Exercise:$-$

$2-$ Design a PD controller such that $Ts=8\mathrm{.}5sec.$ and O$.$S$.=12\%.$ for system in Figure$1,$ where: $G(s)=\frac{1}{S^3+3\mathrm{.}2S^2+2\mathrm{.}6S+0\mathrm{.}5}$

Fig. $1$ Block Diagram of a System with a Controller D$($S$)$