Interactive graphics technique for the design of single-input feedback systems

The design technique is applicable to a large class of linear systems described by state equations or cascaded transfer functions. It is based on closed-loop pole assignment which the designer performs by moving the system poles by means of the light pen. The program (SISD) calculates and displays the required feedback coefficients and then a variety of responses, transient and frequency, and further options can be displayed to allow the system performance to be assessed and modified if required. Computation times are very short, of the order of a few seconds, allowing truly interactive design. The technique is fairly general, allowing the use of complete or incomplete state or output feedback. Two illustrative examples are given.