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damping ratio of systems with poles at origin in control theory

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abhijithvp

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hi all..

i've a doubt regarding damping ratio of systems with poles at origin. Like one 2nd order eqn. as below

1/(s^2+2s)

This eqn seems to have zero natural frequency

I'm confused abt its damping ration..

Pls help

abhijith
 

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