Long-term vibration-based monitoring and seismic performance assessment of a wind turbine
- PDF / 2,121,233 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 103 Downloads / 203 Views
ORIGINAL PAPER
Long‑term vibration‑based monitoring and seismic performance assessment of a wind turbine Serdar Soyoz1 · Serap Hanbay1 · Burak Bagirgan1 · Ozgun Ergun1 Received: 9 May 2020 / Revised: 18 September 2020 / Accepted: 28 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this study, long-term vibration-based monitoring of a 900-kW onshore wind turbine is presented. Modal properties such as frequency, shape, and damping ratios were obtained using enhanced frequency domain decomposition method. Change in modal parameters due to environmental and operational conditions was determined. Modal parameters after cleansing such effects were obtained by multiple linear regression analyses. Then, finite element model of the wind turbine was developed including piles and soil springs; and updated using identified modal parameters. After all, seismic fragility curves of the structure with the limit state being local buckling were developed considering different levels of wind speed. Stress level at which local buckling occurs was determined by pushover analysis of the turbine using a nonlinear finite element model. In the context of this study, it was observed that identified modal values had significant scattering and level of wind speed significantly changed the seismic fragility curve of the wind turbine. Keywords Wind turbine · Long-term monitoring · Operational effects · Seismic fragility
1 Introduction Wind energy is a type of widespread renewable energy all around the world, and many countries make more investment in wind energy. Therefore, structural health monitoring and seismic performance assessment of wind turbines have become a vital issue due to safety and economic concerns. Recent studies on vibration-based monitoring of wind turbine towers are summarized in the following lines. Hansen et al. [1], estimated modal values of a 2.75 MW wind turbine under operational conditions. Similarly, a long term monitoring of an offshore 5 MW wind turbine to obtain modal parameters of the support structure under parked conditions was presented [2]. In a different study, in addition to monitoring campaign of a 2 MW wind; numerical model developed in ANSYS was explained. SCADA system was also used and root-mean-squared values of the collected acceleration data together with the SCADA data were related to the non-operating and operating turbine [3]. Oliveira et al. [4], presented continuous monitoring of a 2 MW wind turbine * Serdar Soyoz [email protected] 1
Department of Civil Engineering, Bogazici University, Istanbul, Turkey
under operational conditions. The variability of the dynamic properties of the turbine was shown and modal damping values were obtained using identified shut-down events. Wind turbines are exposed to environmental and operational factors, and evaluation of these factors is important to find a band range of change in modal parameters. In this way, any change in modal parameters can be related to damage or operational and environmental conditi
Data Loading...
