Record Details

Modal Parameter Estimation of Tall Structures using HHT with Improved EMD

NOPR - NISCAIR Online Periodicals Repository

View Archive Info
 
 
Field Value
 
Title Modal Parameter Estimation of Tall Structures using HHT with Improved EMD
 
Creator Lakshmi, K
Reddy, Varun Kasi
Rao, A Rama Mohan
 
Subject GNTV tower
Modal identification
Non-stationary ambient response
Time-frequency analysis
 
Description 594-605
In this paper, identification of the natural frequencies, damping ratios and mode shapes of the structures using the
measured ambient responses are proposed using time-frequency analysis. The impulse responses are obtained from the
measured acceleration time history data through cross-correlations. Empirical Mode Decomposition (EMD) is employed on
these generated impulse responses to obtain Intrinsic Mode Functions (IMFs). Finally, modal identification of the structure
is carried out by performing Hilbert Transform (HT) on these generated IMFs. To avoid the problem of mode mixing during
EMD of the signal, an improved version with intermittency criteria along with treatment to end effects during sifting is
proposed in this paper. Experimentally measured data of Guangzhou New TV (GNTV) Tower is used to test and verify the
proposed algorithm. The studies indicate that the proposed HHT based algorithm can be applied quite effectively for the
modal identification of practical engineering structures.
 
Date 2022-06-06T07:27:17Z
2022-06-06T07:27:17Z
2022-06
 
Type Article
 
Identifier 0975-1084 (Online); 0022-4456 (Print)
http://nopr.niscpr.res.in/handle/123456789/59859
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source JSIR Vol.81(06) [June 2022]