A second order system has the following standart form;(adsbygoogle = window.adsbygoogle || []).push({});

http://controls-design.com/mathtex/mathtex.cgi?H%28s%29%3DK%5Cfrac%7B%5Comega_n%5E2%7D%7Bs%5E2%2B2%5Czeta%5Comega_n%20s%2B%5Comega_n%5E2%7D%20%5Cmbox%7B%20for%20%7D%200%20%5Cle%20%5Czeta%20%5Cle%201 [Broken]

However, sometimes the system I confront, doesn't hold that equation. I mean something like

s+1/(s^2 + 5s + 3)

At that point, it looks like the s+1 term on the numerator corresponds to Wn^2

But it shouldn't be if I'm not mistaken.

So, what am I supposed to do in such cases, in order to find the lets say damping ratio ?

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# 2nd order characteristic equation standart form

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