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Smart Structures and Systems Volume 7, Number 1, January 2011 , pages 59-82 DOI: https://doi.org/10.12989/sss.2011.7.1.059 |
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Output-only modal identification approach for time-unsynchronized signals from decentralized wireless sensor network for linear structural systems |
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Jae-Hyung Park, Jeong-Tae Kim and Jin-Hak Yi
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| 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. | ||
| Key Words | ||
| output-only modal identification; wireless sensor network; time-delayed signals; time-unsynchronization effect; complex mode shapes. | ||
| Address | ||
| Jae-Hyung Park: Department of Ocean Engineering, Pukyong National University, Busan, Korea Jeong-Tae Kim :Department of Ocean Engineering, Pukyong National University, Busan 608-737, Korea Jin-Hak Yi: Korea Ocean Research & Development Institute, Ansan, Korea | ||