User`s guide

Yaw Damper for a 747 Jet Transport
9-11
The '+' marks on the previous figure show a possible selection. The
corresponding gain and closed-loop poles are
k
k =
2.7615
damp(poles)
Eigenvalue Damping Freq. (rad/s)
-1.01e+000 1.00e+000 1.01e+000
-3.03e-001 + 6.18e-001i 4.41e-001 6.89e-001
-3.03e-001 - 6.18e-001i 4.41e-001 6.89e-001
-3.33e-001 1.00e+000 3.33e-001
Next, form the closed-loop system so that you can analyze this design.
cl11 = feedback(sys11,–k); % negative feedback by default
The closed-loop poles should match the ones chosen above (and they do).
damp(cl11)
Eigenvalue Damping Freq. (rad/s)
-3.33e-001 1.00e+000 3.33e-001
-3.03e-001 + 6.18e-001i 4.41e-001 6.89e-001
-3.03e-001 - 6.18e-001i 4.41e-001 6.89e-001
-1.01e+000 1.00e+000 1.01e+000