基于自适应模糊PID矫圆控制仿真与研究

Study and Simulation of Correction of Roundness Based on Fuzzy Self-adaptive PID Controller

考虑到天然气管道滚弯加工过程中,管口成形曲率精度不高对输送质量造成的不良影响,提出了基于参数自适应模糊PID动态过程在线矫圆控制新方法。分析了具有双向预弯功能的对称倾斜下调式三辊卷板机的工作原理及其工作中液压伺服系统的非线性和不确定性的特点,建立基于Matlab卷板机矫圆控制系统的数学模型,进行仿真试验。结果表明,将自适应模糊PID算法运用于矫圆控制系统,能有效地解决单纯使用PID控制不能在线调整参数的难题,模糊PID控制系统能以较小的超调量保证控制系统的稳定性,同时控制矫圆误差仅有0.05%,从而验证了将模糊PID控制算法运用于卷板机矫圆控制系统的合理性和有效性。

Considering the harmful effects of low forming curvature precision on the delivery quality dunng the natural gas pipeline rolling process, a new fuzzy self-adaptive PID dynamic control method is proposed, which is applied in the online round-correcting process. The working principle of the symmetric-flit-down three-roller bending machine which has the function of bidirectional pre-bending is analyzed, as well as the nonlinear and uncertain characteristics of the hydraulic servo system. A round-correcting mathematic model of the bending machine control system is established based on MATLAB and the simulation study is carried out. Simulation results show that the new method that applies the new fuzzy self-adaptive PID control method in the round-correcting control system can realize the on-line beyond the function of the traditional PID control. The adjustment of the PID control parameters, which is low overshoot of this proposed method ensures the stability of the control system and the error of round-correcting is only 0.05%, verifying the rationality and effectiveness of applying the fuzzy self-adaptive PID controller to control the precision of roundness.