Output-only modal identification approach for time-unsynchronized signals from decentralized wireless sensor network for linear structural systems SCIE SCOPUS KCI OTHER

Cited 8 time in WEB OF SCIENCE Cited 8 time in Scopus
Title
Output-only modal identification approach for time-unsynchronized signals from decentralized wireless sensor network for linear structural systems
Author(s)
Park, Jae-Hyung; Kim, Jeong-Tae; Yi, Jin-Hak
KIOST Author(s)
Yi, Jin-Hak(이진학)
Publication Year
2011-01
Abstract
In this study, an output-only modal identification approach is proposed for decentralized wireless sensor nodes used for linear structural systems. The following approaches are implemented to achieve the objective. Firstly, an output-only modal identification method is selected for decentralized wireless sensor networks. Secondly, the effect of time-unsynchronization is assessed with respect to the accuracy of modal identification analysis. Time-unsynchronized signals are analytically examined to quantify uncertainties and their corresponding errors in modal identification results. Thirdly, a modified approach using complex mode shapes is proposed to reduce the unsynchronization-induced errors in modal identification. In the new way, complex mode shapes are extracted from unsynchronized signals to deal both with modal amplitudes and with phase angles. Finally, the feasibility of the proposed approach is evaluated from numerical and experimental tests by comparing with the performance of existing approach using real mode shapes.
ISSN
1738-1584
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3892
DOI
10.12989/sss.2011.7.1.059
Bibliographic Citation
SMART STRUCTURES AND SYSTEMS, v.7, no.1, pp.59 - 82, 2011
Publisher
TECHNO-PRESS
Subject
MONITORING SYSTEMS; DAMAGE DETECTION; SMART SENSORS
Keywords
output-only modal identification; wireless sensor network; time-delayed signals; time-unsynchronization effect; complex mode shapes
Type
Article
Language
English
Document Type
Article
Publisher
TECHNO-PRESS
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