基于改进实数编码遗传算法的2K-H行星齿轮优化设计

遗传算法(GAs)是基于生物进化理论发展起来的一种应用广泛且高效的随机搜索与优化方法。为克服二进制编码遗传算法处理实数编码问题时需要解码、编码操作,算法计算精度不高问题,提出一种改进实数编码的遗传算法,算法采用非均匀交叉和非均匀变异。针对约束优化问题,应用改进实数编码的遗传算法结合自适应约束处理方法,以2K-H行星齿轮约束优化问题为例进行数值实验。结果表明,改进实数编码的遗传算法计算结果与已有文献比较,新方法有效且精度高。

混合动力汽车用行星齿轮结构参数优化及应用

外齿圈和太阳轮的齿数之比是行星齿轮机构的特征参数,确定该参数是动力系统匹配的重要部分,故需对该特征参数进行优化.首先,分析混合动力汽车对动力部件的性能要求,进行动力部件的选型设计,并制定混合动力汽车能量分配策略;然后,对包含行星齿轮机构的整车动力系统进行动力学和运动学分析,确定其动力学微分方程,建立描述行星齿轮机构特征参数与动力部件的最高转速和整车设计最高车速的函数关系,并仿真寻优;最后,在Advisor中仿真验证.结果表明,整车匹配合理,验证了寻优方法的正确性.

The design analyze of new hybrid drive concept

This paper presents the design method of hybrid drive system for the minibus with some limited conditions. The approach of design hybrid drive system is based on the dynamic modeling and simulation of the hybrid minibus with planetary gear system. The main target of the design is to obtain the optimal design with the proper hybrid drive configuration and control for a given set of design constraints. In oder to meet the design target, it＇s necessary to adjust some parameters such as mechanical ratios and parameters of battery pack as well as control by simulation. During simulation the transient operating process can be studied in details with the dynamic model in Matlab/Simulink. The control strategy can be optimized by running the simulation and monitoring the operation of each components： the operating area of internal combustion engine （ICE）, fuel consumption （energy consumption）, the power distribution, the torque and rotary speed of ICE and motor, the operating efficiency of motor, the aheration of battery state of charge （SOC）, current and voltage.