A linear feedback control system has an open-loop transfer function [ A(s)=frac{mu(s+alpha)^{2}}{alpha^{2}(1+s) s^{3}} ] where (mu) and

Question:

A linear feedback control system has an open-loop transfer function

\[
A(s)=\frac{\mu(s+\alpha)^{2}}{\alpha^{2}(1+s) s^{3}}
\]

where $\mu$ and $\alpha$ are adjustable parameters. Find the relation between $\mu$ and $\alpha$ so that the system is stable with unity feedback.

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