The steady state error for a unity feedback system for the input r(t) = Rt^2/2 to the system G(s) = K(s+2)/s(s^3+7s^2+12s) is(a) 0(b) 6R/K(c) ∞(d) 3R/KThe question was posed to me in quiz.Enquiry is from Steady-state Errors and Error Constants in section Time Response Analysis, Design Specifications and Performance Indices of Control Systems

The steady state error for a unity feedback system for the input r(t)

1.	The steady state error for a unity feedback system for the input r(t) = Rt^2/2 to the system G(s) = K(s+2)/s(s^3+7s^2+12s) is(a) 0(b) 6R/K(c) ∞(d) 3R/KThe question was posed to me in quiz.Enquiry is from Steady-state Errors and Error Constants in section Time Response Analysis, Design Specifications and Performance Indices of Control Systems
Answer» RIGHT CHOICE is (B) 6R/K The EXPLANATION: KA = 2K/12 = K/6 Ess = 6R/K.

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