Specifications

rlocus
16-179
16rlocus
Purpose Evans root locus
Syntax rlocus(sys)
rlocus(sys,k)
rlocus(sys1,sys2,...)
[r,k] = rlocus(sys)
r = rlocus(sys,k)
Description rlocus computes the Evans root locus of a SISO open-loop model. The root
locus gives the closed-loop pole trajectories as a function of the feedback gain
(assuming negative feedback). Root loci are used to study the effects of
varying feedback gains on closed-loop pole locations. In turn, these locations
provide indirect information on the time and frequency responses.
rlocus(sys) calculates and plots the root locus of the open-loop SISO model
sys. Thisfunctioncan beappliedtoany of thefollowingnegative feedbackloops
by setting
sys appropriately.
If
sys has transfer function
k
G
k
G
F
k
sys = G
sys = F * G
C
k
G
sys = G * C
–
–
–
+
+
+