Numerical Analysis Of The Contact Problem In Wind Turbine Gear

Wind turbine gear box is one of the most important parts in the wind power transmission system, the failure of wind turbine gears caused by the excessive contact stress is the main reason that leads to the abnormal operation of the wind turbine gear box. Therefore, it is very necessary to analyze the contact performance of wind power growth gear in meshing transmission process. This paper aim to the contact problems of wind turbine gear considering the effect of friction.Firstly, based on the Hertz contact theory and finite element method, the contact types and characteristics of a wind power gear box are analyzed. The involute equation and the spiral curve equation are obtained according to the meshing principle of the involute gear. The models of sun wheel and planetary wheel are built and installed using the parametric method of Pro/E software. The assembly of gear is imported into the ANSYS, then the contact stress and contact deformation are obtained with the finite element analysis of wind power gear using ANSYS Workbench.Secondly, the contact stress and contact deformation of wind power gear are analyzed with the transmission speed changing. With the increase of speed, contact stress and contact deformation increased, especially when the driving wheel speed reaches a certain value, the contact deformation increased obviously. The change of the contact stress is so high that it easily induces noise and impact. In the same way, the effect of torque on the contact stress and contact deformation of wind power gear is very high, with the increase of the torque, the contact stress and contact deformation are also increased and show a linear trends.Finally, considering the effect of the friction, the formula of contact stress of gear under the influence of friction force is derived, the influence of friction on the contact stress and deformation of the wind speed gear is analyzed. The results show that, in the process of meshing, stress concentration and the maximum stress value appear near the gear root; When the friction coefficient is less than 0.3, with the increase of friction coefficient, the contact stress and contact deformation increased obviously and shows distinctly linear trend; when the friction coefficient is more than 0.3, with the increase of the friction coefficient, the contact stress is increased slightly and the contact is deformation decreased slightly. Compared the effect of rotational speed and torque on the contact performance of wind turbine gear, the effect of friction force is more obvious.The results show that, in the meshing process, speed, torque and the friction force have great influence on the wind turbine. The results have some reference value to improve the strength, analyze and optimal design the wind turbine gear.