Data-based model free hysteresis identification for a nonlinear structure

Data-based model free hysteresis identification for a nonlinear structure

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时间:2019-08-04

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1、Data-basedmodelfreehysteresisidentificationf0ranonlinearstructureXuBin,HeJia,ZhouRen,MasriF.Sami(1.CollegeofCivilEngineering,HunanUniversity,Changsha410082,China;2.KeyLaboratoryofBuildingSafetyandEnergyEficiency(HunanUniversity),MinistryofEducation,Changsha410082,China;3.Departme

2、ntofCivilEngineering,UniversityofSouthernCalifornia,LosAngelesCA90089,USA)Abstract:Inthelasttwodecades,thedamagedetectionforcivilengineeringstructureshasbeenwidelytreatedasamo—dalanalysisproblemandmostofthecurrentlyavailablevibration—basedsystemidentificationapproachesarebasedonm

3、odalparameters,namelythenaturalfrequencies,modeshapesanddampingratios,and/ortheirderivations,whichalesuitableforlinearsystems.Nonlinearityisgenericinengineeringstructures.Forexample,theinitiationanddevel—opmentofcracksincivilengineeringstructuresastypicalstructuraldamagesarenonli

4、nearprocess.Oneofthemajorchallengesindamagedetection,earlywarninganddamageprognosisistoobtainreasonablyaccurateidentificationofnonlinearperformancesuchashysteresiswhichisthedirectindicatorofdamageinitiationanddevelopmentunderdy-namicexcitations.Inthisstudy,ageneraldata—basedident

5、ificationapproachforhystereticperformanceinformofnon-linearrestoringforceusingstructuraldynamicresponsesandcompleteandincompleteexcitationmeasurementtimeserieswasproposedandvalidatedwitha4-storyframestructureequippedwithsmartdevicesofmagneto—rheological(MR)dampertosimulatenonline

6、arperformance.Firstly,asanoptimizationmethod,theleast—squarestechniquewasem—ployedtoidentifythesystemmatricesofanequivalentlinearsystemofthenonlinearstructuremodelbasingontheexci-tationforceandthecorrespondingvibrationmeasurementswithimpacttestwhencompleteandincompleteexcitations

7、;andsecondly,thenonlinearrestoringforceofthestructurewasidentifiedandcomparedwiththetestmeasurementsfi—nally.Resultsshowthattheproposeddata—basedapproachiscapableofidentifyingthenonlinearbehaviorofen~neeringstructuresandcanbeemployedtoevaluatethedamageinitiationanddevelopmentofdi

8、ferentstructureunderdynamicloads.Kwords:

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