Optimization Design for the Planetary Gear Train of an Electric Vehicle under Uncertainties

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Abstract

The planetary gear train is often used as the main device for decelerating and increasing the torque of the drive motor of electric vehicles. Considering the lightweight requirement and ex-isting uncertainty in structural design, a multi-objective uncertainty optimization design (MUOD) framework is developed for the planetary gear train of the electric vehicle in this study. The volume and transmission efficiency of the planetary gear train are taken into consideration as optimization objectives. The manufacturing size, material, and load input of the planetary gear train are considered as uncertainties. An approximate direct decoupling model, based on subinterval Taylor expan-sion, is applied to evaluate the propagation of uncertainties. To improve the convergence ability of the multi-objective evolutionary algorithm, the improved non-dominated sorting genetic algorithm II (NSGA-II) is designed by using chaotic and adaptive strategies. The improved NSGA-II has better convergence efficiency than classical NSGA-II and multi-objective particle swarm optimization (MOPSO). In addition, the multi-criteria decision making (MCDM) method is applied to choose the most satisfactory solution in Pareto sets from the multi-objective evolutionary algorithm. Compared with the multi-objective deterministic optimization design (MDOD), the proposed MUOD framework has better reliability than MDOD under different uncertainty cases. This MUOD method en-ables further guidance pertaining to the uncertainty optimization design of transportation equip-ment, containing gear reduction mechanisms, in order to reduce the failure risk.

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APA

Xu, X., Chen, J., Lin, Z., Qiao, Y., Chen, X., Zhang, Y., … Li, Y. (2022). Optimization Design for the Planetary Gear Train of an Electric Vehicle under Uncertainties. Actuators, 11(2). https://doi.org/10.3390/act11020049

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