基于模型参考自适应算法的非线性结构损伤识别
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摘要
许多工程结构在遭受飓风、地震之类的动荷载时,存在迟滞非线性现象,因此,对其结构参数进行实时辨识显得尤为必要。针对迟滞非线性结构的力学性质,采用一种基于模型参考自适应算法的参数辨识方法。该方法能够追踪时变的参数,检测损伤,包括损伤的大小和位置,以及损伤发生的时刻。数值仿真的结果表明,该方法对参数变化具有敏感性,非线性结构的仿真结果证实了该方法能够有效检测结构的损伤。
System identification and damage detection have received considerable attention recently because of their importance in structural health monitoring.Many civil engineering structures exhibit hysteretic behaviors when subject to severe dynamic loads,such as strong earthquakes.Adaptive estimation methods are needed for on-line identification of non-linear hysteretic structural systems under dynamic excitations.Recently,techniques for parametric estimation and damage evaluation have been proposed in the literatures;however,the on-line identification of non-linear structures is still a challenge.In this paper,we present a parametric identification method for non-linear hysteretic systems based on recursive model reference(RMR) adaptive algorithm.The method presented has the capability of tracking the time-varying parameters and detecting the damages,including the damage location and severity.Numerical simulations show that the method presented is sensitive to the parametric variations.Simulation results for non-linear hysteretic structures demonstrate that the technique presented is effective in detecting the structural damage.
System identification and damage detection have received considerable attention recently because of their importance in structural health monitoring.Many civil engineering structures exhibit hysteretic behaviors when subject to severe dynamic loads,such as strong earthquakes.Adaptive estimation methods are needed for on-line identification of non-linear hysteretic structural systems under dynamic excitations.Recently,techniques for parametric estimation and damage evaluation have been proposed in the literatures;however,the on-line identification of non-linear structures is still a challenge.In this paper,we present a parametric identification method for non-linear hysteretic systems based on recursive model reference(RMR) adaptive algorithm.The method presented has the capability of tracking the time-varying parameters and detecting the damages,including the damage location and severity.Numerical simulations show that the method presented is sensitive to the parametric variations.Simulation results for non-linear hysteretic structures demonstrate that the technique presented is effective in detecting the structural damage.
引文
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[2]A lv in K F,R obertson A N,R e ich G W,et a l.S tructura l system iden tification:from rea lity tom ode ls[J].Com pu t.S truct.,2003,81:1 149—1 176.
[3]Chang F K(Ed.).S tructura l hea lth m on itoring[A].P roceed ings of the F irst,Second and T h irdIn ternationa l W orkshop on S tructura l H ea lthM on itoring[C].S tan ford U n ivers ity,S tan ford,CA,CRC P ress,1997,1999,2001.
[4]Loh C H,T ou I C.A system iden tification approachto the detection of changes in both linear andnon linear structura l param eters[J].J.E arthquakeEng.S truct.D yn.,1995,24:85—97.
[5]Loh C H,L in C Y,Huang C C.T im e dom a iniden tification of fram es under earthquake load ings[J].A SCE,J.Eng.M ech.,2000,126(7):693—703.
[6]Sm yth A W,M asri S F,Chass iakos A G,et a l.O n line param etric iden tification of M DOF non linearhysteretic system s[J].A SCE J.Eng.M ech.,1999,125:133—142.
[7]L in J W,R a im ondo B,Sm yth A W,et a l.O n-lineiden tification of non linear hysteretic structura lsystem s us ing a variab le trace approach[J].J.E arthquake Eng.S truct.D yn.,2001,30:1 279—1303.
[8]Y ang J N,L in S ilian.O n-line iden tification of non-linear hysteretic structures us ing an adaptive track ingtechn ique[J].In ternationa l Journa l of N on-L inearM echan ics,2004,39(9):1 481—1 491.
[9]Y ang J N,L in S ilian.Iden tification of param etricvariations of structures based on least squaresestim ation and adaptive track ing techn ique[J].A SCE,J.Engrg.M ech.,2005,131(3):290—298.
[10]Y ang J N,Pan S,L in S.T rack ing of structura ldam age based on ex tended K a lm an filter w ithunknow n inpu ts[A].P roceed ings of the U S-koreaJo in t Sem inar/W orkshop on Sm art S tructuresT echno log ies[C].Seou l,K orea,2004,d:325—334.
[11]L i S J,Suzuk i Y,N oor M.Im provem en t ofparam eter estim ation for non-linear hysteretic system sw ith slip by a fast B ayes ian bootstrap filter[J].In ternationa l Journa l of N on-L inearM echan ics,2004,39(9):1 435—1 445.
[12]Zhou L,Y an G.HHT m ethod for systemiden tification and dam age detection:an experim en tstudy[J].Sm art S tructures and System,2006,2(2):141—154.
[13]L andau I D.A survey of m ode l reference adaptivetechn ique—theory and app lications[J].A u tom atica,1974,10:353—379.
[14]L andau I D.A daptive Con tro—lT he M ode l R eferenceA pproach[M].N ew Y ork:M arce l D ekker,1979.
[15]L andau I D.Com b in ing m ode l reference adaptivecon tro llers and stochastic se lf-tun ing regu lators[J].A u tom atica,1982,18(1):77—84.
[16]Y in Q,Zhou L.N on linear structura l iden tificationus ing a recurs ive m ode l reference adaptive a lgorithm[A].P roceed ings of the 5th In ternationa lW orkshopon S tructura l H ea lth M on itoring[C].S tan ford,CA,2005,1 007—1 016.
[17]Sohe il Saadat,M ohamm ad N N oori,G regory DBuckner,et a l.S tructura l hea lth m on itoring anddam age detection us ing an in te lligen t param etervary ing(IPV)techn ique[J].In ternationa l Journa l ofN on linearM echan ics,2004,39(10):1 687—1 697.
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