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 Wysłany: Nie 3:07, 08 Maj 2011 Temat postu: mbt shoes sale Time-frequency decomposition based |
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Time-frequency decomposition based modal parameter identification
1. Useofcrosstimefrequencyestimatorsforstructuralidentificationinnon-stationaryconditionandunderunknownexcitation. JournalofSoundandVibration, 2000; 273 (5) :775-79114MorrisJM,[link widoczny dla zalogowanych], LuYH. DiscreteGaborexpansionofdis-cretetimesignalsinZ (Z) viaframetheory. IEEETransactionsonSignalProcessing, 1994; 40:155-18115QianS. ChenDP. Jointtimefrequencyanalysis-meth-odsandapplication. PrenticeHallPTR. 1996ModalParameterIdentificationUsingSignalDecompositioninTime-FrequencyDomainZhangZhiyXuXiuzhongHuaHongxingHuangZhen (InstituteofVibration. ShockandNoise,[link widoczny dla zalogowanych], ShanghaiJiaotongUniversityShanghai, 200030) AbstractAnewmethodconcerningmodalparameteridentificationoflineartimeinvariantsystemsispresentedinthispaper. InlightoftheGabortheoryofsignaldecomposition. responsesofamulti-degree-of-freedomsystemcanbedecomposedintouncoupledsignals. vibratingatasinglenaturalfrequency. Giventheseuncoupledsignals, parameterestimationcanbesubse-quentlyconductedwithcommonmethods. Comparedwithtraditionalmethods, theproposedapproachrequiresnoinputsignalexceptforresponsesignalsgeneratedbyunknownenvironmentalexcitationandnomatterwhetheritisstationaryornot. Inthesenseoflessrestrictiononthein-outsignals,[link widoczny dla zalogowanych], 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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