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基于速度信号的大型结构模态参数识别ITD方法.docx

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基于速度信号的大型结构模态参数识别ITD方法 Title:ModalParameterIdentificationofLarge-ScaleStructuresusingITDMethodBasedonVelocitySignals Abstract: Modalparameteridentificationisafundamentaltaskinstructuralengineering,asitprovidescrucialinformationaboutthedynamicbehaviorofstructures.Inrecentyears,theuseofvelocitysignalsformodalparameteridentificationhasgainedsignificantattentionduetoitsadvantagesovertraditionalmethods.ThispaperpresentsanovelITD(ImprovedTransmissibilityDiagram)methodformodalparameteridentificationoflarge-scalestructuresbasedonvelocitysignals.Theproposedmethodaimstoovercomethelimitationsofexistingtechniquesandimprovetheaccuracyandefficiencyofmodalparameteridentification. 1.Introduction Large-scalestructures,suchasbridges,buildings,andoffshoreplatforms,arepronetodynamicexcitationscausedbyvariousforces.Understandingthedynamicbehaviorofthesestructuresisessentialfortheirdesign,evaluation,andmaintenance.Modalparameteridentification,includingnaturalfrequencies,modeshapes,anddampingratios,playsacrucialroleincharacterizingthedynamicresponseofstructures.Traditionalmethodsformodalparameteridentification,suchasthefrequencydomainanalysis,havesomelimitationswhenappliedtolarge-scalestructures.Therefore,thereisaneedtodevelopadvancedtechniquestoaddressthesechallenges. 2.ITDMethodOverview TheITDmethodisbasedontheTransmissibilityDiagram(TD),whichplotsthemagnitudeandphasedifferenceoftheresponsesattwodifferentlocationsonastructure.ByanalyzingtheTD,themodeshapesandnaturalfrequenciescanbeestimated.However,traditionalTDmethodsrelyonaccelerationsignals,whichoftensufferfromnoiseandmeasurementerrors.TheproposedITDmethodovercomestheselimitationsbyutilizingvelocitysignals,whicharemorereliableandaccurate. 3.ImplementationofITDMethod TheITDmethodconsistsofseveralsteps.First,thevelocitysignalsofthestructurearemeasuredusingsuitablesensors.Thesignalsarethenpreprocessedtoremovenoiseandoutliers.Next,theTDisconstructedbycalculatingthetransmissibility,whichrepresentstherelationshipbetweentheresponseattheexci