During splitting rolling simulation,re-meshing is necessary to prevent the effect of severe mesh distortion when the conventional finite element method is used.However,extreme deformation cannot be solved by the finite element method in splitting rolling.The reproducing kernel particle method can solve this problem because the continuum body is discretized by a set of nodes,and a finite element mesh is unnecessary,and there is no explicit limitation of mesh when the metal is split.To ensure stability in the large deformation elastoplastic analysis,the Lagrange material shape function was introduced.The transformation method was utilized to impose the essential boundary conditions.The splitting rolling method was simulated and the simulation results were in accordance with the experimental ones in the literature.
针对炉温类被控对象提出了一种基于开环阶跃响应的获取对象特征参数的新方法,给出了程序流程图。与两点法、交叉两点法及特征面积法等方法不同,在应用计算机求解的过程中仅需保留邻近4个采样时刻的采样值,且无需阶跃响应达到稳态即可计算出对象的特征参数,具有数据存储量小、速度快、方法简单等特点。应用该方法获取某红外线加热炉温度系统的特征参数,并采用ITAE(Integral Time Absolute Error)设定公式整定PID控制器的参数,取得了较好的控制效果。
