Rigid-Flexible Coupled Dynamics Simulation And Research On Pitch Reducer For Wind Turbine

Two-level cycloid pin gear planetary reducer in two teeth difference, used as pitch reducer, is known for its wide range of speed ratios, high torque capacity, high efficiency, compact structure and its smooth transmission. In order to satisfy the need of high speed, light quality and long service life without maintenance, study on its dynamic characteristics becomes an integral part of the design process. According to the characteristics of pin-cycloid drive, the elastic deformation of cycloid gear has important implications on dynamic performance of the reducer while the cycloid gear moves with high speed in wide range. Virtual prototype technology provides virtual experiment platform for mechanical design. Dynamics analysis uses this technology to provide the necessary data as foundation for manufacturing process. It provides an important basis for the structure and performance optimization, vibration and noise, assessment of service life of product. Therefore, this research has an important theoretical and practical significance. In this thesis, a rigid-flexible coupling virtual prototype is established for study on dynamic characteristics of two-level cycloid pin gear planetary reducer with two teeth difference. The research mainly includes the following contents as:Geometric model of parts in virtual prototype are established by using3D solid modeling software Pro/E, and they are virtually assembed without interference.Based on the Craig-Bampton Theory, the models of cycloid gears are meshed in ANSYS. So they can be considered as flexible parts in virtual prototype.In software ADAMS/View, the rigid-flexible coupling virtual prototype is established. The corresponding constraints, contact forces, forces, motions, torques and flexible parts are applied to the reducer model assembly. Then simulation of this model is done.Analysis of simulation results is conducted, which includes:verifying the correctness of the virtual prototype, analysis of meshing force between pin teeth and cycloid gear and its frequency spectrum, analysis of contact force between pin and cycloid gear and its frequency spectrum, analysis of angular acceleration of cycloid gear, the input shaft, the middle shaft and the output shaft and their frequency spectrum. The main vibration frequencies are calculated for the overall reduces.Study on the factors affecting vibration of the whole system and discussion. Analysis of effecting on stiffness, damping, input speed, elastic deformation of cycloids and input shaft. Several points were made on ways to reduce vibration.