Question

Part II 29.[Poles] (a) For each of the pole diagrams below: (i) Describe common features of all functions f(t) whose Laplace transforms have the given

Laplace transform
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asked 2020-11-29
Part II
29.[Poles] (a) For each of the pole diagrams below:
(i) Describe common features of all functions f(t) whose Laplace transforms have the given pole diagram.
(ii) Write down two examples of such f(t) and F(s).
The diagrams are: \((1) {1,i,-i}. (2) {-1+4i,-1-4i}. (3) {-1}. (4)\) The empty diagram.
(b) A mechanical system is discovered during an archaeological dig in Ethiopia. Rather than break it open, the investigators subjected it to a unit impulse. It was found that the motion of the system in response to the unit impulse is given by \(w(t) = u(t)e^{-\frac{t}{2}} \sin(\frac{3t}{2})\)
(i) What is the characteristic polynomial of the system? What is the transfer function W(s)?
(ii) Sketch the pole diagram of the system.
(ii) The team wants to transport this artifact to a museum. They know that vibrations from the truck that moves it result in vibrations of the system. They hope to avoid circular frequencies to which the system response has the greatest amplitude. What frequency should they avoid?

Answers (1)

2020-11-30

Step 1
29 (a) The pole diagram of F(s) tells us about long term behavior of f(t) .it tell us nothing about the near -term behavior .suppose we have just one pole at s=1. among the functions with the pole diagram we have:
\(F(s)=\frac{c}{s-1} , G(s)=\frac{(ce^{-as})}{(s-1)} ,H(s)=\frac{c}{(s-1)}+b\frac{1-e^{-as}}{(s-1)}\)
where c not zero .To be laplace transforms of real functions we must also assume them all to be real and a non negative then these are the laplace transform of
\(f(s)=ce^t , g(t) =\frac{ce^{t-a} \text{ for } t>a}{0 \text{ for } ta}{ce^t+b \text{ for } t}\)
Step 2
\(i)F(s)=\frac{1}{s^2+1}\)
\(ii)F(s)=\frac{c(s+1)}{(s+1)^2+16}\)
\(iii)F(s) =\frac{1}{s-1}\)
laplace transformation of these functions are respectively:
\(i) f(t)=c\sin t\)
\(ii) f(t)=ce^{-t}\cos t\)
\(iii)f(t)=e^t\)

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