Abstract
In this paper, the limitation of the Bristol's relative gain used as the interaction index of multivariable control systems is pointed out. The study on digital simulation in the dynamic interaction of some two input-two output control systems, including dual quality control system of distillation column, has been done; and the interacting responses of 15 control systems are examined under four different situations. The results show that under some particular conditions which are given in this paper the steady-state relative gain can be used as the comparative standard of interaction measure for several control systems; and in some control systems, the distinctive dynamic interaction may be appeared even if their dynamic relative gains are equal at all. Consequently, the dynamic relative gain also can not correctly reveal to interaction property of multivariable system. Thus, new appraisal of the feasibility for Bristol's relative gain array is given in this paper.
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