Reference no: EM132888196
Part: Fatigue analysis of an offshore wind turbine blade
Background:
A small-scale wind energy generation offers a significant potential for supplying small and isolated loads, households, or off-grid communities with no access to the electricity distribution network. Unlike the larger-scale counterparts (wind turbines), small wind systems generally operate unsupervised and operate at different power/rotor speed regulations. The latter could impact the variations of blade performances, particularly when conducting fatigue analysis. Fatigue loading is always a major factor for wind turbine life, particularly rotor blades. Excessive fatigue loads will lead to a reduction in the blade life and increase maintenance costs and financial losses. Figure 1.1 illustrates the external forces acting on a turbine blade. The design against fatigue is therefore an important part of the (small) wind turbine design process. The International Electrotechnical Commission (IEC) has published an International standard for wind turbines design, known as BS EN IEC 61400-1: Wind turbines- Part 1: Design requirements.
Task:
As part of a design consultancy work, your task is to estimate the fatigue life of a turbine blade in this case the NREL 5MW wind turbine (WT) blade. The WT will be operating in a location with an average wind speed of 13 m/s.
In your analysis and report, you should include the following:
1. Description of the relationship between the aerodynamic loads and the normal or axial and tangential forces as well as the pitching moment.
2. A flow chart illustrating the process of fatigue analysis.
3. Using Qblade, the determination of the lift and drag coefficients.
4. By choosing the worst-case condition, a work out evidence (Excel format is accepted) of the fatigue analysis. You could use the pre-determined FE modelling results (Table 1.3) for the analysis (FE modelling is not necessarily needed, but welcome).
Article - Fatigue damage assessment of wind turbine composite blades usingcorrected blade element momentum theory by Chizhi Zhang, Hua-Peng Chen, Tian-Li Huang
Attachment:- Fatigue analysis.rar