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From: John Grant on 20 Apr 2010 09:15
Hi,

Iam trying to calculate the total transfer function of a system I am modelling in SIMULINK with one negative feedback loop and a positive feedback loop. I know the transfer functions of both the controllers and the plant and am wandering, can SIMULINK calculate the overall all transfer function (Just the simplified Output/Input)?? Or does anyone know the best way to calculate a simplied model in matlab??

I have tried manually calculating this using MATLAB but I seem to keep making mistakes getting an answer thats definately wrong (since the simplified system will be a 13order system). Any help on the matter would be greatly appreciated.


John
From: John Grant on 20 Apr 2010 12:23
"John Grant" <j.grant.06(a)aberdeen.ac.uk> wrote in message <hqk9cp$k51$1(a)fred.mathworks.com>...
> Hi,
>
> Iam trying to calculate the total transfer function of a system I am modelling in SIMULINK with one negative feedback loop and a positive feedback loop. I know the transfer functions of both the controllers and the plant and am wandering, can SIMULINK calculate the overall all transfer function (Just the simplified Output/Input)?? Or does anyone know the best way to calculate a simplied model in matlab??
>
> I have tried manually calculating this using MATLAB but I seem to keep making mistakes getting an answer thats definately wrong (since the simplified system will be a 13order system). Any help on the matter would be greatly appreciated.
>
>
> John


I have worked the transfer function out in the command window using the "feedback" function, but is there a way to do this in SIMULINK??

John
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