Research On Dynamic Characteristics Of 3K Planetary Gear Transmission System

As one of the most commonly used components in mechanical transmission,planetary gear transmission has long been used in all walks of life.Planetary gear transmission is widely used in aerospace,automobile,wind power,instrumentation,lifting machinery and other fields owing to multiple advantages such as compact structure,light weight,high efficiency and bearing capability.This thesis is based on Ma'anshan Science and Technology Project " Micro-segment gear robot joint reducer R & D " focusing on the dynamic characteristics of the 3K planetary gear drive system.In this thesis,multiple improvements have been made to address the high-complexity and lowefficiency defect that the finite element method has in calculating the gear meshing stiffness;the exact tooth surface equation of involute gear has been derived and secondary development for ANSYS though APDL and UIDL has been accomplished leading to an enhancement in efficiency when calculating the gear meshing stiffness.Aiming at the complexity of multi-engagement angle and multi-displacement of 3K planetary gear drive system,a universal kinematic model of 3K planetary gear drive is established using massconcentration method and the numerical simulation is carried out.The model applies to any system dynamic characteristics analysis under any geometry parameters.In the meantime,aiming at the special structure of double planetary gears in planetary gear train,a method of modeling the double planetary gear angular deviation is proposed.The influence of double planetary gear angular misalignment on the load sharing characteristics of the system is studied.Influence of system parameters on equal load characteristics and its influence on bifurcation and chaos under planetary wheel angular deviation have been summarized.In this thesis,the representation of the angular deviation of a double planetary gear is studied.The influence of the error and rotational speed on the system load-average and periodic stability of a typical 3K planetary gear system is analyzed.The amplitudefrequency characteristic curve and bifurcation diagram of the system are obtained.The work and results in this thesis are conducive to a more in-depth study of complex planetary gear train dynamics behavior.