An application of half-cycle Posicast

The problem of compensating a fourth-order, lightly-damped linear feedback system by means of half-cycle Posicast [1] is examined and the results of analog computer simulations are shown. Transient and frequency responses are presented. Although half-cycle Posicast is ideally suited for driving a second-order system, the resulting behavior of the fourth-order system is seen to be quite good with half-cycle Posicast bringing about a fast step response with almost no ripple and eliminating completely any resonant peaking in the frequency response. The sensitivity of behavior to variations in system parameters is examined. Also the system is tested with a quasi-random input signal. In both cases, results are favorable.