Nonlinear Dynamics Analysis Of Gear System Of Wind Turbine Under Flexible Support

Wind energy as one of the effective ways to a solution to renewable energy depletion and environmental pollution problems, wind turbines are being developed rapidly through its own unique characteristics. Large-scale wind turbines typically require high reliability, low maintenance costs, long life and other special features, and wind turbine gear transmission system as a key component of wind turbine must ensure their normal life. The damage to the wind turbine gear drive system components is the main cause o f wind turbine failure under the flexible support tower. Therefore, the analysis of nonlinear dynamics behavior of wind turbine helical gear drive system under flexible support has important practical significance to improve the design of wind turbine and stable operation.This apper stuies the nonlinear dynamics characteristics of gears transmission system under flexible support of high speed shaft. The main research content of this paper is:At first, the natural vibration frequency of tower is calculated based on Ralyleigh method, and then established the finite element model of the wind turbine tower according to the structual charateristic of the tower is solved the first six-order vibration modes and natural frequencies of the tower, which compared with the theoretical calculation of the tower frame natural frequencies to analyze the correctness of the finite element model.Secondly, the internal motivation of gear and backlash function, and different types of nonlinear model gear system are analyzed. And consider flexible support tower, gear varying stiffness, meshing error and backlash affecting factors, the dynamic model of wind turbine gear drive system is established with centralized quality parameter method, deduced nonlinear dynamic equation of gear transmission system for turbine wind under flexible support.Finally, using Runge-Kutta numerical solution is solved to the nonlinear dynamic equations of the gear transmission system for turbine wind under flexible support., and compared of the dynamic response of under rigid and flexible support conditions of wind turbine gear transmission, and analyzed the impact of the tower on the dynamic response of the speed of wind turbine gear transmission system and its variation rules. The obtained results have certain reference significance for design theory of gear transmission system of wind turbine under flexible support.