransptationFederalAviationAdministrationAdvisyCircularSubject:DynamicGustLoadsDate:DRAFTInitiatedBy:ANM115ACNo:25.341X1.PURPOSE.Thisadv
2、isycircular(AC)describesacceptablemeansfshowingcompliancewiththerequirementsofTitle14CodeofFederalRegulations(14CFR)25.341Gustturbulenceloads.Section25.341specifiesthediscretegustcontinuousturbulencedynamicloadconditions
3、thatapplytotheairplaneengines.2.APPLICABILITY.2.1TheguidanceprovidedinthisdocumentisdirectedtoairplanemanufacturersmodifiersfeignregulatyauthitiesFederalAviationAdministration(FAA)transptairplanetypecertificationengineer
4、stheirdesignees.2.2ThematerialinthisACisneithermatynregulatyinnaturedoesnotconstitutearegulation.WhiletheseguidelinesarenotmatytheyarederivedfromextensiveFAAindustryexperienceindeterminingcompliancewiththerelevantregulat
5、ions.Thesemeansareissuedintheinterestofstardizationfguidancepurposestooutlineamethodthathasbeenfoundacceptableinshowingcompliancewiththestardssetfthintherule.Ifhoweverwebecomeawareofcircumstancesthatconvinceusthatfollowi
6、ngthisACwouldnotresultincompliancewiththeapplicableregulationswewillnotbeboundbythetermsofthisACresponseoftheairplanetoencounterswithgusts.4.2Howthevariousairplanemodelingparametersaretreatedinthedynamicanalysiscanhaveal
7、argeinfluenceondesignloadlevels.Thebasicelementstobemodeledintheanalysisaretheelasticinertialaerodynamiccontrolsystemacteristicsofthecompletecoupledairplane(figure1).Thedegreeofsophisticationdetailrequiredinthemodelingde
8、pendsonthecomplexityoftheairplaneitssystems.XXXXXXDRAFTAC25.341X3Figure1.BasicElementsoftheGustResponseAnalysisSTATICFLIGHTLOADSMODELATMOSPHERICMOTIONDYNAMICSSTRUCTURESTATIC1gFLIGHTLOADSDYNAMICLOADSLIMITGUSTLOADSAERODYNA
9、MICSYSTEMCONTROLSYSTEM4.3Designloadsfencounterswithgustsareacombinationofthesteadylevel1gflightloadsthegustincrementalloadsincludingthedynamicresponseoftheairplane.Thesteady1gflightloadscanberealisticallydefinedbythebasi
10、cexternalparameterssuchasspeedaltitudeweightfuelload.Theycanbedeterminedusingstaticaeroelasticmethods.4.4Thegustincrementalloadsresultfromtheinteractionofatmosphericturbulenceairplanerigidbodyelasticmotions.Theymaybecalc
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