The bode plot or the bode diagram consists of two plots. A bode plot is a graph of the magnitude in db or phase of the transfer. Chapter 6 frequency response, bode plots, and resonance 3. A bode plot is a graph of the magnitude in db or phase of the transfer function versus frequency. Interpreting a bode plot of an unknown system to get its transfer function several examples will illustrate how one goes about analyzing the bode plot of an unknown system to.
Obtain the phasor for each output component by multiplying the phasor for each input component by the corresponding transferfunction value. For the transfer function given, sketch the bode log magnitude diagram which shows how the log magnitude of the system is affected by changing input frequency. From this example some simple rules for generating uncorrected bode plots begin to. Click on the transfer function in the table below to jump to that example. Many common system behaviors produce simple shapes e. Examples click on transfer function 1 a real pole 2 real poles and zeros 3 pole at origin 4 repeated real poles, negative constant 5 complex conj. Plot three magnitude curves in one diagram and three phaseangle curves. Chapter 6 frequency response, bode plots, and resonance. It is a standard format, so using that format facilitates communication between engineers. Several examples of the construction of bode plots are included in this file. Part i in this post we will go over the process of sketching the straightline bode plot approximations for a simple rational transferfunction in. In both the plots, xaxis represents angular frequency logarithmic scale. Whereas, yaxis represents the magnitude linear scale of open loop transfer function in the magnitude plot and the phase angle linear scale of the open loop transfer function in the phase plot. The examples given on the following pages all have a normalized unitless.
Meen 364 parasuram lecture 17,18 august 28, 2001 1 handout e. Notice the added straight lines showing the asymptotic behavior corresponding to the hand drawn bode plot. A bode plot is a standard format for plotting frequency response of lti systems. Bode plot example fully explained with complete process in. In this video, i have solved an example on how to sketch the bode magnitude and phase plot. Drawing the bode plot of the frequency response for gs s. In this video, i have explained bode plot example fully explained with complete process for free materials of different engineering subjects use my android a. As an example, consider the bode plot for the simple circuit of fig. Becoming familiar with this format is useful because. Using matlab, plot bode diagrams for the closedloop system shown in figure 894 for k 1, k 10, and k 20. Bode plots page 1 bode plots a bode plot is a standard format for plotting frequency response of lti systems.
90 1438 235 815 60 706 1439 1106 1153 1170 762 357 1595 159 1330 1369 802 79 86 301 1041 1473 1297 1335 67 683 97 1595 45 860 1414 163 1199 605 163 389 945 124 569 967 860 1438 901 146 1188 1319 1452