DESIGN OF DELAYED CONTROL-SYSTEMS USING A SIMPLE FREQUENCY-DOMAIN CRITERION

The design of delayed control systems without limitation on the orders of the plant and the controller is given using a simple frequency-domain criterion that partitions the space of the controller parameters into two sets: one is undesirable and will cause an unsatisfactory response; the other is desirable and can guarantee robust stability and attain satisfactory response with little overshoot and little oscillation. From the desirable set, the final design parameters are easy to obtain by searching the set of controller parameters that lead to the maximum open-loop gain. One example is given to compare the results obtained by conventional methods with those of the method in this paper.