Field data observations for monitoring the impact of typhoon “In-fa” on dynamic performances of mono-pile offshore wind turbines: A novel systematic study

Liu, Fushun; Yu, Qianxiang; Li, Hongyou; Ye, Zhan; Zhou, Hu; Liu, Dianzi

doi:10.1016/j.marstruc.2023.103373

Cited by 6 publications

(1 citation statement)

References 31 publications

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“…Shan et al [13] showed that damping ratios can be more sensitive to measurement noise and sensor allocation than modal frequencies. Liu et al [14] analyzed acceleration and inclination sensors for the impact assessment of typhoon "In-fa" on the dynamic properties of monopile ofshore wind turbines. On top, SCADA (supervisory control and data acquisition) data have been recorded along with the sensor data in order to correlate the measurements with the parameters of the wind turbine such as wind speed, wind direction, turbine yaw angle, and turbine power output [12].…”

Section: Introductionmentioning

confidence: 99%

Microwave Structural Health Monitoring of the Grouted Connection of a Monopile-Based Offshore Wind Turbine: Fatigue Testing Using a Scaled Laboratory Demonstrator

Maetz,

Kappel,

Wiemann

et al. 2023

Structural Control and Health Monitoring

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Offshore wind turbines play a significant role in the expansion of clean and renewable energy. However, their exposure to harsh marine environments and dynamic loading conditions poses significant challenges to their structural integrity. In particular, the grouted connection, serving as the crucial interface between the monopile and the transition piece, is susceptible to cracking and particle washout that can lead to destabilizing grout erosion over time. In this paper, we propose a microwave structural health monitoring (SHM) approach for damage detection in grouted connections based on a stepped-frequency continuous wave radar. The methodology exploits ultra-wideband (UWB) electromagnetic wave propagation in the frequency range from 100 MHz to 2 GHz, where the microwaves propagate along the concrete-type dielectric material guided by the surrounding steel cylinders. For the proof of concept, a scaled laboratory demonstrator was built that realistically models the dynamic loading experienced by a full-scale monopile. The structure was equipped with an UWB radar system using two transmitting and three receiving antennas directly coupled to the grout. For validation, a large number of other sensors, i.e., accelerometers, strain gauges, and acoustic emission sensors have also been installed and measured synchronously during the fatigue test. It is demonstrated here that the proposed SHM methodology offers a nondestructive and real-time method for assessing the structural integrity of the grouted connection directly, actively, and automatically. This has the potential to support predictive maintenance activities in the future.

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Section: Introductionmentioning

confidence: 99%