MECH466 - Lecture19-FrequencyDomainSpecifications-2009W

MECH466 Lecture19--2009W

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Unformatted text preview: ing CL stability. Nyquist plot of L(s) L(s) MECH466 : Automatic Control 2 3 2008/09 MECH466 : Automatic Control 4 1 Example of GM & PM Relative stability on Bode plot (review) dB ωp : ωg : -20 ωg GM: PM: GM -40 deg ωp PM 2008/09 MECH466 : Automatic Control 5 2008/09 MECH466 : Automatic Control Example of GM & PM 6 Example of GM & PM Second order system Second Third order system Third Bode plot Nyquist plot Bode plot 1 0 Nyquist plot 1 0 -50 -50 0.5 -100 -2 10 -1 10 0 10 1 10 0.5 -100 -150 -2 10 2 10 0 -1 10 0 10 1 10 2 10 0 0 0 -50 -100 -0.5 -100 -150 -2 10 2008/09 -1 10 0 10 1 10 2 10 ωp : GM: PM: -1 ωg : -1 -0.5 MECH466 : Automatic Control -0.5 -200 0 0.5 1 7 -2 10 2008/09 -1 10 0 10 1 10 2 10 ωp : GM: PM: -1 ωg : -1 -0.5 MECH466 : Automatic Control 0 0.5 1 8 2 How to compute GM? Course roadmap Modeling Frequency response function Frequency Analysis Laplace transform Transfer function PM computation often requires computational tools. Models for systems • electrical • mechanical • ele...
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This document was uploaded on 03/05/2014 for the course MECH 466 at University of British Columbia.

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