18 The steady-state solution of stable systems is due to simple poles in the j2 axis of the s-plane coming from the input. Suppose the transfer function of the system is Y (s) H (s) = X (s) 1 (s + 1)² +4° (a) Find the poles and zeros of H (s) and plot them in the s-plane. Find then the correspond- ing impulse response h(t). Determine if the impulse response of this system is absolutely integrable so that the system is BIBO stable. 243

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.18 The steady-state solution of stable systems is due to simple poles in the j2 axis of the s-plane
coming from the input. Suppose the transfer function of the system is
Y (s)
H (s) =
X (s)
1
(s + 1)² +4
(a) Find the poles and zeros of H (s) and plot them in the s-plane. Find then the correspond-
ing impulse response h(t). Determine if the impulse response of this system is absolutely
integrable so that the system is BIBO stable.
243
236
CHAPTER 3 THE LAPLACE TRANSFORM
(b) Let the input x (t) = u(t) and the initial conditions be zero, find y(t) and from it determine
the steady-state solution.
(c)
Let the input x (t) = tu(t) and the initial conditions be zero, find y(t) and from it determine
the steady-state response. What is the difference between this case and the previous one?
(d) To explain the behavior in the case above consider the following: Is the input x (t) =tu(t)
bounded? That is, is there some finite value M such that |x(t)| < M for all times? So what
would you expect the output to be, given that the system is stable?
Answers: System is BIBO stable; yss (t) = 0.2.
Transcribed Image Text:.18 The steady-state solution of stable systems is due to simple poles in the j2 axis of the s-plane coming from the input. Suppose the transfer function of the system is Y (s) H (s) = X (s) 1 (s + 1)² +4 (a) Find the poles and zeros of H (s) and plot them in the s-plane. Find then the correspond- ing impulse response h(t). Determine if the impulse response of this system is absolutely integrable so that the system is BIBO stable. 243 236 CHAPTER 3 THE LAPLACE TRANSFORM (b) Let the input x (t) = u(t) and the initial conditions be zero, find y(t) and from it determine the steady-state solution. (c) Let the input x (t) = tu(t) and the initial conditions be zero, find y(t) and from it determine the steady-state response. What is the difference between this case and the previous one? (d) To explain the behavior in the case above consider the following: Is the input x (t) =tu(t) bounded? That is, is there some finite value M such that |x(t)| < M for all times? So what would you expect the output to be, given that the system is stable? Answers: System is BIBO stable; yss (t) = 0.2.
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