MECH466 - Lecture16-BodeDiagrams-2009W

# gscs desired 1 sketch bode plot of each factor and 2

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Unformatted text preview: resentation Use Sketch the Bode plot of a transfer function Sketch Then, 1. Decompose G(s) into a product form: G(s) Therefore, 2. Sketch a Bode plot for each component on the same graph. 3. Add them all on both gain and phase plots. 2008/09 MECH466 : Automatic Control 19 2008/09 MECH466 : Automatic Control 20 5 Example 1 (cont’d) Example 2 dB dB -20 -20 deg 2008/09 deg MECH466 : Automatic Control 21 2008/09 Example 3 MECH466 : Automatic Control 22 Example 4 dB dB +20 -20 -20 deg -40 deg +45 -45 -45 2008/09 MECH466 : Automatic Control 23 2008/09 MECH466 : Automatic Control 24 6 Example 5 Remark dB Use Matlab “bode.m” to obtain precise shape. Use bode.m” ALWAYS check the correctness of ALWAYS +20 -20 Low frequency gain (DC gain) Low High frequency gain High -40 Example Example deg +45 -45 -90 2008/09 MECH466 : Automatic Control 25 2008/09 Summary and exercises MECH466 : Automatic Control 26 Exercises Sketches of Bode plot Sketches Sketch bode plot. Sketch Basic functions Basic Products of basic functions Products Sketching Bode plot is just …. Sketching to get a rough idea of the characteristic of a system. to to interpret the result obtained from computer. to to detect erroneous result from computer. to Exercises Exercises Read Section 10.2. Solve Problem 10.4. Read Next, Nyquist stability criterion Next, Nyquist 2008/09 MECH466 : Automatic Control 27 2008/09 MECH466 : Automatic Control 28 7 Exercises Announcement Sketch the Bode plot of: Sketch See the updated schedule for Lab 4 See MECH466_LabSchedule_0809 (Mar 5).pdf. Find a transfer function having the gain plot: Find 20dB +20 0dB -40 2 If your group wants to perform Lab 4 on Tuesday If March 24 (4-6pm, or possibly 6-8pm), please (46contact me ASAP. 20 Ans. 2008/09 MECH466 : Automatic Control 29 2008/09 MECH466 : Automatic Control 30 8...
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