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The use of Hurst exponent in impedance-based structural health monitoring

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Abstract

This work presents the use of the Hurst exponent in structural health monitoring based on the electromechanical impedance method. This technique uses piezoelectric patches bonded to the structure (or incorporated into) to measure impedance signatures. Any changes between the obtained curves may be related to the existence of damage in the monitored system. Damage metrics are calculated by proper equations used to quantify changes in impedance signatures, which present values very close to zero for undamaged structural condition (pristine) and increases as the damage become more evident. The Hurst exponent will be presented and discussed as a new damage metric to detect changes in impedance signatures due to the existence of damage, as an alternative to other damage metrics already consolidated in the literature. The effectiveness of Hurst exponent for damage detection is evaluated by using a set of experiments that were carried out on small aluminum beams, subjected to tests without and with the existence of damage for different environment temperatures. The damage analysis is performed by considering the comparison of the values obtained from Hurst exponent technique with the values from existing damage metrics. The results show that the Hurst exponent as a damage metric allows for the detection of the existence of damage in all test conditions. The results obtained demonstrate the advantages and disadvantages of the Hurst method in the context of the electromechanical impedance technique for structural health monitoring.

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Acknowledgements

The authors would like to thank Foz do Chapecó, Baesa, Enercan, and Ceran for technical and financial support, through the Research and Development project PD-02949-3007/2022—“Solução integrada para o diagnóstico de defeitos, análise dinâmica e monitoramento contínuo de unidades geradoras francis” with resources from ANEEL's R&D program. The authors also would like to thank Petrobras (2022/00119-7, 2022/00117-4, 2022/00024-6, 2019/00106-0, 2019/00056-2, and 2018/00082-0), CNPq, FAPEMIG, and CAPES (INCT-EIE) for the financial support of the present contribution. Special thanks to Fernanda Beatriz Aires de Freitas and Gabriel de Melo Alves Martins for their valuable help during the experimental tests of the present contribution.

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Authors and Affiliations

  1. LMEst – Structural Mechanics Laboratory, School of Mechanical Engineering, Federal University of Uberlandia, Av. João Naves de Ávila, 2121, Uberlândia, MG, 38408-100, Brazil

    Giuliano Gardolinski Venson, Karina Mayumi Tsuruta, Roberto Mendes Finzi Neto, Aldemir Ap Cavalini Jr & Valder Steffen Jr

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  1. Giuliano Gardolinski Venson
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  2. Karina Mayumi Tsuruta
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  3. Roberto Mendes Finzi Neto
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  4. Aldemir Ap Cavalini Jr
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  5. Valder Steffen Jr
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Correspondence to Aldemir Ap Cavalini Jr.

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Venson, G.G., Tsuruta, K.M., Finzi, R.M. et al. The use of Hurst exponent in impedance-based structural health monitoring. J Braz. Soc. Mech. Sci. Eng. 44, 536 (2022). https://doi.org/10.1007/s40430-022-03838-8

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