在制造过程中,存在一类过程输出与一个或多个独立变量之间有线性函数关系的情况,称为线性轮廓(Linear profile)。针对线性轮廓控制的问题,提出了基于支持向量数据描述(Support Vector Data Description,SVDD)的线性轮廓控制图,并分析了S...在制造过程中,存在一类过程输出与一个或多个独立变量之间有线性函数关系的情况,称为线性轮廓(Linear profile)。针对线性轮廓控制的问题,提出了基于支持向量数据描述(Support Vector Data Description,SVDD)的线性轮廓控制图,并分析了SVDD参数对分类器性能的影响及控制图参数的确定方法。仿真结果表明,基于SVDD的线性轮廓控制图在监控截距和残差变异时比T2控制图性能更好,而监控斜率的变异时,T2控制图性能更好。展开更多
In the current work, to predict and improve the formability of deep drawing process for steel plate cold rolled commercial grade （SPCC） sheets, three parameters including the blanking force, the die and punch comer ...In the current work, to predict and improve the formability of deep drawing process for steel plate cold rolled commercial grade （SPCC） sheets, three parameters including the blanking force, the die and punch comer radius were considered. The experimental plan according to Taguchi＇s orthogonal array was coupled with the finite element method （FEM） simulations. Firstly, the data from the test of stress-strain and forming limit curves were used as input into ABAQUS/Explicit finite element code to predict the failure occurrence of deep drawing process. The three parameters were then validated to establish their effects on the press formability. The optimum case found via simulation was finally confirmed through an experiment. In order to obtain the complex curve profile of cup shape after deep drawing, the anisotropic behavior of earring phenomenon was modeled and implemented into FEM. After such phenomenon was correctly predicted, an error metric compared with design curve was then measured.展开更多
文摘在制造过程中,存在一类过程输出与一个或多个独立变量之间有线性函数关系的情况,称为线性轮廓(Linear profile)。针对线性轮廓控制的问题,提出了基于支持向量数据描述(Support Vector Data Description,SVDD)的线性轮廓控制图,并分析了SVDD参数对分类器性能的影响及控制图参数的确定方法。仿真结果表明,基于SVDD的线性轮廓控制图在监控截距和残差变异时比T2控制图性能更好,而监控斜率的变异时,T2控制图性能更好。
基金Project(107.02-2013.01)supported by the Vietnam’s National Foundation for Science and Technology Development
文摘In the current work, to predict and improve the formability of deep drawing process for steel plate cold rolled commercial grade （SPCC） sheets, three parameters including the blanking force, the die and punch comer radius were considered. The experimental plan according to Taguchi＇s orthogonal array was coupled with the finite element method （FEM） simulations. Firstly, the data from the test of stress-strain and forming limit curves were used as input into ABAQUS/Explicit finite element code to predict the failure occurrence of deep drawing process. The three parameters were then validated to establish their effects on the press formability. The optimum case found via simulation was finally confirmed through an experiment. In order to obtain the complex curve profile of cup shape after deep drawing, the anisotropic behavior of earring phenomenon was modeled and implemented into FEM. After such phenomenon was correctly predicted, an error metric compared with design curve was then measured.
