The Finite Element Analysis About Direct Driving Magnet Wind Turbine Of Hub And Fastening Bolt

The hub of wind turbine is one part of wind wheel,which connects the blades and axis(stator) by bolts.All the loads coming from the blades transmit to the transmission system through the hub,then to the generator.So the structural strength and fatigue strength of hub and bolts concern the reliability and safety of the wind turbine.The paper analyzes the static strength and fatigue life of hub of the one MW horizontal axis permanent magnet direct drive wind turbine under ultimate load cases by the finite element method,and analyzes the contact strength and fatigue life of the bolts under preload case and other ultimate load cases.It summarizes the analysis methods for the strength of hub and bolts based on the GL specification. The main research content is as follows:①It's obtained the ultimate loads of the blade root and hub center by the software Bladed,which is through the analysis of horizontal axis permanent magnet direct drive wind turbine according to the theory of blade momentum.②The study of the strength analysis of hub: the geometric modeling of hub,the meshing for the model,exerting the boundary conditions and loads.The main point is to compare the method for setting the boundary conditions and exerting the loads,which can obtain one method approaching the practice.③Analyzing the 20 years fatigue life of hub and studying the influencing factors.④Analyzing the contact strength of bolts connecting hub and blades,illuminating the importance of bolts in hub connecting and the proload of bolts contributing more for hub stress.⑤Analyzing the fatigue of bolts with noted fatigue software MSC.Fatigue and Bladed,verificating the requirements of bolts.