Abstract
A torsional vibration dynamic model is built to predict the torsional vibration characteristics of a power–split hybrid system. On the basis of this dynamic model, the system dynamic equations of hybrid driveline are set, from which the natural frequencies and relevant mode shapes under different driving modes are solved using the corresponding eigenvalue problem. The calculated results show that the low frequencies occur mainly in the torsional vibration of wheels and vehicle, the intermediate frequencies are relevant to the torsional vibration of the sun gears, the differential and the reducer, in general, and the high frequencies are related to the torsional vibration of planets.
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