calculate input of a system having output and transfer function

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hossein
hossein 2018-10-3
评论： Raghunandan V 2018-10-5
Dear Friends Hi, I want to identify a complex system. I have used several transfer functions in my system. in one part of my code I have to calculate the input of a system while I have the output and the transfer function consider y=TF*x, I have TF and y and want to estimate x. if I use the TF^-1 or inv(TF) the error of "Cannot simulate the time response of models with more zeros than poles." will occur. So dear friend what is your suggestions and/or solutions?
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hossein
hossein 2018-10-5
why u need the transfer function? for example, u can consider: GW = ( 0.2245 s + 9.002)/(s^2 + 161.4 s + 6448)
consider any kind of stable transfer function (number of poles> number of zeros). when u inverse the transfer the function number of poles will be less than the number of zeros which means the inversed transfer function is unstable. so I can not use the x=TF^-1*y. therefore I am seeking an alternative,

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Raghunandan V
Raghunandan V 2018-10-5
https://dsp.stackexchange.com/questions/16671/output-of-a-system-given-its-transfer-function-and-input-beginner
Does this solve your question? And you cannot directly enter a transfer function with more zeros than poles and hence use the original transfer function and then use inverse or division block for your purpose I am sure this will work
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hossein
hossein 2018-10-5
maybe I do not understand what your mean is by saying output/(( 0.2245 s + 9.002)/(s^2 + 161.4 s + 6448)) I try it but the answer is not true: (601 transfer functions) I am not using Simulink.

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