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Journal of Shanghai University（Natural Science Edition）

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Identification of Modal Parameters of Multiple DegreeofFreedom 
System Based on HilbertHuang Transform

DUAN Xibo1,〓ZHANG Jiguang2,3,〓YAN Yong1   

  1. (1. Shandong Water Conservancy Polytechnic, Shandong 276826, China; 
    2. Rizhao Vocational College, Shandong 276826, China;
    3. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University,

    Shanghai 200072, China)

  • Received:2005-09-20 Revised:1900-01-01 Online:1900-01-01 Published:1900-01-01

Abstract:

For adaptively analyzing nonstationary and nonlinear signals, Hilber

t

Huang transform (HHT) has been developed recently. An HHT based method is prop

o

sed to identify modal frequency and damping ratio, in which the measured respons

e data polluted by noise are first decomposed into modal responses using empiric

al mode decomposition (EMD). HHT is then applied to each modal response to obtai

n the instantaneous amplitude and phase angle time histories. Linear leastsqua

r

e fitting is carried out to identify the natural frequency and damping ratio fro

m the instantaneous amplitude and phase angle for each modal response. Experimen

tal results show the validity of the algorithm. 

Key words: empirical mode decomposition, linear leastsquare fitting

, multiple degr

ee of freedom system,

HilbertHuang transform

CLC Number: