Periodic stability assessment of a flexible hub connection for load reduction on two-bladed wind turbines
| Autor: | Birger Luhmann, Po Wen Cheng |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Floquet theory
History Engineering Wind power business.industry Rotor (electric) Nacelle 020209 energy Equations of motion 02 engineering and technology Aerodynamics 01 natural sciences 010305 fluids & plasmas Computer Science Applications Education law.invention law Control theory 0103 physical sciences 0202 electrical engineering electronic engineering information engineering business Reduction (mathematics) Excitation |
| Zdroj: | Journal of Physics: Conference Series. 753:082013 |
| ISSN: | 1742-6596 1742-6588 |
| DOI: | 10.1088/1742-6596/753/8/082013 |
| Popis: | The periodic stability of an innovative load reduction system for two-bladed wind turbines is investigated using Floquet theory. The load reduction system introduces an additional cardanic degree of freedom between the hub mount and the nacelle carrier flange. A reduced rotor model is considered to analyze the time-variant behavior as a function of rotor shapes and design parameters. Aerodynamic excitation of the rotor is neglected in this study. The linearized system equations of motion of this system indicate a dependance of the rotor shape and the periodic system stability. Due to the time-variance of the asymmetric rotor the Floquet multipliers are derived to determine system stability and the dominant periodic coefficients. It can be shown that the rotor shape has a significant impact on the stability of gimbal-hinged rotors. Gyroscopic effects are the reason for a stabilization of disc-like rotors, whereas a cylindrical, two-bladed rotor assembly is in general unstable. The introduction of an additional spring-damper coupling is a possibility to stabilize such configurations, but results show that resonance phenomena have to be accounted for. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|