基于变论域模糊PID算法的张力控制

Tension Control Based on Variable Universe Fuzzy-PID Algorithm

张力控制在工业中应用十分广泛,其核心是保持张力的恒定。目前恒张力控制主要采用的算法有分段PID和模糊PID,但是这两种方法控制稳定性差。在常规模糊控制的基础上,引入了变论域的思想并设计了伸缩因子基于函数类型的变论域模糊控制器,以此对执行机构为磁粉制动器的张力系统进行控制。通过建立系统模型对常规模糊控制PID算法和变论域模糊控制PID算法进行了仿真对比,仿真结果表明采用变论域模糊PID算法进行系统控制时具有超调小,响应速度快的优点。

Tension controI is wideIy used in industriaI appIication,its core is to keep the tension steady.Now the constanttension controI is controI ed mainIy by sectionaI PID and fuzzy PID,but these two methods are Iack of stabiIity.This paper intro-duces the idea of variabIe universe of discourse based on the fuzzy controI and designs a variabIe universaI fuzzy con-troI er whose scaIing factor is based on function modeI,which is used to controI the tension system whose actuator is magnetic powder brake.Fuzzy controI PID aIgorithm and variabIe universaI fuzzy PID aIgorithm controI were compared by simuIation on the system modeI.