Microprocessor application for adaptive posicast control of lightly damped systems

Abstract

The problem of compensating a feedback system which is very lightly damped has long confronted control engineers. Numerous schemes have been utilized with varying degrees of succes. This work investigates and applies one such scheme, Half-cycle Posicast, which was introduced by Otto J. M. Smith. This scheme has several advantages. It reduces overshoot and resonant peaking thus allowing higher forward gain to be used. This in turn reduces steady-state errors. The problem of compensating a second order, lightly damped linear feedback system by means of Half-cycle Posicast with microprocessor application is examined and the results of analog computer simulations are shown. The sensitivity of behavior to variations.in system parameters is examined and some degree of adaptivity to changes of parameters is reached.