基于金属板材渐进折弯成形的闭环控制系统性能分析  

Performance analysis of closed-loop control system based on incremental air-bending forming of sheet metal

作　　者：付泽民[1] 龚攀[2] 陈尉[1] 

机构地区：[1]上海应用技术学院机械工程学院,上海201408 [2]清华大学机械工程系,北京100084

出　　处：《材料科学与工艺》2013年第3期137-142,共6页Materials Science and Technology

基　　金：国家自然科学基金(51105256);上海市教育委员会重点学科建设基金(J51501);上海应用技术学院引进人才科研启动基金(YJ2011-20)

摘　　要：为了解决板材成形回弹问题,将自动控制理论中反馈控制的思想引入到板材渐进折弯成形过程.利用先进的控制技术来解决板材工件的精确成形.然而,闭环控制的稳定性、准确性和快速性会直接影响到系统的正常工作.针对闭环系统稳定性对工件成形品质的影响,建立了渐进折弯成形闭环控制系统模型.通过理论推导,利用小线性化处理及模型简化方法求解闭环系统传递函数及特征方程.采用离散根轨迹法并进行了Matlab/Simulink仿真试验,其结果表明,系统总增益等于一时能确保成形工件形状稳定、快速、准确收敛到目标形状.To solve the springback problem for sheet metal forming,feedback control idea in automatic control theory is introduced to incremental air-bending forming process.The advanced control techniques are used to solve precision forming for workpiece of sheet metal.However,stability,accuracy and rapidity of closed-loop control can directly affect system normal operation.Aiming to analyze the effect of stability on the quality of the formed workpiece,a closed-loop control system model for incremental air-bending forming is established.The transfer function and characteristic equation of the closed-loop system are solved through theory deduction and minor incremental linearization method.Both desktop simulation with Matlab/Simulink and root locus results show that,as the overall gain equal to one,the shape of formed part could converge to target shape at the fastest rate.

关 键 词：板材渐进成形 闭环控制 根轨迹 MATLAB SIMULINK仿真 性能分析 

分 类 号：TG386[金属学及工艺—金属压力加工]