摘要
针对PET瓶胚加热炉独特结构及工艺特点,选择吹瓶机加热过程的灯箱为研究对象,基于能量守恒定律提出了加热炉的功耗和瓶胚温度变化间的关系方程,结合热力学方程推导出加热炉的数学模型是二阶加纯滞后系统。在此模型基础上,将滞后环节采用二阶pade近似,设计出内模PID控制器。实际的工业过程中,在瓶胚加热温度下将设计出的控制器与经典的Ziegler-Nichols整定和Cohen-Coon整定的控制效果进行比较,结果表明,内模PID控制器具有良好的抗干扰性和鲁棒性,且参数整定简单,可有效改善系统的控制效果。
According to the unique characteristics of the PET bottle embryo furnace structure and process,the light box is selected as the object of study.The relationship equation between the power and bottle embryo temperature change is proposed based on the energy conservation law.The furnace mathematical model derived from the thermodynamic equation is second-order system with time delay.By using the second-order pade to approximate the lag links,the internal model PID controller is designed.It is compared among the designed controller,the classic Ziegler-Nichols tuning and Cohen-Coon tuning control in the heating temperature of the actual industrial process.The result shows that the internal model PID controller has simple tuning parameters,good dynamic characteristic,control accuracy and property of robust.
出处
《控制工程》
CSCD
北大核心
2009年第S3期46-48,共3页
Control Engineering of China
基金
广东省科技计划基金资助项目(2005A20302006)
