dynamic gust loads - faa動態(tài)的陣風載荷－faa _第1頁
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1、dynamicgustloadsfaa動態(tài)的陣風載荷－動態(tài)的陣風載荷－faadynamicgustloadsfaa動態(tài)的陣風載荷－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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