Lightweight Design Of Gear Transmission System In Wind Turbine Gearbox

Wind turbine gearbox is the core component of wind turbines,the weight of gear transmission system becomes larger and larger with the increasing power of wind turbine,which brings great difficulty to the installation and maintenance of wind turbines.Therefore,optimizing the transmission system of wind turbine gearbox and lightening its weight have important theoretical significance and practical application value for reducing the installation and operation cost of wind turbines.Based on wind power theory,regression analysis theory,genetic algorithm theory and reliability theory,this paper is aimed to analyze the structural characteristics of wind turbine gear transmission system.Taking a 1.5MW wind turbine of certain wind turbine company in Ningxia as the research object,the random input load prediction model is established.The wind turbine gear transmission system is optimized based on genetic algorithm,and the reliability of the optimized wind turbine gear transmission system is assessed.The main research contents are as follows:(1)Modeling for random input load of wind turbine gearbox.The random input load prediction model is the basis for the optimal design and reliability assessment of wind turbine gear transmission system.Aiming at the wind turbine input load low prediction accuracy of classical theoretical formulas,the characteristics of randomness and nonlinearity of wind turbine input loads are analyzed,and nonlinear regression analysis method is used to establish a mathematical model for random input load prediction of wind turbine gearboxes,which is verifed by certain wind turbine company in Ningxia.The optimization results show that the prediction accuracy of the model is greater than the classical theoretical formula method.(2)Optimization design of structural parameters of wind turbine gear transmission system.The multi-objective optimization function of wind turbine gear transmission system is established,and the boundary conditions of the normal operation of wind turbine gear transmission system are determined.In order to effectively avoid the phenomenon that the ordinary iterative method is easy to fall into the local minimum value,and an infinite loop uaually occurs,the genetic algorithm is used to optimize the parameters of 1.5MW wind turbine gearbox transmission system of a wind turbine company in Ningxia.The optimization results show that the volume of wind power gear transmission system is reduced by 4.59%,the quality is reduced by 281 kg,and the lightweight is realized.(3)Reliability assessment of optimization design of wind power gear transmission system.The failure mode of wind turbine gearbox gear transmission system is analyzed,and the reliability analysis model of wind turbine gear is established to assess the reliability of wind turbine gearbox gear transmission system.The assessment results show that the reliability of the optimized wind turbine gear transmission system is 96.21% in normal operation for 15 years without failure,which is higher than the 95% of the standard equipment requirement.This meets the working requirements of the wind turbine gear transmission system.This study provides an effective method for achieving the weight reduction of wind turbine gearbox,and the analysis conclusion has certain reference value for the design and optimization of wind turbine gear transmission system parameters.