Output-only Modal Analysis Approach for Time-Unsynchronization Signals in Wireless Sensor Network

摘要

In this study, an output-only modal analysis approach for wireless sensor nodes is proposed on the basis of assumption that a target structure is a linear system. In order to achieve the objective, the following approaches are implemented. Firstly, an output-only modal analysis method is selected for the wireless sensor networks. Secondly, the effect of time-unsynchronization on the modal analysis method is mathematically derived. Thirdly, a new modal analysis approach using complex mode-shapes is proposed to extract modal parameters from unsynchronized signals. Finally, the proposed approach is evaluated by numerical tests and experimental tests.