Analysis of nonlinear vibration response characteristics of hybrid transmission system with dual-planetary gear sets

Aiming at the hybrid transmission system with dual-planetary gear sets，the purely axial-torsional nonlinear dynamic model considering the internal excitations，including the comprehensive time-varying meshing stiffness and meshing error，and the external excitations，including the load torque and output torque of different power sources，is established. On this basis，the fourth-order Runge-Kutta method is applied to study the nonlinear high-frequency vibration characteristics of the system in the pure electric and hybrid driving modes with different torque excitations. The impacts of the torque allocation of different power sources on each component of the planetary gear sets are obtained. Research results demonstrate that in the pure electric driving mode with dual motors，the vibration response of the front planetary gear set is greater than that of the rear one，and the vibration fluctuation of the rear planetary row is greater than that of the front planetary row. The motor MG2 should preferentially work in the working range with large and constant torque；In the hybrid drive mode，the front planetary row is greatly affected by the motor MG1，and the vibration response amount and vibration response fluctuation range are larger than those of the rear planetary row. The motor MG1 should be kept in a relatively constant working range，and the motor MG2 should preferentially work in a larger torque range. The research results will provide a theoretical basis for the dynamic behavior analysis and torque allocation optimization of the power-split HEV based on the dual-planetary gear sets configuration. © 2024 Editorial Board of Jilin University. All rights reserved.