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An Approach for Time Synchronization of Wireless Accelerometer Sensors Using Frequency-Squeezing-Based Operational
Yi Chen1, Xiaoqing Zheng2, Yaozhi Luo1
1College of Civil and Architecture Engineering, Zhejiang University, Hangzhou 310058, China.
Sensors (Basel, Switzerland)
|July 9, 2022
Summary
This study introduces a novel time synchronization method for wireless sensors to correct asynchronous data. The approach ensures accurate structural modal identification by resolving time delays in dynamic responses.
Area of Science:
- Structural Health Monitoring
- Signal Processing
- Wireless Sensor Networks
Background:
- Wireless sensor networks (WSNs) face time synchronization challenges impacting data accuracy.
- Environmental factors and clock issues cause time delays in sensor data.
- Inaccurate synchronization leads to misestimation of modal parameters in structural analysis.
Purpose of the Study:
- To propose a robust time synchronization approach for WSNs.
- To address the issue of asynchronous dynamic responses in structural monitoring.
- To improve the accuracy of structural modal identification.
Main Methods:
- Frequency Domain Decomposition (FDD) combined with Frequency-Squeezing Processing (FSP).
- Utilizing the relationship between modal phase angles from the singular value spectrum.
- Estimating and correcting time lags between wireless sensors.
Main Results:
- Successfully detected and corrected asynchronous dynamic responses.
- Demonstrated effectiveness through numerical simulations, experimental tests, and field measurements.
- Validated the approach on a large-span spatial structure.
Conclusions:
- The proposed FDD-FSP method effectively achieves time synchronization for wireless accelerometer sensors.
- Accurate time synchronization is crucial for reliable structural modal identification.
- This technique enhances the integrity of data from WSNs in structural health monitoring.
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