Design of Positive Position Feedback Compensator(filter)

Plant transfer function,P(s) = (-as-b)/(s^2 + 2
PPF filter transfer function has the form,G(s) = g*wf^2/(s^2 +
2

The closed loop transfer function is T(s) = P(s)/(1-P(s)*G(s))

With the knowledge of P(s), can u suggest any method to determine the filter parameters : gain,g; damping ratio, zetaf; filter frequency, wf ?

I tried the pole placement technique, by equating the characteristic equation of T(s) to (s^2 + 2

Thank you

Plant transfer function,P(s) = (-as-b)/(s^2 + 2

***zeta***w + w^2)***zetaf***wf + wf^2)The closed loop transfer function is T(s) = P(s)/(1-P(s)*G(s))

With the knowledge of P(s), can u suggest any method to determine the filter parameters : gain,g; damping ratio, zetaf; filter frequency, wf ?

I tried the pole placement technique, by equating the characteristic equation of T(s) to (s^2 + 2

***zetac***w1 + w1^2)*(s^2 + 2***zeta***alpha***w1 + (alpha***w1)^2) and arrived at a set of non-linear equations.Thank you