# Frequency Plot(or bode plot) in SIMULINK

• samiurrehman
In summary, there are two ways to plot frequency response in SIMULINK-MATLAB - using a spectrum analyzer or using commands. However, for accurate results for continuous time systems, linearization can be used to compute bode plots automatically when the system output is given as input.
samiurrehman
Dear all,

Can anyone describe as to how we can plot frequency response in SIMULINK-MATLAB. One way is to use spectrum analyzer but it does not give accurate results for continuous time systems...another way could off course be to use commands but I need something which can compute bode plots itself when the system output is given to it as input.

Thanks

samiurrehman said:
Dear all,

Can anyone describe as to how we can plot frequency response in SIMULINK-MATLAB. One way is to use spectrum analyzer but it does not give accurate results for continuous time systems...another way could off course be to use commands but I need something which can compute bode plots itself when the system output is given to it as input.

Thanks

Hello,

You can try with linearization.
1-right-click on the input line->linearization point->input
2-right-click on the output line->linearization point-> output
3- go on tools->control design->linear analysis
4- At the bottom select the output you are interested in
5- click on linearize and you get the bode plot

## 1. What is a frequency plot or bode plot in SIMULINK?

A frequency plot, also known as a bode plot, is a graph that represents the frequency response of a system. It shows the magnitude and phase of the output signal as a function of frequency, and is commonly used in control systems analysis and design.

## 2. How is a frequency plot created in SIMULINK?

In SIMULINK, a frequency plot can be created by using the "Bode Plot" block from the "Simulink Sources" library. This block takes in the transfer function of the system as an input and outputs the magnitude and phase response of the system.

## 3. What information can be obtained from a frequency plot in SIMULINK?

A frequency plot in SIMULINK provides information about the stability, frequency response, and gain/phase margins of a system. It can also be used to identify the resonant frequencies and dominant poles of a system.

## 4. How can a frequency plot be used for system analysis in SIMULINK?

By analyzing the frequency plot, various characteristics of a system can be determined. For example, the stability of a system can be determined by looking at the gain margin and phase margin, while the resonant frequencies can be identified by observing the peaks in the magnitude plot.

Yes, a frequency plot can be used for system design in SIMULINK. By adjusting the parameters of the system, such as the gain and phase, the frequency plot can be manipulated to achieve a desired response. This is commonly done in control systems design to meet certain specifications and performance requirements.

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