Research on Dynamic Characteristics of Confluence Planetary Row under Speed Impact

As an important part of the dual-flow transmission device, the confluence planetary row works under the complex working conditions of high load, high frequency and strong impact, and the problem of vibration and noise is particularly prominent. In this paper, a concentrated parameter model of the confluence planetary gear dynamics is established, and the time-varying meshing stiffness, bearing stiffness, damping, shaft bending stiffness and other factors are comprehensively considered to establish a dynamic model suitable for the confluence planetary gear system under speed shock conditions. The dynamic characteristics of the confluence planetary gear under the speed shock load were numerically calculated, and the speed shock conditions were analyzed. The results show that as the speed increases, the vibration amplitude of each component shows an increasing trend; in the state of rotating speed shock excitation, the order spectrum signal is mainly composed of meshing frequency and high-order frequency doubling components, and the amplitude of each component also increases with the increase of speed. The test results are in good agreement with the numerical analysis. The conclusions obtained provide important theoretical support and engineering value for the vibration reduction, noise reduction and performance optimization of the confluence planetary gear system.