The Dynamics Analysis And Fractal Characteristic Research Of Wind Turbine Blade

As one of the key parts for wind turbine generator system, the GRP blade determined the function and price of wind turbine generator system to a large extent. So in allusion to the structure and working characteristic of wind turbine blade, this paper researched the dynamic characteristic, fatigue life and fractal characteristic based on dynamic response by use of combining theoretical analysis of structural dynamics with analysis of experiments and finite element analysis.Through theoretical calculation, analysis of experiments and finite element method, the models of 300W wind turbine blade were built and verified. And the modal analysis, static analysis and dynamic response analysis were carried out. According to finite element calculation and Miner linear fatigue damage accumulation rule, the fatigue characteristic of blade was analyzed, and its fatigue life was obtained.The finite element model of 1MW wind turbine blade was completed, and its theoretical calculation, static analysis and modal analysis were achieved. Also the fatigue life was estimated.At the same time, dynamic response of 300W and 1MW wind turbine blade was calculated under rated and resonant operating conditions, and dynamic response characteristic of blade was obtained. The dynamic response of blade was researched using the fractal theory. And general dimension value and their spectrograms of blade surface were calculated respectively. In addition, the sensitivity dimension of general dimension was quantitatively analyzed to dynamic response of blade surface. And the dynamic fractal characteristic was found out. A new method was tried to analyze the dynamic characteristic analysis of GRP blade with general dimension theory.A dynamic analysis method was gained by research, and it offered a method and foundation of theory, simulation and experiment to the research and development of blade.