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**Matlab, how to find damped frequency of a sate space matrix euqation?**

Hello:

I am working on a tyre mechanic problem basically it just a vibration problem so far I have dervied the the state space equation which is in the form

x'=[A]x+

**u**

[A] is 2x2 matrix,

[A] is 2x2 matrix,

**is a 1X2 matrix (u could be treated as 0) and they are both known**

but I don't know how to calculate the damped frequency. Anybody could help please?but I don't know how to calculate the damped frequency. Anybody could help please?

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