基于Hilbert_Huang变换与随机子空间识别的模态参数识别.pdf

30 1 V o.l 30 N o. 1 2010 2 JOURNAL OF EARTH QUAK E ENG IN EER ING AND ENG INEER ING V IBRAT ION Feb. 2010 : 1000 - 1301( 20 10) 01- 0053- 07 H ilbert- H uang 1, 2 1 1 韩建平 , 李达文 , 王飞行 ( 1 , 730050 2, 200092) : H ilber tHu ang H ilbert- H uang, H ilbert , , , , 12 , : H ilbert- H u ang : O 329 TU 3 11. 3 : A M odal param eter identification based on HilbertHuang transform and stochastic subspace identification 1, 2 1 1 HAN J ianp ing , L I D aw en , WANG F eix ing ( 1. Ins titu te of E arthqu ake P rotection and D isasterM it igation, L anzhou U n iv ersity of T echnology, L anzhou 730050, Ch ina 2. S tate K ey L aboratory of D isaster R edu ct ion in C iv il Engin eering, T ong ji U n iv ersity, Sh anghai 200092, Ch ina) Abstract: Tw o approaches are proposed for m odal p aram eter identificat ion of c iv il eng ineer ing structures b ased on H ilbertH uang transform ( HH T ) and stochastic subspace ident ification ( SSI) . T he first approach is b ased on HH T and natural excitation techn iqu e ( NExT ) . Emp irical m ode decom posit ion ( EMD) and H ilbert transform ( HT ) are used to extract the instantaneou s characteristics o f the orig inal signal. Then, NExT and b asic m odal analysis theory are applied to iden tify m odal param eters. T he second approach is b ased on EMD and SS I. Each sing le m oda l re spon se is