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Cross-spectrum-based synchronization of structural health monitoring data
Publikationstyp
Conference Paper
Date Issued
2022-07
Sprache
English
Institut
Citation
10th European Workshop on Structural Health Monitoring, (EWSHM 2022)
Contribution to Conference
Scopus ID
Synchronization discrepancies when measuring structural response may compromise the accuracy of information on the condition of structures, ex- tracted from structural health monitoring (SHM) systems. Loss of synchroniza- tion mostly concerns modern wireless SHM systems; however, synchronization discrepancies may also occur in cable-based systems in case multiple data ac- quisition units without global clock management are used. This paper presents the implementation and validation of a concept towards synchronizing SHM da- ta records containing structural response data, which is imperative for obtaining information valuable for accomplishing monitoring objectives. Specifically, the performance of a cross spectrum synchronization approach reported in a recent study, which builds upon cross spectral density phase angles of structural re- sponse data transformed into the frequency domain, is investigated with struc- tural response data from real structures. The cross spectrum synchronization approach is implemented into a wireless SHM system and into a cable-based SHM system, and it is validated through tests on a laboratory shear-frame struc- ture and through field tests on a pedestrian bridge, respectively. The validation test results prove that the cross spectrum synchronization approach is capable of complementing traditional clock synchronization protocols, thus enhancing the accuracy of SHM outcomes.