- #1
geft
- 148
- 0
I'm given the following system:
[tex]\frac { 3s+0.5 }{ { s }^{ 3 }+3{ s }^{ 2 }+8s } [/tex]
I'm supposed to find the steady state error of the system by plotting the step and ramp responses, and then find the value when s tends to infinity.
Here is the MATLAB code:
Here's the result: http://i.imgur.com/vXoXV.png
As can be seen, the step and ramp responses are unstable. All the roots are on the left of the imaginary axis, so the system must be stable. I'm not sure where I went wrong.
[tex]\frac { 3s+0.5 }{ { s }^{ 3 }+3{ s }^{ 2 }+8s } [/tex]
I'm supposed to find the steady state error of the system by plotting the step and ramp responses, and then find the value when s tends to infinity.
Here is the MATLAB code:
Code:
sys1 = 3 + tf(0.5.*[1], [1 0]);
sys2 = tf([1], [1 3 8]);
sys = sys1*sys2
subplot(1, 2, 1)
step(sys)
sys3 = tf([1], [1 0]);
subplot(1, 2, 2)
step(sys*sys3)
title('Ramp Response')
figure
rlocus(sys*sys3)
Here's the result: http://i.imgur.com/vXoXV.png
As can be seen, the step and ramp responses are unstable. All the roots are on the left of the imaginary axis, so the system must be stable. I'm not sure where I went wrong.