Computer-aided control system design accounting pole-zero cancellations by the method of inequalities

Based on the method of inequalities, we propose a computer-aided design method for single-input single-output unity feedback systems accounting the influence of pole-zero cancellations. First, we derive a simple pole-zero placement algorithm which can avoid specified pole-zero cancellations with the order of the controller fixed. Then we propose a simple modification of the search algorithm by taking account of the role of the tuning parameters in the proposed design method. An illustrative design example is also shown