Lightweight design of gear transmission system of wind power gearbox

- Mar 31, 2021-

Wind power gearboxes are the core components of wind power generators. As the installed capacity of wind power gearboxes increases, the quality also increases, which brings great difficulties to the installation and maintenance of wind power generators. Therefore, the optimized design of the wind power gearbox transmission system to realize its light weight has important theoretical significance and practical application value for reducing the installation and operating costs of wind turbines. Based on wind power theory, regression analysis theory, genetic algorithm theory and reliability theory, this paper analyzes the structural characteristics of wind power gear transmission system. Taking the 1.5 MW wind turbine of a wind power company in Ningxia as the research object, the random input load prediction model is established, and the wind power gear transmission system is optimized based on genetic algorithm, and the reliability of the optimized wind power gear transmission system is evaluated. The main research contents are as follows: (1) Mathematical modeling of wind power gearbox random input load prediction. The random input load prediction model is the basis for the optimal design and reliability evaluation of the wind power gear transmission system. Aiming at the problem of low accuracy of predicting wind power input load by classical theoretical formulas, analyzing its randomness, nonlinearity and other characteristics, using nonlinear regression analysis method to establish a wind power gearbox random input load prediction mathematical modeling, based on measured data from a wind power company in Ningxia The verification results show that the prediction accuracy of the model is much higher than the classical theoretical formula method. (2) Optimal design of structural parameters of wind power gear transmission system. The multi-objective optimization function of the wind power gear transmission system is established, and the boundary conditions for the normal operation of the wind power 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 the infinite loop; The wind power company's 1.5MW wind power gearbox transmission system parameters were optimized. The optimization results showed that the volume of the wind power gear transmission system was reduced by 4.59%, and the weight was reduced by 281 kg, which achieved lightweight. (3) Reliability evaluation of wind power gear transmission system optimization design. The failure form of the gear transmission system of the wind power gearbox is analyzed, the reliability analysis model of the wind power gear is established, and the reliability of the gear transmission system of the wind power gearbox is evaluated. The results show that the reliability of the optimized wind power gear transmission system for 15 years of normal operation without failure is 96.21%, which is higher than the 95% required by the standard equipment, and meets the working requirements of the wind power gear transmission system. The research on the optimization design of wind power gear transmission system in this paper provides an effective method for the light weight of wind power gearbox. The research conclusion has certain reference value for the design and optimization of wind power gear transmission system parameters.

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