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MECH466 - Lecture19-FrequencyDomainSpecifications-2009W

200809 mech466 automatic control 12 3 typical desired

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Unformatted text preview: ed OL Bode plot Steady-state accuracy SteadySensitivity Disturbance rejection Steady-state accuracy C(s) C(s) Relative stability Noise reduction Plant For steady-state accuracy, steadyL should have high gain at low frequencies. Noise reduction Relative stability G(s) G(s) Controller Transient Response speed Transient Overshoot y(t) tracks r(t) composed of y(t) r(t) low frequencies very well. 2008/09 MECH466 : Automatic Control 13 Steady-state accuracy (cont’d) Step r(t) Step r(t) Ramp r(t) Ramp r(t) Increase Increase 2008/09 MECH466 : Automatic Control Typical desired OL Bode plot Steady-state accuracy SteadySensitivity Disturbance rejection Parabolic r(t) Parabolic r(t) Increase Transient Response speed Noise reduction <-20 For Kv to be nonzero, For L must contain at least one integrator. 2008/09 MECH466 : Automatic Control 14 Relative stability Noise reduction <-40 Relative stability For Ka to be nonzero, L must contain at least two integrators. 15 2008/09 Transient Overshoot MECH466 : Automatic Control 16 4 A second order e...
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