how to convert tranfer function into a polynomial function?
14 views (last 30 days)
Show older comments
I have got an transfer function which is having a relative degree of 4 or higher. I want to find out the gain for root locus based design for a given dominant pole. for the Transfer function I have got i need to substitute the value of s. for that i need to convert Transfer function into a polynomial so that i can use substitution operation.
Sam Chak on 12 Mar 2023
I think you use the minreal() and tfdata() function.
s = tf('s');
ncp = 1.656e09*s^4 + 2.751e12*s^3 + 1.196e15*s^2 + 4.445e16*s + 4.433e15;
dcp = 25*s^7 + 75982*s^6 + 8.552e07*s^5 + 4.409e10*s^4 + 1.057e13*s^3 + 1.049e15*s^2 + 2.797e16*s;
G = ncp/dcp;
Gcl = feedback(G, 1)
Gcl = minreal(Gcl)
[num,den] = tfdata(Gcl, 'v')
Find more on Polynomials in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!Start Hunting!