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Even though the recent development trend of wind turbine systems has been focused on the MW class large scales. the small scale wind turbine system has been widely utilized because it has some advantages due to easy personnel use and establishment with low cost and energy saving effect. This work is to propose a specific structural design and analysis procedure lor development of a low noise 500W class small wind turbine system which will be applicable to relatively low wind speed region like Korea. The proposed structural feature has a skin-spar-foam sandwich composite structure with E-glass/Epoxy face sheet-Urethane foam core for lightness, structural stability, low manufacturing cost and easy manufacturing process. Moreover this type of structure has good behaviors for reduction of vibration and noise. Structural analysis including load cases. stress. deformation. buckling and vibration was performed using Finite Element Method, and especially the fatigue life estimation was carried out through the load spectrum analysis and the Miner rule. In order to evaluate the designed blade structure structural tests were done. and their test results were compared with the estimated results. In order to satisfy fatigue requirements in designing a cost effective wind turbine system, the blade that is an expensive key component must endure the required operating life more than 20 years. Therefore the fatigue life of the designing blade was estimated by the well-known S-N damage equation, the load spectrum and Spera’s empirical formulae.

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Abstract
1. INTRODUCTION
2. SYSTEM SPECIFICATION AND AERODYNAMIC DESIGN RESULTS
3. STRUCTURAL DESIGN OF LIGHT BLADE
4. STRUCTURAL ANALYSIS
5. PROTOTYPE BLADE MANUFACTURING AND STRUCTURAL TEST
6. Investigation of fatigue life
7. CONCLUSIONS
ACKNOWLEDGMENTS
REFERENCES

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