Questions tagged [root-locus]
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0answers
22 views
How to treat poles with imaginary part when using root locus angle criteria - what is the angle to use?
Context: In the process of designing a phase-lead compensator for a system, I have used the design requirements to find the ideal locations for my closed-loop (CL) poles, have picked a place for a new ...
0
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3answers
118 views
Root Locus, Gain in Feedback Loop. Need help
So this is the system for which I have to draw a root locus if 'K' changes from 0 to infinity. The problem for me is that root locus is drawn for open loop transfer function but 'K' is in the feedback ...
3
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1answer
259 views
Pole Zero Cancellation on a Root Locus
Question: ...design a controller in the feedforward path to minimise the effects of the two pairs of dominant poles. Use a pole-zero cancellation technique on a root locus diagram....
I have a 5th ...
2
votes
2answers
94 views
Root Locus and Imaginary Axis
I’m having some serious issues finding the point at which the root loci cross the imaginary axis for the following Open Loop Transfer Function (OLTF) ;
We have been taught to substitute s = jw and ...
0
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1answer
110 views
How to calculate roots using root locus method? [closed]
Find the roots of the following polynomial by use of the root locus method.
3s⁴ + 10s³ + 21s² + 24s + 30 = 0
(The root locus plot has not been given.)
Can you please help me with this?
This ...
0
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2answers
80 views
Root locus, where do they leave the line parallel to imaginary axis
I know how to sketch by hand root locus of simpler systems. Consider the root locus which Matlab gives for:
$$G(s) = \frac{1}{(s+4)(s+6)(s^2 + 10s + 100)}$$
I've marked the points of interest P1 and ...
0
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1answer
235 views
Root locus for an open loop transfer function?
The function, rlocus(), in MATLAB is used for closed loop system roots for variation in gain K. However, I am curious if there is a similar function for variation ...
1
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0answers
398 views
Designing PID controller for 2 servo motor synchronization
I am trying to use a PID controller to synchronize wheel speeds in an arduino-bot so that I can get it to drive straight. I am unsure how to approach this problem without knowing the physical ...
0
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2answers
1k views
How to find the intersection point in rootlocus diagram?
Question:
Sketch the root locus for the open loop transfer function of a unity feedback control sytem given below and determine the value of K for \$\xi=0.5\$
\$G(s)=\frac{K}{s(s+1)(s+3)}\$
--...
0
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0answers
97 views
Question about the transfer function found from state space model
I'll make up a problem to explain what I'm having trouble with. $$\dot x=\begin{bmatrix}0&1\\-5&-6\end{bmatrix}x+\begin{bmatrix}0\\1\end{bmatrix}u=Ax+Bu\\\\y=\begin{bmatrix}0&1\end{bmatrix}...
3
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3answers
5k views
Determining imaginary axis crossing of a root locus
I have an equation \begin{equation}{\text{L}\left(s\right)=\frac{K}{s(s+4)(s^2+6s+64)}} \end{equation}
and I am trying to determine it's root locus by hand.When I try plotting it with matlab, the ...
