Questions about control theory

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drcham

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Hello. I have a system as above.
I need help with mathematic equations for analyzing this system. As far as i understand:
Forward Loop transfer function will be Gfl=K3

Feedback Gfb=K2*K4

Open Loop: Gfl*Gfb

CLosed Loop = Gfl / (1+Gol)

But how i can measure noise from K4 block? I need to write transfer function and multiple by noise from K4 to plot it. Can anyone help me with this ?
 

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