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Structural health monitoring of grouted connections for offshore wind turbines by means of acoustic emission: An experimental study

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  • Tziavos, Nikolaos I.
  • Hemida, H.
  • Dirar, S.
  • Papaelias, M.
  • Metje, N.
  • Baniotopoulos, C.

Abstract

Grouted connections for offshore wind turbines are formed by attaching overlapping steel piles with an ultra-high strength cementitious grout. The structural performance of grouted connections is critical for the substructures in order to exhibit sufficient resistance to environmental loads. The long-term integrity of the grout core can be compromised due to the complex stress states present, leading to unexpected slippage and gaps in the steel-grout interface, grout cracking and water ingress. This paper presents the results of an experimental investigation on damage evolution and failure mechanisms occurring within grouted connections in laboratory-based bending tests using acoustic emission. A parametric analysis of the detected acoustic emission signals has been conducted. The acoustic emission activity has been correlated with load-displacement measurements and the observed specimen failure modes. For the tested grouted connections, the number of acoustic emission hits and the signal duration were employed to identify damage evolution during load application. Root mean square and the ratio of rise time to amplitude were found to be useful Key Performance Indicators (KPIs) for damage prognosis. Finally, an improved b-value analysis has been performed, and the computed drops were well-associated with grout cracking within the connection.

Suggested Citation

  • Tziavos, Nikolaos I. & Hemida, H. & Dirar, S. & Papaelias, M. & Metje, N. & Baniotopoulos, C., 2020. "Structural health monitoring of grouted connections for offshore wind turbines by means of acoustic emission: An experimental study," Renewable Energy, Elsevier, vol. 147(P1), pages 130-140.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:130-140
    DOI: 10.1016/j.renene.2019.08.114
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    References listed on IDEAS

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    1. Artigao, Estefania & Martín-Martínez, Sergio & Honrubia-Escribano, Andrés & Gómez-Lázaro, Emilio, 2018. "Wind turbine reliability: A comprehensive review towards effective condition monitoring development," Applied Energy, Elsevier, vol. 228(C), pages 1569-1583.
    2. Márquez, Fausto Pedro García & Pérez, Jesús María Pinar & Marugán, Alberto Pliego & Papaelias, Mayorkinos, 2016. "Identification of critical components of wind turbines using FTA over the time," Renewable Energy, Elsevier, vol. 87(P2), pages 869-883.
    3. Yang, Wenxian & Court, Richard & Jiang, Jiesheng, 2013. "Wind turbine condition monitoring by the approach of SCADA data analysis," Renewable Energy, Elsevier, vol. 53(C), pages 365-376.
    4. Martinez-Luengo, Maria & Kolios, Athanasios & Wang, Lin, 2016. "Structural health monitoring of offshore wind turbines: A review through the Statistical Pattern Recognition Paradigm," Renewable and Sustainable Energy Reviews, Elsevier, vol. 64(C), pages 91-105.
    5. García Márquez, Fausto Pedro & Tobias, Andrew Mark & Pinar Pérez, Jesús María & Papaelias, Mayorkinos, 2012. "Condition monitoring of wind turbines: Techniques and methods," Renewable Energy, Elsevier, vol. 46(C), pages 169-178.
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    Cited by:

    1. Guo, Yaohua & Zhang, Puyang & Ding, Hongyan & Le, Conghuan, 2021. "Design and verification of the loading system and boundary conditions for wind turbine foundation model experiment," Renewable Energy, Elsevier, vol. 172(C), pages 16-33.
    2. Liu, Y. & Hajj, M. & Bao, Y., 2022. "Review of robot-based damage assessment for offshore wind turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 158(C).
    3. Yu Hu & Jian Yang & Charalampos Baniotopoulos, 2020. "Repowering Steel Tubular Wind Turbine Towers Enhancing them by Internal Stiffening Rings," Energies, MDPI, vol. 13(7), pages 1-23, March.

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