Analysis And Guard Of Vibration For The MW Grade Wind Turbines

As an important problem of economic development, resourcse is an urgent problem of human survival and development. A series of serious circumstance problems was caused by the limitation of conventional resources, threatened the survival and development. So exploiting and using the new energy became an important component of the world energy continuable development strategy. Wind power is one of the new energy which has great development potentiality. For its cleanness, no pollution, technique mature, great single capacitance, shot buliding cycles, wind power has better economy and society benefit, so it is paid high attention.Presently, the trend of the world's wind turbines technology is making progress towards to large stand-alone, the internal indraught and studying of the big wind turbine tower's high and blade's diameter is several decade miles, In order to make the big structure secure and stable running in air driving, the dynamic question is an important techonolgy in studying.The primary problem of dynamic researching is the systematic resonance and stability for the wind turbine. The altemate load, air driving force inertial force and elastic force etc that be pressed on the blade of Wind turbine, can bring on coupling vibration of the elastic blade and tower when the wind turbine works in the condition of natural wind. If the frequeney of outside force approaches the systematic natural frequeney,the resonance be happened and arousing intense destroying for wind turbine.Therefore,only making the systematic natural frequency keep away from the frequeney of outside force can avoid resonance.Be tattooed with middle on the basis having canied out large amount of the data surveying and looking up a relevance's, backing "large-scale wind power of Gansu Province Lan Zhou City key scientific and technological projects aircraft crew check and monitor the feedback control device ". In this thesis, the 3- D model and dynamics model of simplified MW wind turbine generator system were built. ThesimPlified model consisted of blades, hub and tower. Based on the Finite Element Method(FEM) basic theory of dynamic analysis, the modal analysis were done on blade,tower and wind turbine generator system. Then vibration characteristic of blade,tower system and wind turbine generator system were analysed. To reduce the cost and weight,the optimum design of the blade has been in progress based on vibration characteristic. Designed one kind of vibration guard module of wind turbine, keep away from the restrict of vibration, in order to make the wind turbine secure and stable running in air driving.