Q1 (a) The characteristic equation of a general nth order system is given by q(s) = s" + a,s"-1 + a2s"-2 + ... + an-2s² + an-1s + an Using the Routh-Hurwitz criterion, derive conditions for stability of a general i) first-order system, ii) second-order system iii) third-order system in terms of the coefficients a1, a2, ... An.

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Q1
(a)
The characteristic equation of a general nth order system is given by
q(s) = s" + a1s"-1 + a2s"-2 + .. + an-2s² + an-1s + an
Using the Routh-Hurwitz criterion, derive conditions for stability of a general
i) first-order system,
ii) second-order system
iii) third-order system
in terms of the coefficients a1, a2, ... an.
(b)
The transfer function of a system is given by
G(s) =
s2 + 10s + 30
Calculate the response of this system to a unit impulse input.
(c)
Consider an open loop transfer function of the form K G(s). Briefly describe
three different methods which can be used to determine the values of K for
which the closed loop system remains stable.
(d)
Consider the open-loop transfer function G(s) = What is meant by the
s+1
frequency response of G(s)? Sketch a Nyquist plot and a Bode plot of the
frequency response of this function.
Transcribed Image Text:Q1 (a) The characteristic equation of a general nth order system is given by q(s) = s" + a1s"-1 + a2s"-2 + .. + an-2s² + an-1s + an Using the Routh-Hurwitz criterion, derive conditions for stability of a general i) first-order system, ii) second-order system iii) third-order system in terms of the coefficients a1, a2, ... an. (b) The transfer function of a system is given by G(s) = s2 + 10s + 30 Calculate the response of this system to a unit impulse input. (c) Consider an open loop transfer function of the form K G(s). Briefly describe three different methods which can be used to determine the values of K for which the closed loop system remains stable. (d) Consider the open-loop transfer function G(s) = What is meant by the s+1 frequency response of G(s)? Sketch a Nyquist plot and a Bode plot of the frequency response of this function.
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