纯电动汽车变速器齿轮传动的多目标优化

Multi-objective Optimization of Gear Transmission of Pure Electric Vehicle

利用常规设计方法对纯电动汽车变速器齿轮传动进行设计,得出齿轮的宏观几何参数。为使纯电动汽车变速器齿轮工作性能达到最优,避免因强度低造成部分轮齿提前失效,对纯电动汽车变速器齿轮传动进行多目标优化。以齿轮齿根弯曲强度均等、齿面接触应力最小为优化设计目标,以常规设计得出的宏观几何参数为初始设计值,以满足斜齿轮强度、齿顶厚、重合度等为约束条件,建立数学模型。利用理想点法进行优化求解,通过Pro/E软件建立优化前后纯电动汽车三维模型,导入ANSYS Workbench软件进行静力学分析。结果表明,在满足设计条件的情况下,纯电动汽车齿轮弯曲强度差值和齿面接触应力均有改善。这一多目标优化为纯电动汽车变速器齿轮宏观几何参数的设计与优化提供了参考。

The conventional design method was used to design the gear transmission of pure electric vehicle transmission,and the macroscopic geometric parameter of the gear was obtained.In order to optimize the working performance of the gear of pure electric vehicle transmission and avoid the premature failure of some gear teeth due to low strength,the gear transmission of pure electric vehicle transmission was optimized with multiple objectives.The mathematical model was established by taking the equal bending strength of the gear root and the minimum contact stress of the tooth surface as the optimal design objectives,taking the macroscopic geometric parameter obtained by the conventional design as the initial design value,and meeting the constraints of helical gear strength,tooth top thickness and coincidence degree.The ideal point method was used to carry out optimization and solution,and the 3D models of the pure electric vehicle before and after optimization were established by Pro/E software,and the static analysis was carried out by ANSYS Workbench software.The result shows that the bending strength difference and tooth surface contact stress of the pure electric vehicle gear were improved when the design condition was satisfied.This multi-objective optimization provided a reference for the design and optimization of the macroscopic geometric parameter of the gear of pure electric vehicle transmission.