离散化方法在基于粗糙集焊接建模中的比较

粗糙集建模方法是一种新的且重要的焊接过程建模方法,离散化是粗糙集建模方法中一个必要且重要的步骤.针对已有离散化方法众多、难以取舍的特点,讨论并确立了焊接建模过程中离散化方法的选择标准.以低碳钢的脉冲钨极氩弧焊为背景,针对相同的建模数据,采用除离散化外相同的粗糙集建模步骤,并以十折交叉确认法为验证方法,对比不同离散化方法对焊接粗糙集模型的预测能力的影响.实验表明,基于熵的离散化方法更加适合焊接过程的粗糙集建模.最后,探讨了基于熵的离散化方法的参数选择.

The Comparison of Discretization Method in Rough Set Based Modeling Method for Welding

Rough set modeling method is a new and important method in the welding process modeling.In this method,discretization is a necessary and important approach.To select proper method from lots of discretization method,proper evaluation criterions in welding field were discussed and decided.Furthermore,the same data sampled from mild steel pulsed gas tungsten arc welding were used as the modeling data,the same rough set modeling method except the discretization approach was used to obtain the rough set model,and the ten folds cross validation method was used to compare the discretization methods' effect mainly on the rough set model's prediction ability.The result shows that the entropy based discretization method is better in welding field.At last,the selection of parameters in the entropy based method was discussed.