In this paper, utilization of digital computers in optimum design of automatic control systems is discussed. DDS (Digital Dynamics Simulator) and DDS-OPT (DDS Optimization Version) are the problem-oriented softwares especially suited for the analysis and design of automatic control system. The optimum design of hot strip mill control systems using this software is presented.
DDS is a kind of block diagram simulator and the user can easily compute the response of the control system if the structure of the control system is given in the form of numerical tables. DDS-OPT is the DDS appended with the function of optimization mode. In this mode, the design parameters are automatically adjusted to obtain the optimum response. As the method of searching the optimum point, the parallel tangent method is used in the DDS-OPT. By this searching method, the number of required search increases only about proportionally to the number of design parameters.
The hot strip mill control system is studied to optimize the design parameters under the constraints on impact drop, recovery time, offset error and motor current. The performance index is defined as the sum of the absolute error and the penalty values. These penalty values are defined as the excess values over the constraints of the design object. The optimum designs are executed with 2 design parameters, with 6 design parameters and with changing the condition of the design constraints. The computer design gives better performance than the design aided by human decisions.

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