Cointegration for structural damage detection under environmental variabilities: An experimental study

Juan Carlos Burgos Diaz*, Bilal Ali Qadri, Martin Dalgaard Ulriksen

*Kontaktforfatter

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Abstrakt

An intricacy in vibration- based structural damage detection (VSDD) relates to environmental variabilities imposing limitations to the damage detectability. One method that has been put forth to resolve the issue is cointegration. Here, non-stationary vibration features are linearly combined into stationary residuals, which are then employed as damage indices under the assumption that the non-stationarity is governed by environmental variabilities. In the present paper, the feasibility of using cointegration to mitigate environmental variabilities while retaining sensitivity to damage is examined through an experimental study with a steel beam. A temperature-based environmental variability is introduced to the beam by use of heating cables, while damage is emulated by adding local mass perturbations. The vibration response of the beam in different environmental and structural states is captured and utilized as feature in a cointegration-based damage detection scheme. The performance of the scheme is assessed and compared to that of a scheme not accounting for the variability on the basis of the false positive ratio (FPR), the true positive ratio (TPR), and the area under the receiver operating characteristic curve (AUC). The results show that cointegration effectively mitigates the temperature variability and allows for an improved damage detectability compared to that of the scheme without a mitigation strategy.
OriginalsprogDansk
TitelDynamics of Civil Structures, Proceedings of the 39th IMAC, A Conference and Exposition on Structural Dynamics, 2021
Publikationsdato2021
StatusUdgivet - 2021
BegivenhedIMAC XXXIX, A Conference and Exposition on Structural Dynamics, 2021: Next Frontier in Structural Dynamics - Rozen Plaza Hotel, Orlando, USA
Varighed: 8 feb. 202111 feb. 2021
Konferencens nummer: 39
https://sem.org/imac

Konference

KonferenceIMAC XXXIX, A Conference and Exposition on Structural Dynamics, 2021
Nummer39
LokationRozen Plaza Hotel
Land/OmrådeUSA
ByOrlando
Periode08/02/202111/02/2021
Internetadresse

Emneord

  • Damage detection
  • Structural health monitoring
  • Cointegration
  • Experimental study
  • Environmental variabilities

Citationsformater