基于两阶段稳定图的随机子空间识别结构模态参数-地震工程与工程振动.pdfVIP

2 8 3 V o.l 2 8 N o. 3 2008 6 JOURNAL OF EARTH QUAKE ENG IN EER ING AND ENG INEER ING V IBRAT ION Jun. 200 8 : 2008) 1, 2 2 2 常 军 , 孙利民, 张启伟 ( 1. , 2 15011 2. , 200092) : , , , , , , , , , : : U 441 : A Study on th e m ethod for stochastic subspace iden tifying structural m odal param eters based on twostage stab ilization diagram 1, 2 2 2 CHAN G Jun , SUN L im in , ZHANG Q iw ei ( 1. Col lege of C iv il Eng ineering, U n iv ersity of S cience and T echno logy of Suzhou, Suzh ou 2 150 11, Ch ina 2. S tate K ey L aboratory for D isaster R eduction in C iv il Eng ineering, T ongji U n ivers ity, Shangh ai 200092, C h ina) Abs tract: V ibrationbased stru ctural hea lth m on itoring usua lly needs to ex tract the v ibrat ion characterist ics from op erational vibration m easurem en ts. Stoch astic sub sp ace ident ification is a nove l approach develop ed recent years. It can ident ify m odal param eters o f linear stru cture from am bient v ibration of structure. T he key issu e in stochastic subspace ident ification is to ga in the order o f the system. Stabilization d iagram is a novel approach to decide the or der of the system. But stoch astic sub sp ace ident ification m ay yie ld fa lse m ode.l T his is the m ain shortcom ing of th is m ethod. T his p aper presents a m ethod for tw ostage stab ilization d iagram based stoch astic subspace identi