Study on Dynamic Characteristics of Gear Transmission System of Wind Turbine

A random wind model based on Weibull distribution with two parameters is built. The varying external-load of gear transmission system of wind turbine, resulting from the random wind, is obtained. A torsional dynamic model of the gear transmission system is established with lumped-parameter method in which time-varying stiffness, damp and meshing error are included. The dynamic responses such as vibration speed, vibration displacement and dynamic mesh force in the gear transmission system of the wind turbine under varying wind load are investigated both in time-domain and frequency-domain, and compared with that under constant wind load. paper three types of multibody models were proposed for the investigation. D. Qin (5) investigated the reliability of the gear transmission system of wind turbine based on dynamics with the time-varying wind speed represented by sine wave. However, since those works did not account for the chaotic character of wind correctly, a reliable mathematical model of wind turbine's gearbox is still not available. In order to describe random varying wind load, a random wind model based on Weibull distribution with two parameters is built. The random varying wind load is taken as the external excitation of gear transmission system of wind turbine. A torsional dynamic model of the gear transmission system is established with lumped- parameter method in which time-varying stiffness, damp and meshing error are included. The dynamic responses such as vibration speed and vibration displacement in the gear transmission system of the wind turbine under varying wind load are investigated both in time-domain and frequency-domain, and compared with that under constant wind load. The research lays a foundation for dynamic performance and reliability optimization designs of gear transmission system of wind turbine. II. Random wind speed model