Analysis of Linear Control Systems with Transpsort Lage

Abstract

A control system, contacting a transport lag is usually difficult for analysis, due to the existence of a transcedental function in the system characteristic equation. Yaohan Chu had presented a phase- angle- loci method, but it becomes increasingly difficult for higher order systems.(1)Eisenberg had given a fairly nice method, but it has been applied only to systems containing one transport lag.(2) In this paper , the root locos method is applied to the analysis of linear control systems with transport lags. The basic approach is to use the special property of zero-order holding circuit to represent a linear control system with transport lag by an equivalent sampled-data control system, then the system stability is analyzed in Z-domain using root-locus method.