The physical representation of a steel strip-rolling mill is a damped-spring system [8]
Chapter 0, Problem DP9.6(choose chapter or problem)
The physical representation of a steel strip-rolling mill is a damped-spring system [8]. The output thickness sensor is located a negligible distance from the output of the mill, and the objective is to keep the thickness as close to a reference value as possible. Any change of the input strip thickness is regarded as a disturbance. The system is a nonunity feedback system, as shown in Figure DP9.6. Depending on the maintenance of the mill, the parameter varies as 80 < b < 300. Determine the phase margin and gain margin for the two extreme values of b when the normal value of
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