Write function for control system block

[ongxom]

Homework Statement

Write function for control system block

Homework Equations

The Attempt at a Solution

4 and D are parallel so we add them :

I am stucking in the simplication of this block

Should I group these elements to a function called w[nT], so
y[nT]/x[nT]=1/(1-0.1w[nT])

and by my reduction w[nT]=2(4+D), is it correct ?

 

[NascentOxygen]

In going from the diagram in (1) to that in (3) you replaced the 3 symbols by 1, so that summing symbol should have disappeared, too. Then simplify a block D+4 followed by a 2 into one of 2(D+4).

 

[rude man]

Doesn't "D" stand for delay? So put in the delay. D is not some constant. Unless I miss my guess.

 

[NascentOxygen]

Sampled data ... I missed that.