- #1

james_a

- 7

- 0

It looks like this:

My understanding is that the numerator in H(s) is supposed to be the laplace transform of the input for the differential equation, so N(s)=L{2du/dt+1}.

I'm not sure how the author got {2du/dt+1}=2s+1. Isn't L{1} supposed to be 1/s? And I'm not sure what to make of L{2du/dt}.

Maybe the author is using "u" to notate the unit step function, so du/dt would be the dirac delta function δ(t), and L{2δ(t)}=2 . Still, where does 2s come from? Why wouldn't they have just written 2δ(t) in the first place? And that still doesn't explain how, apparently, according to the author L{1}=1.

Any clarification is greatly appreciated.