Feasibility of Output-Only Modal Identification Using Wireless Sensor Network: A Quantitative Field Experimental Study

Abstract

Although significant advancements have been achieved in wireless sensor network (WSN) in the past decades, there is still a strong need for in-depth analysis on wireless time synchronization and data quality during field testing. In this paper, an academic WSN is adopted for output-only modal identification of two full-scale bridges in Xiamen, China. This paper first assesses the accuracy of time synchronization performed by the WSN through a centralized beacon signal and then studies wireless data quality using two quantitative performance indexes. The relationship between vibration amplitude and quality of wireless sensor data is investigated. With ambient bridge accelerations acquired by wireless sensing units, modal properties of the two bridges are identified using the stochastic subspace identification (SSI) method and the enhanced frequency domain decomposition (EFDD) method. Accuracies of the modal identification results are evaluated through comparison with modal properties identified from tethered sensing data. The comparison shows close match in natural frequencies and mode shapes, although relatively large difference in damping ratios exists between results from wireless and tethered sensing data. An overall close match between the wireless and tethered results demonstrates the feasibility of using WSN for the ambient vibration testing of full-scale bridges.

Parametric system identification of large‐scale structure using decoupled synchronized signals

“…[36] Shen et al applied the normalized cross-correlation function between tethered and wireless sensor data to estimate the relative time lag between them. [37] Bernal assumed the phases of the fundamental mode of structures are identically zero and to synch outputs, he used the time shifts that are needed to modify fundamental mode phase to zero. [38] Zhou et al showed this assumption that the fundamental mode had zero phases is not always correct and suggested a way to find the mode with zero phases beforehand.…”