MECH466 - Lecture19-FrequencyDomainSpecifications-2009W

General cases but usually gm should be at least 6db

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Unformatted text preview: cially interested In in PM (which typically leads to good GM). MECH466 : Automatic Control 21 2008/09 Typical desired OL Bode plot Steady-state accuracy SteadySensitivity Disturbance rejection MECH466 : Automatic Control Noise reduction C(s) C(s) G(s) G(s) Controller Transient Response speed Noise reduction 22 Plant y(t) y(t) n(t): noise n(t): Relative stability For noise reduction, L should have small gain at high frequencies. Noise reduction Relative stability Transient Overshoot y(t) is not affected by n(t) y(t) n(t) composed of high frequencies. 2008/09 MECH466 : Automatic Control 23 2008/09 MECH466 : Automatic Control 24 6 Typical desired OL Bode plot Steady-state accuracy SteadySensitivity Disturbance rejection Sensitivity reduction Transient Response speed Noise reduction Relative stability Noise reduction Relative stability 2008/09 Transient Overshoot MECH466 : Automatic Control 25 Sensitivity indicates the influence of plant Sensitivity variations (due to temperature, humidity, age.) on closed-loop performance. closedSensitivity function Sensitivity For sensitivity reduction, L should have large gain at low frequencies. 2008/09 Disturbance d(t): disturbance d(t): C(s) C(s) G(s) G(s) Con...
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