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Time-frequency decomposition based modal parameter identification

1. Useofcrosstimefrequencyestimatorsforstructuralidentificationinnon-stationaryconditionandunderunknownexcitation. JournalofSoundandVibration,[link widoczny dla zalogowanych], 2000; 273 (5) :775-79114MorrisJM, LuYH. DiscreteGaborexpansionofdis-cretetimesignalsinZ (Z) viaframetheory. IEEETransactionsonSignalProcessing,[link widoczny dla zalogowanych], 1994; 40:155-18115QianS. ChenDP. Jointtimefrequencyanalysis-meth-odsandapplication. PrenticeHallPTR. 1996ModalParameterIdentificationUsingSignalDecompositioninTime-FrequencyDomainZhangZhiyXuXiuzhongHuaHongxingHuangZhen (InstituteofVibration. ShockandNoise, ShanghaiJiaotongUniversityShanghai,[link widoczny dla zalogowanych], 200030) AbstractAnewmethodconcerningmodalparameteridentificationoflineartimeinvariantsystemsispresentedinthispaper. InlightoftheGabortheoryofsignaldecomposition. responsesofamulti-degree-of-freedomsystemcanbedecomposedintouncoupledsignals. vibratingatasinglenaturalfrequency. Giventheseuncoupledsignals,[link widoczny dla zalogowanych], parameterestimationcanbesubse-quentlyconductedwithcommonmethods. Comparedwithtraditionalmethods, theproposedapproachrequiresnoinputsignalexceptforresponsesignalsgeneratedbyunknownenvironmentalexcitationandnomatterwhetheritisstationaryornot. Inthesenseoflessrestrictiononthein-outsignals, theapproachbasedonsignaldecompositionintime-frequencydomainisverygenera1. Anumericalexampleofasimplysupportedbeamundernon-stationaryexcitationisalsopresentedtodemonstratetheeffectivenessoftheproposedmethod. Keywords: randomsignals; modalparameteridentification; signaldecomposition; Gaborexpansion male first author Yi Zhang ,[link widoczny dla zalogowanych], postdoctoral students March 1970 l1 . Phone : (021) 62810031; E-mail: chychangcn @ yahoo. corn

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