Dynamic Optimization Design Of The Gear Transmission System For The Wind Turbine

As a sustainable development of new energy, wind power generation has caused more and more concern recently. The gear transmission system of wind turbine as a key component, the performance of the gear transmission system is a decisive factor of the performance of wind turbine. With the development of large-scale wind turbine, higher stability and efficiency of wind turbine are required, while the conventional design method is difficult to meet the time-varying conditions in the environment and high altitude to set up. Therefore, dynamic characteristic analysis and dynamic optimization design of speed-increase gearbox of wind turbine become one of the important tasks.The thesis subject is supported by National Natural Science Foundation and National Supporting Plan Project. Dynamic performance of the gear transmission system of wind turbine is analyzed and optimized by combination of the dynamics of the gear transmission system, numerical computing methods, discrete optimization, etc. It has provided a strong reference for low-vibration and low-cost gear transmission system of wind turbine designed and made in domestic.This dissertation mainly did following work:â‘ The lumped parameter method was applied to establish the dynamic model of the gear transmission system of wind turbine, which considered the time-varying meshing stiffness, system damping and the wind load. According to this model, Newton's laws of motion was used to derive the torsional oscillatory differential equation of gear system. The time varying stiffness, mesh error excitation and damping is analysed, especially the external excitation caused by wind speed changes is analysed deeply.â‘¡Considered the time-varying meshing stiffness, system damping and the varying external load because of the fluctuations of wind speed, the analytical solution of vibration model of wind turbine transmission system is derived by harmonic balance method. It is made that the dynamic optimization design of complex gear system is possible.â‘¢Based on dynamic model, select number of teeth, modulus and helix angle etc as the design variable, the dynamic optimization design model of transmission system of wind turbine is built, which aims at reducing the total mass and reducing the vibration level. â‘£Based on the mixed-discrete combined programming (MDCP), it is provided that the dynamics optimization design process of the transmission system of wind turbine. The optimization result proves fully the design parameter after optimizing can reduce obviously systematic weight and vibration. It is proved that the research results of this thesis is rationality and feasibility.