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TLP-Supported NREL 5MW Floating Offshore Wind Turbine Tower Vibration Reduction Under Aligned and Misaligned Wind-Wave Excitations

Author

Listed:
  • Paweł Martynowicz

    (Department of Process Control, AGH University of Krakow, Mickiewicza 30 Ave., 30-059 Kraków, Poland)

  • Piotr Ślimak

    (Department of Process Control, AGH University of Krakow, Mickiewicza 30 Ave., 30-059 Kraków, Poland)

  • Georgios M. Katsaounis

    (School of Naval Architecture and Marine Engineering, National Technical University of Athens, 9, Iroon Polytechniou Str., 15772 Zografou, Greece)

Abstract

This paper presents a numerical study on the structural vibrations of a TLP-supported NREL 5MW wind turbine equipped with a tuned vibration absorber (TVA) in the nacelle. The analysis was focused on tower bending deflections and was conducted using a reference OpenFAST V3.5.3 dedicated wind turbine modelling software and a finite element simulation framework based on Comsol Multiphysics V6.3 which was newly developed for this study. The obtained four-degree-of-freedom (4-DOF) tower bending model was transferred using modal decomposition to the MATLAB/Simulink R2020b environment, where a 2-DOF TLP surge/sway model and a bidirectional (2-DOF) TVA model were embedded. The wind field was approximated by a Weibull distribution of velocities (8.86 m/s mean, 4.63 m/s standard deviation). It was combined with the wave actions simulated using a Bretschneider spectrum with a significant height of 2.5 m and a peak period of 8.1 s. The TVA model used was either the standard NREL reference 20-ton passive TVA, a 10-ton passive, or a 10-ton controlled TVA (the latter two tuned to the tower’s first bending mode). The controlled TVA utilised a magnetorheological (MR) damper, either operating independently (forming a semi-active MR-TVA) or simultaneously with a force actuator, forming, in this case, a hybrid H-MR-TVA. Both aligned and 45°/90° misaligned wind–wave excitations were examined to investigate the performance of a 10-ton real-time controlled (H-)MR-TVA operating with less working space. In aligned conditions, the semi-active and hybrid MR-TVA solutions demonstrated superior tower vibration mitigation, reducing maximum tower deflections by 11.2% compared to the reference TVA and by 14.9% with regard to the structure without TVA. The reduction in root-mean-square deflection reached up to 4.2%/2.9%, respectively, for the critical along-the-waves direction, while the TVA stroke reduction reached 18.6%. For misaligned excitations, the tower deflection was reduced by 4.3%/4.8% concerning the reference 20-ton TVA, while the stroke was reduced by 22.2%/34.4% (for 45°/90° misalignment, respectively). It is concluded that the implementation of the 10-ton real-time controlled (H-)MR-TVA is a promising alternative to the reference 20-ton passive TVA regarding tower deflection minimisation and TVA stroke reduction for the critical along-the-waves direction. The current research results may be used to design a full-scale semi-active or hybrid TVA system serving a TLP-supported floating offshore wind turbine structure.

Suggested Citation

  • Paweł Martynowicz & Piotr Ślimak & Georgios M. Katsaounis, 2025. "TLP-Supported NREL 5MW Floating Offshore Wind Turbine Tower Vibration Reduction Under Aligned and Misaligned Wind-Wave Excitations," Energies, MDPI, vol. 18(8), pages 1-33, April.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:8:p:2092-:d:1637422
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    References listed on IDEAS

    as
    1. Antonio Galán-Lavado & Matilde Santos, 2021. "Analysis of the Effects of the Location of Passive Control Devices on the Platform of a Floating Wind Turbine," Energies, MDPI, vol. 14(10), pages 1-19, May.
    2. Fitzgerald, Breiffni & McAuliffe, James & Baisthakur, Shubham & Sarkar, Saptarshi, 2023. "Enhancing the reliability of floating offshore wind turbine towers subjected to misaligned wind-wave loading using tuned mass damper inerters (TMDIs)," Renewable Energy, Elsevier, vol. 211(C), pages 522-538.
    3. Paweł Martynowicz & Georgios M. Katsaounis & Spyridon A. Mavrakos, 2024. "Comparison of Floating Offshore Wind Turbine Tower Deflection Mitigation Methods Using Nonlinear Optimal-Based Reduced-Stroke Tuned Vibration Absorber," Energies, MDPI, vol. 17(6), pages 1-30, March.
    4. Madsen, F.J. & Nielsen, T.R.L. & Kim, T. & Bredmose, H. & Pegalajar-Jurado, A. & Mikkelsen, R.F. & Lomholt, A.K. & Borg, M. & Mirzaei, M. & Shin, P., 2020. "Experimental analysis of the scaled DTU10MW TLP floating wind turbine with different control strategies," Renewable Energy, Elsevier, vol. 155(C), pages 330-346.
    5. Sajid Ali & Sang-Moon Lee & Choon-Man Jang, 2018. "Forecasting the Long-Term Wind Data via Measure-Correlate-Predict (MCP) Methods," Energies, MDPI, vol. 11(6), pages 1-17, June.
    6. Sajid Ali & Sang-Moon Lee & Choon-Man Jang, 2017. "Techno-Economic Assessment of Wind Energy Potential at Three Locations in South Korea Using Long-Term Measured Wind Data," Energies, MDPI, vol. 10(9), pages 1-24, September.
    7. Sajid Ali & Hongbae Park & Adnan Aslam Noon & Aamer Sharif & Daeyong Lee, 2024. "Accuracy Testing of Different Methods for Estimating Weibull Parameters of Wind Energy at Various Heights above Sea Level," Energies, MDPI, vol. 17(9), pages 1-19, May.
    8. Paweł Martynowicz, 2021. "Nonlinear Optimal-Based Vibration Control of a Wind Turbine Tower Using Hybrid vs. Magnetorheological Tuned Vibration Absorber," Energies, MDPI, vol. 14(16), pages 1-22, August.
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