Design method for digital dead beat controllers

Abstract

This paper describes an analog computer method for designing dead beat controllers for linear and nonlinear sampled data system. In this method the output of the digital controller is replaced by the output from a special function generator. Thus the plant input consists of a number of step signals (with variable magnitude and sign) applied at the sampling instants. By adjusting the magnitudes and polarities of the input signals the plant output and the derivatives of the output signal are adjusted so that they have the desired values at the required sampling instant, the signals being observed on a multitrace oscilloscope. The coefficients of the dead beat controller are completely determined by the successive values of the step input signals and the system outputs at the sampling instants. This design method is particularly useful when the plant is nonlinear.