智能控制及MATLAB实现-水箱液位模糊控制仿真设计

水箱水位模糊控制系统设计在MATLAB命令窗口中输入sltank，便可翻开如下图的模型窗口。图1 sltank仿真图翻开MATLAB，输入指令fuzzy，翻开模糊逻辑工具箱的图形用户界面窗口，新建一个Mamdani模糊推理系统。增加一个输入变量，将输入变量命名为水位误差、误差变化，将输出变量命名为阀门开关速度。这样就建立了一个两输入单输出的模糊推理系统，保存为shuiwei1。图2 增加一个输入变量设计模糊化模块；设水位误差level的论域为[2.953.05],误差变化率rate的论域为[-0.20.2]；两个输入量的模糊集为level设为为7个，rate设为5个：其中水位误差level定为NB、NM、NS、ZE、PS、PM、PB；参数分别为[0.012.95]、[0.012.97],[0.012.99]、[0.013]、[0.013.01]、[0.013.03]、[0.013.05]，隶属度均为高斯函数；图3 输入量level的参数设定 误差变化率rate分别为负大，负小，不变，正小，正大。参数分别为，[0.03-0.2]、[0.03-0.1]、[0.030]、[0.030.1]、[0.03-0.2]，隶属度函数均为高斯函数。图4 误差变化率rate的参数设定 阀门的开关速度设为七个等级：快关，中关，慢关，不动，慢开，中开，快开,其论域为[2.953.05]。参数分别为；[2.942.952.96]、[2.9652.972.975]、[2.992.992.995]、[2.99933.001]、[3.0053.013.015]、[3.023.033.035]、[3.043.053.06]，隶属函数为三角形函数。图5 输出量valve的参数设定设计模糊规那么翻开RuelEditor窗口，通过选择添加模糊规那么；If(levelisNB)and(rateis负大)then(valveis快关)(1)If(levelisNB)and(rateis负小)then(valveis快关)(1)If(levelisNB)and(rateis不变)then(valveis快关)(1)If(levelisNB)and(rateis正小)then(valveis中关)(1)If(levelisNB)and(rateis正大)then(valveis不动)(1)If(levelisNM)and(rateis负大)then(valveis快关)(1)If(levelisNM)and(rateis负小)then(valveis快关)(1)If(levelisNM)and(rateis不变)then(valveis快关)(1)If(levelisNM)and(rateis正小)then(valveis中关)(1)If(levelisNM)and(rateis正大)then(valveis不动)(1)If(levelisNS)and(rateis负大)then(valveis中关)(1)If(levelisNS)and(rateis负小)then(valveis中关)(1)If(levelisNS)and(rateis不变)then(valveis中关)(1)If(levelisNS)and(rateis正小)then(valveis不动)(1)If(levelisNS)and(rateis正大)then(valveis慢开)(1)If(levelisZE)and(rateis负大)then(valveis中关)(1)If(levelisZE)and(rateis负小)then(valveis慢关)(1)If(levelisZE)and(rateis不变)then(valveis不动)(1)If(levelisZE)and(rateis正小)then(valveis慢开)(1)If(levelisZE)and(rateis正大)then(valveis中开)(1)If(levelisPS)and(rateis负大)then(valveis慢关)(1)If(levelisPS)and(rateis负小)then(valveis不动)(1)If(levelisPS)and(rateis不变)then(valveis中开)(1)If(levelisPS)and(rateis正小)then(valveis中开)(1)If(levelisPS)and(rateis正大)then(valveis中开)(1)If(levelisPM)and(rateis负大)then(valveis不动)(1)If(levelisPM)and(rateis负小)then(valveis中开)(1)If(levelisPM)and(rateis不变)then(valveis快开)(1)If(levelisPM)and(rateis正小)then(valveis快开)(1)If(levelisPM)and(rateis正大)then(valveis快开)(1)If(levelisPB)and(rateis负大)then(valveis不动)(1)If(levelisPB)and(rateis负小)then(valveis中开)(1)If(levelisPB)and(rateis不变)then(valveis快开)(1)If(levelisPB)and(rateis正小)then(valveis快开)(1)If(levelisPB)and(rateis正大)then(valveis快开)(1)这35条模糊控制规那么的权重都为1.图6 模糊控制规那么的设定利用编辑器的File/SavetoWorkspace,将当前的模糊推理系统，以shuiwei1保存到工作空间中。在如图1所示的Simulink仿真系统中，翻开FuzzyLogicController模糊逻辑控制器模块对话框，在其FISFileorStructure参数对话框中输入：sh