L39 - Insight about dynamics x± Nyquist-Use to check stability x± State-Space Full state feedback x± Nichols Chart System must be open-loop

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Bode Design Guidelines (vdv 8.4) 1. Relative stability: -20 dB/dec slope at or near crossover (only if no RHP zeroes). 2. Steady-state accuracy: low-frequency asymptote 3. Accuracy in operating range: typically need at least 20dB over appropriate frequencies 4. Crossover frequency: is a measure of bandwidth and thus speed of response. Z | 0.635 . Behavior away from crossover c b is known: C GG GG ? 1, M d B ? 0, c | 1 c R 1 ± G G c C GG GG = 1, M d B = 0, c | GG c c R 1 ± G G c 5. Noise rejection: need small M for high frequencies, keep
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Control Design Methods: Root Locus - Need system pole-zero pattern - Often a good place to start -
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Unformatted text preview: Insight about dynamics x± Nyquist -Use to check stability x± State-Space - Full state feedback x± Nichols Chart - System must be open-loop stable x± Bode - Most commonly used - System must be open-loop stable Quanser frequency response: Quanser frequency response data: Quanser: frequency response data Uncompensated Quanser system 250 ( ) G s (s+10)(s+0.086-1.14j)(s+0.086+1.14j) Quanser + PI 250 0.2(1+2.5s) ( ) G s G s ( ) c (s+10)(s+0.086-1.14j)(s+0.086+1.14j) s Quanser + PI + lag-lead 250 0.2(1+2.5s)(1+1.2s) ( ) G s G s ( ) c (s+10)(s+0.086-1.14j)(s+0.086+1.14j) s(1+0.05s)...
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This note was uploaded on 11/06/2011 for the course AERO 100 taught by Professor Willcox during the Fall '03 term at MIT.

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L39 - Insight about dynamics x± Nyquist-Use to check stability x± State-Space Full state feedback x± Nichols Chart System must be open-loop

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