MECH466 - Lecture16-BodeDiagrams-2009W

gscs desired 1 sketch bode plot of each factor and 2

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

Ask a homework question - tutors are online