NDLI: Output only modal identification and structural damage detection using time frequency & wavelet techniques

Content Provider	Springer Nature Link
Author	Nagarajaiah, S. Basu, B.
Copyright Year	2009
Abstract	The primary objective of this paper is to develop output only modal identification and structural damage detection. Identification of multi-degree of freedom (MDOF) linear time invariant (LTI) and linear time variant (LTV—due to damage) systems based on Time-frequency (TF) techniques—such as short-time Fourier transform (STFT), empirical mode decomposition (EMD), and wavelets—is proposed. STFT, EMD, and wavelet methods developed to date are reviewed in detail. In addition a Hilbert transform (HT) approach to determine frequency and damping is also presented. In this paper, STFT, EMD, HT and wavelet techniques are developed for decomposition of free vibration response of MDOF systems into their modal components. Once the modal components are obtained, each one is processed using Hilbert transform to obtain the modal frequency and damping ratios. In addition, the ratio of modal components at different degrees of freedom facilitate determination of mode shape. In cases with output only modal identification using ambient/random response, the random decrement technique is used to obtain free vibration response. The advantage of TF techniques is that they are signal based; hence, can be used for output only modal identification. A three degree of freedom 1:10 scale model test structure is used to validate the proposed output only modal identification techniques based on STFT, EMD, HT, wavelets. Both measured free vibration and forced vibration (white noise) response are considered. The secondary objective of this paper is to show the relative ease with which the TF techniques can be used for modal identification and their potential for real world applications where output only identification is essential. Recorded ambient vibration data processed using techniques such as the random decrement technique can be used to obtain the free vibration response, so that further processing using TF based modal identification can be performed.
Starting Page	583
Ending Page	605
Page Count	23
File Format	PDF
ISSN	16713664
Journal	Earthquake Engineering and Engineering Vibration
Volume Number	8
Issue Number	4
e-ISSN	1993503X
Language	English
Publisher	Institute of Engineering Mechanics, China Earthquake Administration
Publisher Date	2010-01-20
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Time-frequency methods short time Fourier transform Hilbert transform wavelets modal identification output only structural health monitoring damage detection Vibration, Dynamical Systems, Control Civil Engineering Geotechnical Engineering
Content Type	Text
Resource Type	Article
Subject	Building and Construction Geophysics Mechanical Engineering Geotechnical Engineering and Engineering Geology Civil and Structural Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Output-only identification of the modal and physical properties of structures using free vibration response

Structural modal parameter identification and damage diagnosis based on Hilbert-Huang transform

Recording-based identification of site liquefaction

Output only modal identifi cation and structural damage detection using time frequency & wavelet techniques.

Effects of excitation frequency on detection accuracy of orthogonal wavelet decomposition for structural health monitoring

A technique to improve the empirical mode decomposition in the Hilbert-Huang transform

An operational modal analysis method in frequency and spatial domain

Output only modal identification and structural damage detection using time frequency & wavelet techniques

Damage detection on framed structures: modal curvature evaluation using Stockwell Transform under seismic excitation

Output only modal identification and structural damage detection using time frequency & wavelet techniques

Similar Documents

Output-only identification of the modal and physical properties of structures using free vibration response

Structural modal parameter identification and damage diagnosis based on Hilbert-Huang transform

Recording-based identification of site liquefaction

Output only modal identifi cation and structural damage detection using time frequency & wavelet techniques.

Effects of excitation frequency on detection accuracy of orthogonal wavelet decomposition for structural health monitoring

A technique to improve the empirical mode decomposition in the Hilbert-Huang transform

An operational modal analysis method in frequency and spatial domain

Output only modal identification and structural damage detection using time frequency & wavelet techniques

Damage detection on framed structures: modal curvature evaluation using Stockwell Transform under seismic excitation

Output only modal identification and structural damage detection using time frequency & wavelet techniques