Abstract
In this paper, we propose a control design method that directly deals with transient behavior of a step response of a given linear time-invariant system, based on the assignment of characteristic ratios. The proposed technique is applied to control the active suspension system that was provided as a benchmark problem for the special issue of European Journal of Control in April, 2002. In this problem, the design objective is to find a linear discrete-time controller which meets several constraints imposed on two sensitivity functions and the magnitude of control input. Experimental results show that the controller designed meets all the given requirements. The results suggest that time domain step response can often successfully, albeit indirectly, meet frequency domain design specifications.
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