Effect of loading conditions on the natural frequency of offshore wind turbines using centrifuge model test
Effect of loading conditions on the natural frequency of offshore wind turbines using centrifuge model test
The vibration-based scour monitoring has received significant attention recently in Structural Health Monitoring (SHM). Specifically, natural frequency monitoring techniques for the Offshore Wind Turbines (OWTs) had successful application at European wind farm sites. However, it has been shown that the variation of natural frequency was influenced by factors other than scour, such as environmental conditions. To address this, we carried out centrifuge model tests on a reduced-scale 4.2 MW OWT model subjected to different loading conditions. For realistic application of the dynamic loading, the voltage signals were generated and sent to the piezoelectric actuator via amplifier to produce forced vibration loading. The time-series of the acceleration response were recorded at different heights. Then, the natural frequency of the system was identified using the SSI-COV algorithm. The results of this study confirmed that the natural frequency of the OWT could be obtained from vibrations measured during centrifuge testing using piezoelectric actuators and accelerometers. Furthermore, this approach suggests the potential to predict scour through observed changes in the natural frequency by incorporating soilstructure interaction.
Kyeong Sun Kim; Seung-Won Oh; Jun-Woo Kim; Sung-Ryul Kim
5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)
11 - Suction installed foundations and anchors
https://doi.org/10.53243/ISFOG2025-115
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