The application of robust multivariable observer in Tandem cold mills

Tandem-cold-mills is a complex multivariable process in which the thickness, hardness and crown of the strip can usually not be measured due to the measure meters out of function and the hostile environment. This paper proposed a novel multivariable observer which is robustly stable for changes to the mill modulus while still providing high observed states accuracy. The performance and stability of the multivariable observer are analyzed and the benefit of the multivariable observer is demonstrated using a simulation and paved the way to the production of an advanced multivariable controller.