Abstract
A lumped parameter-rigid elastic coupled dynamic model of two-stage planetary transmission for a hybrid car is established through inter-stage coupled method, after including the elasticity of the ring gear of planet set II and simplifying its elastic supports. Analyzing the relative displacement of various components and considering the time-varying mesh stiffness of each stage gear pairs, the equations of motion are obtained. On this basis, the influences of different working conditions on the dynamic characteristics of two-stage planetary transmission are discussed by the theoretical analysis and experimental testing. The simulation results show the influence trendies of each stage dynamic mesh forces by the input rotational speeds are opposite, but the influence trendies are the same by the load torques; simultaneously, each stage dynamic mesh forces have been affected by the load torque more than the input rotational speed. The vibration experimental results have good consistencies with the theoretical analysis.
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