Effects of wireless sensor network uncertainties on output-only modal analysis employing merged data of multiple tests

Nguyen, Theanh, Chan, Tommy H.T., & Thambiratnam, David (2012) Effects of wireless sensor network uncertainties on output-only modal analysis employing merged data of multiple tests. In Teng, J.G., Dai, J.G., Law, S.S., Xia, Y, & Zhu, S.Y. (Eds.) Proceedings of the First International Conference on Performance-based and Lifestyle Structural Engineering, Faculty of Construction and Environment & Research Institute for Sustainable Urban Development, The Hong Kong Polytechnic University, Hong Kong, pp. 1148-1155.

View at publisher


The use of Wireless Sensor Networks (WSNs) for Structural Health Monitoring (SHM) has become a promising approach due to many advantages such as low cost, fast and flexible deployment. However, inherent technical issues such as data synchronization error and data loss have prevented these distinct systems from being extensively used. Recently, several SHM-oriented WSNs have been proposed and believed to be able to overcome a large number of technical uncertainties. Nevertheless, there is limited research verifying the applicability of those WSNs with respect to demanding SHM applications like modal analysis and damage identification. This paper first presents a brief review of the most inherent uncertainties of the SHM-oriented WSN platforms and then investigates their effects on outcomes and performance of the most robust Output-only Modal Analysis (OMA) techniques when employing merged data from multiple tests. The two OMA families selected for this investigation are Frequency Domain Decomposition (FDD) and Data-driven Stochastic Subspace Identification (SSI-data) due to the fact that they both have been widely applied in the past decade. Experimental accelerations collected by a wired sensory system on a large-scale laboratory bridge model are initially used as clean data before being contaminated by different data pollutants in sequential manner to simulate practical SHM-oriented WSN uncertainties. The results of this study show the robustness of FDD and the precautions needed for SSI-data family when dealing with SHM-WSN uncertainties. Finally, the use of the measurement channel projection for the time-domain OMA techniques and the preferred combination of the OMA techniques to cope with the SHM-WSN uncertainties is recommended.

Impact and interest:

4 citations in Web of Science®
Search Google Scholar™

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

151 since deposited on 04 Apr 2013
24 in the past twelve months

Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 58878
Item Type: Conference Paper
Refereed: Yes
Additional Information: A USB drive containing manuscripts of all accepted papers, plus a print volume containing abstracts of keynote and invited lectures as well as all other papers will be published.
Keywords: Wireless Sensor Networks (WSNs), Structural Health Monitoring (SHM), Uncertainties, Generic, SHM-oriented WSNs, Output-only Modal Analysis (OMA)
ISBN: 978-988-15439-3-6
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 please consult the authors
Deposited On: 04 Apr 2013 04:34
Last Modified: 21 Jan 2016 05:07

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page