Dynamics Simulation Analysis Of Wind Turbine Gearbox Based On ADAMS

Wind turbine gearbox is a complex system with multi-body coupling and periodic change, physical prototype test and verify venues for the basis of full-size models are required before being put into official operation. In order to reduce the risk and cost of product development, this thesis establish a dynamic model with rigid-flexible coupling based on modern simulation method for8MW wind turbine gearbox to study the system dynamic performance containing dynamic stress and strain, vibration characteristics and load sharing behavior.Designed and analyzed the8MW wind turbine drive system, determined the two-point support semi-direct-driven structure and power-splitting gearbox, and studied the distribution of power flow in gearbox by force analysis, analyzed of the characteristics and advantages of the new structure. Established the physical model of8MW wind turbine gearbox by UG. Imposed constraint on the physical model by ADAMS, and established gear contact model, and made the gearbox housing, the high-speed stage gear and planet carrier flexible. Finished the establishment of the wind turbine gearbox system dynamic model with rigid-flexible coupling.The speed and gear meshing force is analyzed to verify the validity and reliability of wind turbine gearbox system dynamics model and to check gear strength. Analyzed the distribution of the stress and strain on gearbox housing and carrier during operation and studied the changing regularity of the stress and strain at weak region. Analyzed the system vibration characteristics. Analyzed the type of the dynamic excitation of wind turbine gearbox system by theoretical. Determined the vibration generating mechanism based on the analysis of gear vibration frequency. Studied the natural vibration characteristics of flexible body by modal analysis method. Analyzed the vibration response of the gearbox housing by the measure point.The load sharing behavior of planetary transmission has a great influence on the stability and reliability of the wind turbine gearbox. Calculated the load sharing coefficient by extracting the simulation data of gear meshing force. The load sharing coefficient curve is output by fitting data to analyze the performance. Measure of load sharing is took according to the structural characteristic to improve the load sharing performance. Studied the influence of speed and meshing stiffness to load sharing behavior.The dynamic model of wind turbine gearbox established by ADAMS in this thesis can test and evaluate product performance fully during the stage of the product design cycle, and accurately predict the system dynamic performance. It has an important theoretical significance and engineering applicable value on improving wind turbine design standard, reducing development costs and improving development efficiency.