An analog simulation of a discrete compensator for a sampled-data system

Abstract

A general method for the analog simulation of an n order digital discrete compensator in a sampled-data servo system is presented,, The method employs operational amplifiers such as are found in ordinary laboratory analog computers 5 and relay sampling switches driven by a low frequency function generator. The method is discussed in relation to the trend to the use of digital devices in control systems and its theoretical development in the algebra of the z-transformation is sketched . The validity of the method was proved by comparing calculated with simulated responses $ showing the accuracy of the simulated system to be no less than that of the computer itself. The usefulness of the simulated discrete compensator is shown in a general investigation of step responses for various z-plane root locations and in an investigation of a simple adaptive system.