IPM03A
IPM03A
IPM03A
IPM03A
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而一旦偏心干扰使厚度精度进入了混沌现象，原周期性和对象模型参数一定会产生较大变化，原PI最优控制器将不再为最优，厚控精度发生较大偏移。这从图5 中可以清楚看到。图5中上图是来料厚度波动；中图是偏心干扰未使厚度偏差进入混沌时，厚度偏差被抑制到输入干扰的50%；下图是偏心干扰已使厚度偏差进入混沌时，厚度偏差未被抑制，反而有所升高。这对于要求产品厚度程度在 以上的AGC轧机控制系统来说是不允许的。
图1 监控AGC
4 结论
为进一步提高热连轧产品质量，尤其是厚度精度，本文针对偏心外扰的影响，进行了一些新的探讨。由于计算机离散化控制对控制频率和其他参数有依赖性，偏心外扰发生混沌现象是可能的，但何时发生，尚需进一步研究。但一旦产生此现象，必须要给予足够的重视。厚度精度通过传统的方法不能满足要求时可尝试下列方法[6]：
（1）通过改变变形区的润滑状况，来改变阻尼系数 。
（2）通过偏心控制来改变偏心力 。
（3）通过调节轧钢速度设定，来改变偏心频率 。
（4）如果能够在线辨识混沌是否出现，在线改变控制器参数，同样可以达到控制混沌作用，提高产品精度的目的。
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