Block Diagram Reduction of a Control System with Multiple Inputs and a Single Output

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This video makes use of the superposition to calculate the system output due to both measurement noise and the set point inputs. Two methods were used to clarify the principle of shifting a summing point either to the left or right. The block diagram shown here is an example of multiple inputs/single output control system
  1. S Kaed Bey
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in part 2, why can't we just add the 2 blocks instead of moving of the summing point?

jwrnidea
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thank you very much

and to find Y(s)/E(s) when N(s) = 0. How should we do ?

teclairentomb
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I have a confusion in last part of the video in the numerator there will be 15s +20

ek
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Ah, at 8:37 I calculated s+2 - 0.5s i.e. 0.5s+2 for the blocks in parallel due to the minus sign on the summing junction. Can anyone clarify my mistake?

AlfraRed