Q5. (20’) A system has input u(t), output y(t) and transfer function G(s) . Let 500 G(s) = s² + 501s + 500 (a). Show that G(s) contains two dynamics components of very different time scales. (b). Obtain the reduced transfer function GR(s) of G(s) by neglecting the fast dynamics. (c). Let u(t) = e“, obtain the output y(t) using the full transfer function G(s). Then obtain y(t) using the reduced transfer function GR(s). (d). Show that the difference between the outputs of G(s) and Gr(s) is very small, i.e., the full dynamics can be approximated by the reduced dynamics.

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Q5. (20’) A system has input u(t), output y(t) and transfer function G(s) . Let
500
G(s) =
s? + 501s + 500
(a). Show that G(s) contains two dynamics components of very different time scales.
(b). Obtain the reduced transfer function GR(s) of G(s) by neglecting the fast dynamics.
(c). Let u(t) = e“, obtain the output y(t) using the full transfer function G(s). Then obtain y(t) using
the reduced transfer function Gr(s).
(d). Show that the difference between the outputs of G(s) and GR(s) is very small, i.e., the full
dynamics can be approximated by the reduced dynamics.
Transcribed Image Text:Q5. (20’) A system has input u(t), output y(t) and transfer function G(s) . Let 500 G(s) = s? + 501s + 500 (a). Show that G(s) contains two dynamics components of very different time scales. (b). Obtain the reduced transfer function GR(s) of G(s) by neglecting the fast dynamics. (c). Let u(t) = e“, obtain the output y(t) using the full transfer function G(s). Then obtain y(t) using the reduced transfer function Gr(s). (d). Show that the difference between the outputs of G(s) and GR(s) is very small, i.e., the full dynamics can be approximated by the reduced dynamics.
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