基于GABP和改进NSGA-Ⅱ的高速干切滚齿工艺参数多目标优化决策

Multi-objective Optimization Decision of High-speed Dry Hobbing Process Parameters Based on GABP and Improved NSGA-Ⅱ

针对高速干切滚齿过程中的工艺参数优化决策问题,提出一种基于加工工艺样本预测和多目标遗传优化算法的工艺参数优化决策方法。基于实际加工工艺样本集,以改进的多目标遗传算法(improved NSGA-Ⅱ)为主体模型,以最大刀具寿命、最小加工能耗为优化目标,以加工质量、加工时间为约束条件,利用遗传反向传播算法(GABP)神经网络建立关于加工优化目标的预测模型,将其作为多目标优化模型的适应度函数;通过DBSCAN算法获取待优化滚齿工艺问题的相似样本集,建立多目标优化问题输入区间;构建面向待优化滚齿工艺问题的多目标优化模型,迭代搜索最优工艺参数集。

A method was proposed to optimize and decide parameters in the situation of high speed dry hobbing,supported by example prediction and multi-objective genetic optimization algorithm.Based on actual processing sample sets,the subject model was a variant of NSGA-Ⅱ,the optimization goal was the maximum tool life and the minimum energy consumption.The improved GABP neural network was used to construct a prediction model for the processing optimization fitness function,and a similar instance set of the hobbing problem was obtained through the DBSCAN clustering algorithm,so as to establish multi-objective optimization constraints,and construct the multi-objective optimization model for optimizing and deciding process,which may search the optimal processing parameters iteratively.