Title :
Modified root locus plots for SISO systems with time delay
Author :
Gribble, Jeremy J.
Author_Institution :
Dept. of Electron. & Electr. Eng., Glasgow Univ., UK
Abstract :
The use of modified root locus plots in the assessment of the robustness of closed-loop systems with respect to phase lag is examined. It is suggested that the use of a pure time delay in series with the nominal open-loop transfer function provides a natural model of an important way in which modeling error arises. A modified root locus plot depicting the variation of closed-loop pole magnitudes and damping factors explicitly as a function of the time delay then provides a transparent means of assessing the effects of such modeling error.<>
Keywords :
closed loop systems; delays; poles and zeros; root loci; stability; transfer functions; SISO systems; closed-loop pole; closed-loop systems; damping factors; robustness; root locus plots; stability; time delay; transfer function; Aerospace electronics; Closed loop systems; Damping; Delay effects; Frequency; Open loop systems; Poles and zeros; Robustness; Transfer functions; Uncertain systems;
Journal_Title :
Control Systems, IEEE
