板料拉深成形液压系统模糊控制建模  

Modeling of fuzzy control in sheet deep drawing

作　　者：朱伟[1] 董湘怀[1] 张质良[1] 

机构地区：[1]上海交通大学国家模具CAD工程研究中心,上海200030

出　　处：《控制理论与应用》2007年第1期122-126,131,共6页Control Theory & Applications

摘　　要：针对板料拉深成形系统中的变压边力液压控制动态性能和稳态精度较差的难题,建立了一个基于模糊PID自适应调整的液压模糊控制模型,并借助MATLAB仿真得到了控制参数的优化模糊查询表．最后结合实际板料拉深成形系统,选取两种变压边力加载模式进行实时变压边力模糊控制应用效果验证．应用结果表明:采用模糊PID自适应控制方式可大大改善拉深成形液压控制系统的动态响应性能和稳态精度．当压边力输入曲线为4吨的阶跃信号,模糊控制下系统的最大超调量仅为理想设定值的4．25％,大大小于原来无PID控制时的21．24％及常规PID控制下的31．07％,且达到稳定状态的调节高度也大大缩小,仅略为5 mm左右,调节时间略为0．24 s;而当输入为U型变压边力加载曲线时,系统的最大超调量比原来无PID控制时下降了约5％,且达到稳态时的调节高度也缩短了约1 mm左右,使整个拉深变压边力系统的动态性能和稳态精度得到了有效的提高．To deal with the undesirable dynamic response and the low steady-state precision of the hydraulic control in sheet-deep drawing, a fuzzy control model is built based on fuzzy adaptive PID adjustment rules. The look-up table for optimal control parameters is generated from MATLAB Toolbox. Two load profiles of variable blank holder force （VBHF） in real tests are applied for testing the real-time effect of VBHF. Experimental results show that when the input signal is a constant VBHF, the over-shoot under this fuzzy control of adaptive PID controller is less than 4.25% of the set-point value, in comparison with the 21.24% with no PID controller and the 31.07% with conventional PID controller. The regulation height and the regulation time are reduced to 5 mm and 0.24 s respectively. When the input signal is a U mode of VBHE the over-shoot is decrease by 5% from the value when no PID is applied, and the regulation height also decreased by 1 mm. These demonstrate that the proposed fuzzy model effectively improves the dynamic response and raises the steady-state precision of the VBHF system.

关 键 词：模糊控制 板料拉深成形 液压系统 PID自适应控制器 MATLAB 

分 类 号：TG385[金属学及工艺—金属压力加工]