MECH466 - Lecture16-BodeDiagrams-2009W

0 20 50 40 2 10 1 10 0 10 1 10 100 2 10 2 10 89 90 2

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Unformatted text preview: -180 -180.5 -91 -2 10 -1 10 0 10 1 10 MECH466 : Automatic Control -181 -2 10 2 10 9 Sketching Bode plot 2008/09 TF TF Constant gain Constant Differentiator and integrator Differentiator Double integrator Double First order system and its inverse First Second order system Second Time delay Time 0 1 10 2 10 10 MECH466 : Automatic Control 10 Corner frequency 0 -10 -20 -30 -40 -50 -2 10 -1 10 0 10 1 10 2 10 0 -20 Product of basic functions Product -40 1. Sketch Bode plot of each factor, and -60 2. Add the Bode plots graphically. MECH466 : Automatic Control -1 10 Bode plot of a 1st order system Basic functions Basic 2008/09 1 10 -179.5 -90.5 2008/09 0 10 -179 -89.5 -1 10 Straight line approximation 11 2008/09 -80 -100 -2 10 -1 10 MECH466 : Automatic Control 0 10 1 10 2 10 12 3 Bode plot of an inverse system Sketching Bode plot TF TF Basic functions Basic Constant gain Constant Differentiator and integrator Differentiator Double integrator Double First order system and its inverse First Second order system Second Time delay Time 50 40 30 20 Mirror image of the original Bode plot with respect to ω-axis. 10 0 -2 10 -1 10 0 10 1 10 2 10 100 Product of basic functions Product 80 60 1. Sketch Bode plot of each factor, and 40 2. Add the Bode plots graphically. 2...
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