Stability Analysis for G(s) and P(s)

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SUMMARY

The discussion focuses on the stability analysis of the transfer function G(s) = 1/s² and the PI controller P(s) = 6(1 + 1/s). To determine stability, the method involves using the characteristic equation 1 + P(s)G(s) = 0. The system is confirmed to be stable if all roots of this equation have negative real parts.

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Homework Statement



I have a transfer function [itex]G(s) = \frac{1}{s^2}[/itex] and a PI controller [itex]P(s) = 6 \left( 1 + \frac{1}{s} \right)[/itex].

How do I check for stability? Just use 1 + P(s)G(s) = 0 and check the roots?
 
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Yes, if all the roots have a negative real part the system is stable.
 

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