Reliability Optimization Design And Dynamics Simulation Of NGW Planetary Gear Transmission

The special structure of the planetary gear can meet the different needs of people and it is widely used in various fields, not only for high-speed, high-power and low-speed mechanical transmission of high torque, especially used in the mechanical transmission system increaser and reducer and transformation of speed, and a variety of aviation machinery and lifting machinery, therefore the work of design is an important task of modern designers. As the improvement of the design requirements, reliability theory is gradually applied to the design of the planetary gear. Besides, the distribution function of the probability theory to description of the randomness and multi-objective function of the design parameters will be introduced in order to solve the uniqueness of the design parameters of the selected random values and unity of the objective function and the problem of long development cycle, so as to meet the design requirements. For NGW planetary gear using conventional design methods, it is introduced the reliability index and made its modern optimal design in order to compare and analysis the results of optimization. The use of rigid-flexible coupling multibodys dynamics simulation analysis, and its gear meshing force curve analysis and dynamic carrier velocity curve and the flexible body planetary gear stress cloud are verified the rationality of optimization design to provide a sound argument.According to the reliability theory and modern mechanical optimiz ation design method, the volume, the degree of coincidence efficiency of NGW planetary gear drive are regarded as the objective function, and the reliability coefficient is introduced in the constraints of fatigue strength, and established optimal mathematical model, at the same time, multi-objec tive function is converted into a single objective function to optimize the calculation. Then it needs to use Pro/E software to create parametric soli d model and assemble them. Besides planetary gear and the inner ring is flexible to generate modal neutral file with ANSYS software, and with ADAMS software it is replaced the rigid body and imposed the constraint and loads and made its flexible coupling dynamics analysis, at last it is easy to draw curves of gear meshing dynamic force and angular velocity curve of planet carrier and flexible body planetary gear stress cloud, and laid the foundation for the follow-up contact stress changes and fatigue an alysis.Compared with conventional design method, in the use of reliability optimization design method, the volume is reduced by51.67%, an increase of2.29%in the degree of coincidence, and efficiency increased by0.11%, besides, simulation from the dynamic optimization gear meshing force size is closed to theoretical analysis, and optimize the gear meshing force is smaller than that before the optimization.At the same time, the angular velocity of the carrier is599.6014°/s, i.e.10.4650rad/s with the theoretical angular velocity of the carrier is10.4667rad/s, its value is very similar,and it is analyzed that the inner ring centroid displacement in the actual engagement in the process of change, and flexible body planetary stress distribution, at the same time can obtain stress cloud, and the stress values satisfy the design material yield limit, which is made gear design reference basis for gear design.