A multi-stage time synchronization method for structural health monitoring array

By employing a multi-stage time synchronization method, including preprocessing, coarse time synchronization, wave propagation constraint time synchronization, and precise time synchronization, the problem of poor time synchronization of sensor data was solved, achieving high-precision estimation of inter-story drift angles and improving the accuracy and reliability of the structural health monitoring system.

CN122172933APending Publication Date: 2026-06-09INST OF ENG MECHANICS CHINA EARTHQUAKE ADMINISTRATION
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF ENG MECHANICS CHINA EARTHQUAKE ADMINISTRATION
Filing Date
2026-01-30
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing technologies, the poor time synchronization of sensor data in structural health monitoring systems leads to large errors in the estimation of inter-story drift angles, especially when there is network congestion or communication interruption. Existing methods are difficult to achieve high-precision synchronization in real-world environments.

Method used

A multi-stage time synchronization method is adopted, including preprocessing, coarse time synchronization, wave propagation constraint time synchronization, and precise time synchronization. Time delay is gradually eliminated through cross-correlation, deconvolution, and cross-spectral phase calculation. The frequency range is limited to avoid the influence of high-frequency noise. Time delay is corrected by combining a multi-degree-of-freedom model and deconvolution method.

Benefits of technology

It significantly improves the accuracy of data-driven structural health monitoring systems, reducing arbitrary time delays to less than 10 milliseconds, ensuring accurate acquisition of the maximum inter-story drift angle, solving phase ambiguity and high-frequency noise interference problems, and enhancing the reliability of structural safety assessment.

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Abstract

This invention discloses a multi-stage time synchronization method for a structural health monitoring array, comprising: preprocessing a floor acceleration signal with unknown time delay; calculating the initial delay of the floor acceleration signal based on cross-correlation; calculating the residual time delay of the floor acceleration signal based on wave propagation constraints; calculating the residual time delay of the floor acceleration signal based on cross-spectral phase; reconstructing the synchronized floor acceleration signal using the initial delay, residual time delay, and residual time delay; calculating the displacement response through integration; and outputting the inter-story displacement. This invention divides the synchronization process into three sequential stages: the first stage rapidly reduces the large time delay to the order of several vibration periods; the second stage further refines the process, controlling the residual time delay within one period; and the third stage utilizes phase information to achieve high-precision synchronization while limiting the frequency range to avoid the influence of high-frequency noise.
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