대형 풍력 블레이드의 비틀림 주파수 측정에 관한 고찰
A study on the torsional frequency measurement of wind turbine blades
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초록
When a wind turbine is designed, the dynamic stability of the system as well as the dynamic characteristics of the main components such as blades, hub, main shaft and tower must be evaluated. In particular, the natural frequencies of a blade, as a main load-generating component, need to be measured and assessed by component level testing. In conventional practice, the natural frequencies of a blade are determined as the measured frequencies near the reference frequencies provided by FE analysis results. But the reference frequencies are also uncertain since designers have difficulty distinguishing the torsional mode shape among the analysis results due to the complexity of its mode shape. So, in conventional practice, the determination of a measured torsional frequency inevitably contains uncertainty. Therefore, a novel method to definitely determine the torsional frequencies from the experimental data itself is necessary. In this paper, a new methodology to measure the torsional frequency of a blade was studied from the perspective of a modal test procedure, data processing method and mode determination logic. Finally, the validity of the method that can measure torsional frequency without reference FE analysis results was verified by applying it to an actual large wind turbine blade
Abstract
When a wind turbine is designed, the dynamic stability of the system as well as the dynamic characteristics of the main components such as blades, hub, main shaft and tower must be evaluated. In particular, the natural frequencies of a blade, as a main load-generating component, need to be measured and assessed by component level testing. In conventional practice, the natural frequencies of a blade are determined as the measured frequencies near the reference frequencies provided by FE analysis results. But the reference frequencies are also uncertain since designers have difficulty distinguishing the torsional mode shape among the analysis results due to the complexity of its mode shape. So, in conventional practice, the determination of a measured torsional frequency inevitably contains uncertainty. Therefore, a novel method to definitely determine the torsional frequencies from the experimental data itself is necessary. In this paper, a new methodology to measure the torsional frequency of a blade was studied from the perspective of a modal test procedure, data processing method and mode determination logic. Finally, the validity of the method that can measure torsional frequency without reference FE analysis results was verified by applying it to an actual large wind turbine blade
참고문헌 (10)
- Eric Hau, "Wind Turbines", pp.390~408 (2005), Springer
- IEC, "Wind turbines-Part 23: Full-scale structural testing of rotor blades, IEC 61400-23Standard, 1.0 Edition", International Electrotechnical Commission, ~ (2014)
- Larsen, G. C., "Modal analysis of wind turbine blades", ~ (2002)
- GL, "Part2 Rules and Guidelines Industrial services Guideline for the Certification of Offshore Wind Turbines Standard, Germanischer Lloyd", 6~5 (2012)
- Lorenzo, E. D., "Modal analysis of wind turbine blades with different test setup configurations", Topics in Modal Analysis & Testing, 8, pp.143~152 (2020)
- Luczak, M. M., "Research sized wind turbine blade modal tests : comparison of the impact excitation with shaker excitation", Journal of Physics: Conference Series, 1102(1), pp.012022~ (2018)
- Daniel J. Inman, "Engineering Vibration", pp.551~554 (2009)
- Ahsan F., "Modal dynamics and flutter analysis of floating offshore vertical axis wind turbines", Renewable Energy, 185, pp.1284~1300 (2022)
- Wei, S., "Dynamic response analysis on torsional vibrations of wind turbine geared transmission system with uncertainty", Renewable Energy, 78, pp.60~67 (2015)
- Zhu, H., "Disturbance observer-based torsional vibration damper for variable-speed wind turbines", IFAC Journal of Systems and Control, 14, pp.100112~ (2020)