Strength Analysis Of MW Wind Turbine To Wer

Tower which bearing the total load plays an important role in the wind turbine.With the rapid development of the power capacity,the design for tower with a reasonable size can ensure that tower operates reliablely and steadily and reduce the cost effectively.In recent years,the MW Wind Turbines collapse a lot due to excessive speed,resonance and imbalance,which brings unbearable economiclosses.Therefore,the securityof tower is main concern.The thesis has designed a tower with different thick and radial diameter.Then,the strength of MW wind turbine's tower is caculated,including static strength and dynamic strength.Tower consists of top?middle tower regular segments and bottom irregular segment with the door hole.Tower section consists of the tower's sections?girth welds and connected flange and bolts.According to the international standard,the thesis studies the MW Wind Turbines tower by using engineering calculations and FEM.The static analysis for the tower consists of the tower sections,girth welds,connected flanges and bolts.The untimate strength and fatigue strength calculated for regular parts by using mechanical formula.The tower's bulckling strength calculated by the empirical formula recommended by the industry.The FEM is used to calculate the irregular parts and nonlinear load.The dynamic strength analysis is reasearch on the resonance the vortex-vibration.The natural frequency Calculation is using by FEM and formula.It is concluded that the mass is the main influencing factor of natural frequency and the engineering algorithm is feasible.Basing on the excitation frequency,whether the resonance is reasonalble judged by the Campbell diagram.Lastly,the results of the maximum displacement,inertial force and the fracture strength are calculated by vortex vibration.The designed tower is used for the wind Famer.