State Observer for Quarter Car

Hello, everyone, I m modeling State observer for a quarter car in Matlab for a reduction in vibration I have to assumed some poles for the state feedback gain which is giving me one warning Pole locations are more than 10% in error. Can u help me out what does this warning corresponds to? A = [0 1 0 0 0 0;-320 -18.67 320 18.67 0 0;0 0 0 1 0 0; 68.6 4 -90 -6.1 21.4 2.1;0 0 0 0 0 1;0 0 166.67 -16.67 -3722 -16.67]; B = [0;0;0;0;0;3555.55555]; J = [-60.3958+60.1505i -60.3958-60.1505i -50.6557+16.0469i -50.6557+16.0469i -0.7984 3.9940]; K = acker(A,B,J)

Answer 1

[Birdman]

There seems nothing wrong with your inputs. Just I think you missed the point that while you assign two complex conjugate poles to far from dominant region, you forgot to indicate the conjugate of complex number(-50.6557+16.0469i). Use the following J vector and calculate K again.

J = [-60.3958+60.1505i -60.3958-60.1505i -50.6557+16.0469i -50.6557-16.0469i -0.7984 3.9940];

[raju patel]

J=[-8.3958+60.1505i -8.3958-60.1505i -11.6557+16.0469i -11.6557-16.0469i -0.7984+3.9940i -0.7984-3.9940i] these are my actual location of poles where i was getting error can u plesae elabrote and explain me.

[Birdman]

What do you want exactly, i did not understand the problem.

[raju patel]

Thanks for your time i resolved the problem.

Answer 2

[raju patel]

Thank you very much can u elaborate how have u solve this problem it will help me to understand more about this relevant topic