开幅热定型机超喂控制系统模型分析

Analysis of overfeed control system model in open-width heat setting machine

针对现在热定型生产过程中多数依靠人工经验调节超喂量,并未建立超喂控制系统的精确模型,也未分析系统的稳定性,故常出现控制精度不高,控制系统不稳定,控制器参数整定困难的问题,通过分析超喂装置的机械结构与系统组成,得出超喂量与车速之间的关系,提出建立超喂控制系统的模型,并利用劳斯判据求出系统的稳定约束条件以及运用根轨迹方法求得系统的临界稳定增益,确保系统稳定及控制精度,实现热定型生产过程中超喂量的精确自动控制。实验结果验证了超喂控制系统模型的正确性和稳定分析方法的有效性,系统实现了对超喂量的精确定量控制。

During the current heat setting process,the regulation of overfeed mostly relies on manual adjustment instead of setting up accurate model of overfeed control system and analyzing the stability of the system. As a result,the problems of low control accuracy,unstable control and difficult setting of parameters are frequently appeared. By analyzing the mechanical structure and components of the overfeed control system,the relationship between vehicle speed and overfeed was obtained,and the overfeed control system accurate model was established. System stable constraints and marginally stable gain were respectively obtained by Routh Stability Criterion and Root Locus method,which can stabilize the system and realize the automatic control of overfeed. Test results show that the overfeed control system model is correct and the method for stability analysis is effective. The system realizes the accurate quantitative control of the overfeed.