aaron_do
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Hi,
Actually I haven't really read up on this in a long time, but just browsing through my book, "Feedback Control of Dynamic Systems", if you have a transfer function which can be written as,
H(s) = (s-a)(s-b) ----------- (s-c)(s-d)(s-e)
you can do a partial fraction expansion to see the effect of each pole. Real poles result in no overshoot, but for complex poles, the amount of overshoot depends on the Q factor, or damping factor of the poles. It seems that you have the transfer function, so you should be able to tell if the overshoot is due to the complex poles just by looking at their Q factor...
regards, Aaron
BTW, if you are injecting a large signal and looking at the overshoot, then the above explanation doesn't really apply since it is for a linear system.
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