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System identification and finite element model updating of a 6 MW offshore wind turbine using vibrational response measurements

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  • Moynihan, Bridget
  • Mehrjoo, Azin
  • Moaveni, Babak
  • McAdam, Ross
  • Rüdinger, Finn
  • Hines, Eric

Abstract

Offshore wind energy is playing an increasingly vital role in the clean energy transition around the world, and improved reliability of wind turbine structures is necessary for the long-term success and efficiency of renewable energy. Increased reliability would reduce costs associated with maintenance due to breakages and in turn reduce the levelized cost of energy for offshore wind energy sources. Structural health monitoring methods can be used to predict breakages and extend lifetimes by continuously monitoring instrumented structures. This paper presents system identification and model updating of a 6 MW offshore wind turbine using vibration measurements under varying operational conditions. The turbine is monopile-supported and instrumented with strain gauges and accelerometers at several elevations along the tower and monopile. Effective stiffness of soil springs in the model are updated to match modal-predicted natural frequencies and mode shapes of the first two modes with those identified from measurements at different operating conditions. A deterministic and probabilistic (Bayesian) approach to model updating are compared. The sensitivity of identified modal parameters and the updated model parameters are investigated with respect to operational and environmental conditions such as wind speed. Results show that deterministic model updating can match modal parameters with high accuracy across datasets and environmental conditions. Bayesian model updating results successfully estimate the posterior distribution of updating model parameters with an increasing degree of certainty as more data is used.

Suggested Citation

  • Moynihan, Bridget & Mehrjoo, Azin & Moaveni, Babak & McAdam, Ross & Rüdinger, Finn & Hines, Eric, 2023. "System identification and finite element model updating of a 6 MW offshore wind turbine using vibrational response measurements," Renewable Energy, Elsevier, vol. 219(P1).
    • Handle: RePEc:eee:renene:v:219:y:2023:i:p1:s0960148123013459
    DOI: 10.1016/j.renene.2023.119430
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    References listed on IDEAS

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    1. Eleonora M. Tronci & Maurizio Angelis & Raimondo Betti & Vittorio Altomare, 2020. "Semi-Automated Operational Modal Analysis Methodology to Optimize Modal Parameter Estimation," Journal of Optimization Theory and Applications, Springer, vol. 187(3), pages 842-854, December.
    2. Hines, Eric M. & Baxter, Christopher D.P. & Ciochetto, David & Song, Mingming & Sparrevik, Per & Meland, Henrik J. & Strout, James M. & Bradshaw, Aaron & Hu, Sau-Lon & Basurto, Jorge R. & Moaveni, Bab, 2023. "Structural instrumentation and monitoring of the Block Island Offshore Wind Farm," Renewable Energy, Elsevier, vol. 202(C), pages 1032-1045.
    3. Liu, Xiong & Lu, Cheng & Li, Gangqiang & Godbole, Ajit & Chen, Yan, 2017. "Effects of aerodynamic damping on the tower load of offshore horizontal axis wind turbines," Applied Energy, Elsevier, vol. 204(C), pages 1101-1114.
    4. Cong, Shuai & James Hu, Sau-Lon & Li, Hua-Jun, 2022. "Using incomplete complex modes for model updating of monopiled offshore wind turbines," Renewable Energy, Elsevier, vol. 181(C), pages 522-534.
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    Cited by:

    1. Moynihan, Bridget & Tronci, Eleonora M. & Hughes, Michael C. & Moaveni, Babak & Hines, Eric, 2024. "Virtual sensing via Gaussian Process for bending moment response prediction of an offshore wind turbine using SCADA data," Renewable Energy, Elsevier, vol. 227(C).

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