自抗扰控制技术在钢坯闪光对焊位置伺服系统的应用

Application of ADRC in position servo system for billet flash butt welding

为提高钢坯闪光对焊液压位置伺服系统的品质,采用自抗扰控制技术进行了控制器的设计,并基于物理模型进行仿真验证.针对系统中存在难以准确数学建模的非线性环节、参数时变的特性以及执行机构存在耦合和干涉的特点,利用AMESim平台构建了系统模型.依据系统的主要影响因素以及在响应速度高、抗干扰能力强、稳定性好的特性要求下,设计了3阶非线性自抗扰控制器.AMESim与Matlab联合仿真结果表明,基于自抗扰控制技术的控制策略不仅具有很好的抗扰动能力,而且取得了较好的位置伺服效果.虚拟仿真试验结果表明,在无头轧制闪光对焊位置伺服中引入自抗扰控制技术是可行性的,并具有其优势性.

To improve the performance of the hydraulic position servo system of billet flash butt welding,which is a key technology for endless rolling system,the active disturbance rejection control(ADRC) technique was proposed in controller design and followed by verifying simulations.Considering the challenges,such as the difficulty in establishing precise mathematical modeling of nonlinear parts for the system,time-varying characteristics of the system parameters,and coupling and interference existing in the actuator,an AMESim platform was adopted to build models.Based on main influencing factors of the system,the third-order nonlinear discrete ADRC was designed to meet the requirements of high speed response,strong anti-interference ability and good stability for the position servo.Simulation of the position servo was carried out through the joint platform integrated AMESim and Matlab to test the validity of the proposed method.The simulated results show that the system had good anti-disturbance ability and better effect of position servo was achieved through the control strategy based on ADRC technique,which verified the feasibility and advantages of using ADRC technology in position servo system of billet flash butt welding.