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Smart Structures and Systems Volume 13, Number 2, February 2014 , pages 177-201 DOI: https://doi.org/10.12989/sss.2014.13.2.177 |
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A frequency tracking semi-active algorithm for control of edgewise vibrations in wind turbine blades |
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John Arrigan, Chaojun Huang, Andrea Staino, Biswajit Basu and Satish Nagarajaiah
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| Abstract | ||
| With the increased size and flexibility of the tower and blades, structural vibrations are becoming a limiting factor towards the design of even larger and more powerful wind turbines. Research into the use of vibration mitigation devices in the turbine tower has been carried out but the use of dampers in the blades has yet to be investigated in detail. Mitigating vibrations will increase the design life and hence economic viability of the turbine blades and allow for continual operation with decreased downtime. The aim of this paper is to investigate the effectiveness of Semi-Active Tuned Mass Dampers (STMDs) in reducing the edgewise vibrations in the turbine blades. A frequency tracking algorithm based on the Short Time Fourier Transform (STFT) technique is used to tune the damper. A theoretical model has been developed to capture the dynamic behaviour of the blades including the coupling with the tower to accurately model the dynamics of the entire turbine structure. The resulting model consists of time dependent equations of motion and negative damping terms due to the coupling present in the system. The performances of the STMDs based vibration controller have been tested under different loading and operating conditions. Numerical analysis has shown that variation in certain parameters of the system, along with the time varying nature of the system matrices has led to the need for STMDs to allow for real-time tuning to the resonant frequencies of the system. | ||
| Key Words | ||
| structural control; vibration; semi-active control; damping; wind energy | ||
| Address | ||
| John Arrigan, Andrea Staino and Biswajit Basu : Department of Civil, Structural and Environmental Engineering, Trinity College Dublin, Ireland Chaojun Huang and Satish Nagarajaiah : Department of Civil and Env. Eng. and Mech. Eng. and Mat. Sc., Rice University, Houston, TX, USA | ||