GMW 8477-2006 Trimmed Structure Modal Analysis Test Procedure

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1、WORLDWIDETestProcedureENGINEERINGGMW8477NoiseandVibrationSTANDARDSTrimmedStructureModalAnalysisTestProcedure3Resources1Scope3.1Facilities.ThetestfacilitymaybeanyinteriorNote:Nothinginthespecificationsupersedesenvironmentwithahardlevelsurfacetomounttheapplicablelawsandregulationsun

2、lessspecifictrimmedstructureandtestequipment.exemptionhasbeenobtained.AllfacilitiesshallbefreeofextraneousnoiseandNote:IntheeventofconflictbetweentheEnglishvibrationsourcesexample,electro-magneticanddomesticlanguage,theEnglishlanguageshallinterference,60HzintheUS).takeprecedence.3

3、.2Equipment.1.1Purpose.Thepurposeofthistestprocedureis3.2.1ProcessingEquipment.PCorWorkstationtodeterminethenaturalfrequenciesandbasedsoftwarecapableofperformingthemodalcorrespondingmodeshapesofatrimmedstructureparameterestimationprocessdescribedin5.1.3.inthe0to40Hzfrequencyrange.

4、3.2.2TestEquipment.AppendixA2contains1.2Foreword.Datafromtrimmedstructuremodalmoredetailedinformationregardingacquisitionsurveysisoftenusedasameansofdescribingthesystem,shaker,andtransducerrequirementsandstructuralperformanceofGMandcompetitiveexamples.vehicles.3.2.2.1DataAcquisiti

5、onSystem.AnacquisitionThistestprocedureshallbefollowedinitsentiretysystemfeaturingaminimumof12channelsofwiththeexceptionofthosedeviationslistedintheacquisition.RegionalDeviations.3.2.2.2ExcitationSignalGenerators.1.3Applicability.ThistestprocedureisAppropriatesourcemodule(s)(conta

6、inedintheappropriateforbenchmarkingcompetitiveandGMdataacquisitionsystem)orexternaldynamicsignalpassengervehiclesinthetrimmedstructurestate.generator(s)shallbeused.ThisprocedureisvalidforusewithbothBody3.2.2.3Exciters.Appropriateshaker(s)andFrameIntegralandBodyonFrametrimmedattach

7、ments.Thesemaybehydraulicorstructures.electro-dynamicactuated.Thetestingstandardsdefinedinthisdocumentare3.2.2.4InputTransducers.Appropriateloadintendedtopertainonlytoworkbeingdoneforthecell(s)and/orimpedancehead(s).corporatedatabaseandvalidation.Othertestingmethodsandinterpretati

8、onsareusefulandvalid,3.2.2.5Attac