Simulation Analysis Of The Reducer For Variable Pitch System Used In Wind Turbine

The reducer for variable pitch driver used in high power wind turbine is one of the key parts in wind turbine system, and the load-capacity, mechanical properties, dynamic performance and reliability for maintenance-free life of the reducer are one of the key factors which affect the normal operation and maintenance-free life of the entire wind turbine system. Dynamic characteristics of modern mechanical design has become a necessary and important links, so there is a need for modern mechanical engineering to study on dynamic performance of the two-level pin-cycloidal gear planetary reducer with two teeth difference in deep going way. This topic comes from the National Natural Science Fund project (Number:54075049), which important part is study on dynamic characteristics. The works based on virtual prototype technology and finite element analysis theories are followed:(1) Establish the assembly prototype model two-level pin-cycloidal gear planetary reducer with two teeth difference using Pro/E solid modeling software. Virtual assembly analysis and interference test, without interference parts, so as to verify the correctness of Assembly model. Complete the definition of rigid bodies and constraints imposed by Mech/Pro interface software, preparing to import the model to ADAMS.(2) Establish a multiple rigid bodies dynamics simulation model of the reducer and simulation analysis in ADAMS. Include the setting of the working environment and adding contact force before analysis; Analyze angular velocity of all transmission components and compare the result with the theoretical value to verify the model is correct. Analyze simulation curves of angular acceleration in time and frequency domain, then find out the main vibration frequency points of the cycloid and other major transmission components while the reducer is working. It can be seen that uniform load by the way of Analyzing the meshing force between cycloid and pins. Good coincidence between simulation results and theoretic calculated bales proves that the virtual prototype model of the planet-cycloid reducer is valid and reliability.(3) Modal analysis of the main transmission components, such as cycloid, counter shaft, using ANSYS finite element analysis software based on completing solid model for the reducer. Because the low-order modes are more significance in practical engineering, compute and export the values of top-order natural vibration frequency, then compare with simulation results for resonance frequency. Obtain the displacement deformation and stress distribution under loaded of each cycloid by the finite element structure static analysis of bearing capacity that is the core part transmitting torque. The analysis of maximum value and location of stress and deformation provide a basis for strengthening tooth surface. Virtual prototyping provides a virtual test platform for the mechanical design. Dynamic analysis by use of the technology provide the necessary data and analysis basis for physical prototype manufacturing and testing, and an important basis for the optimization of structure and performance and the analysis of vibration, noise and life.