Multivariable LQG optimal control — Restricted structure control for benchmarking and tuning

The paper introduces the benchmarking of multivariable systems using an offline optimal LQG approach. Polynomial system optimal LQG control theory is used to derive a solution to the multivariable restricted structure controller computation. This solution theory is then developed into an computational algorithm. The control problems of the hotstrip finishing mill interstand looper as found in the steel industry are used to demonstrate the multivariable controller benchmarking and restricted structure procedure developed.