| Wind energy is an ideal new energy that can be widely distributed and it is also a kind of economic and environmental friendly renewable energy. At present, the main energy on the earth are fossil fuels, by contrast, the advantage of wind power is obvious, environmental protection is the biggest one, as the rapidly development of wind power equipments, wind power is being widely used with its cost reduced. The main form of wind energy, is WTGS(wind turbine generator system) whose important parts is wind turbine blades. As a key component, wind turbine blades play an important part in forming a connecting link between the preceding and capturing the wind directly. Nature wind has randomness and wind shear influence of wind turbine blades, the long-term complex fluid-structure interaction and pneumatic impact, puts forward a lot of on the safety reliability of the wind turbine requirements, so the aerodynamic design and dynamic analysis of wind turbine blade are two significant factors to guarantee the stability of wind turbine work. The main content of wind turbine blade dynamic characteristic analysis is the stability of the system and the resonance problem. When the wind turbine system’s inherent frequency and vibration are at the same, resonance phenomenon appears, which will also brings strong damage effect. To prevent the resonance phenomenon is an important task of the system dynamics analysis. Even if the frequency of wind turbine system is far away from that of exciting force outside world.This article is mainly aims at3.0MW horizontal axis wind turbine blades and the structural dynamic characteristics analysis of wind turbines. Using multi-body system dynamics to establish dynamic model of wind turbine blades, the build applications of blades used flexible modeling method of Joint Beam Element. The method is of a wind turbine blade as a whole into a limited number of universal joints and cylindrical joint of the rigid body. Lagrange equation applied to build dynamic differential equation of movement of fan blade system. The shaping design of turbine blades adopts Wilson, establishes the constraint condition of mathematical optimization model that using MTLAB software to solve the calculation. Airfoils referred in this article is based on the original airfoil optimization to improve income. Profili software is applied to estimate the actual airfoil spatial data, drawing the blade at the cross section of space spline curve, which is based on the free surface modeling function of Pro/E again to modeling of wind turbine blades; the wind turbine rotor of model is established in this paper. By means of MSC.ADAMS software for wind turbine blades and rotor vibration simulation, solving the wind turbine blade natural frequency and vibration model, reoccupy determine GH Bladed software validation. And through the blades and rotor modal analysis of the results of different reasons, to avoid a single blade error produced by modal analysis. |
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