How to Setup Bode Plot in Simulink
Below is the step by step procedure on how to setup bode plot in Simulink. Bode plot is a graph of gain and phase of a system. In a bode plot you can get the gain and phase margins and know if the system is stable or not.
To demonstrate this properly, consider the Simulink model in Figure 1. You should have license for Simulink control design to use the bode plot. Also in this tutorials I used Matlab R2012b. Higher versions of Matlab may have slight different interface and you need a little exploration.
How to Setup Bode Plot in Simulink – Step by Step Procedure
1. Get the Gain and Phase Margin Plot
The first step on how to setup bode plot in Simulink is to have your model ready. In this article I will assume that you are already familiar on how to create a Simulink model.
- In the Simulink Library Browser, navigate to Simulink Control Design and get “Gain and Phase Margin Plot” under “Linear Analysis Ports”.
- Drag the Gain and Phase Margin Plot to the Simulink model in Figure 1.
2. Setup Linear Analysis Points
- Right click on the line between the transfer function and the scope. Navigate to “Linear Analysis Points” then click “Output Point”. This simply means that we are declaring this section as the output.
- Right click on the line between the “Step” input and the “Summer” then navigate to “Linear Analysis Points” then click “Input Point”
- After putting input and output points, this is the result
As you can see there is a small arrow beside Step input and transfer function.
Диаграмма Боде MATLAB
В этом руководстве будет обсуждаться, как построить график Боде частотной характеристики системы с помощью функции bode() в MATLAB.
Постройте график Боде частотной характеристики системы, используя функцию bode() в MATLAB
Если вы хотите построить график частотной характеристики или данных амплитуды и фазы модели системы, вы можете использовать функцию bode() , которая построит график амплитуды и фазы частотной характеристики данной системы. Например, давайте создадим график Боде динамической системы, передав ее передаточную функцию функции bode() . См. Код ниже.
В приведенном выше коде мы используем коэффициенты передаточной функции и функцию tf() для определения динамической функции. Первым аргументом функции tf() является вектор, содержащий коэффициенты числителя, а вторым аргументом — вектор, содержащий коэффициенты знаменателя, и последовательность идет от большей к меньшей степени. Если мощность отсутствует, то в качестве коэффициента будет использоваться 0.
Как вы можете видеть в выводе, функция bod() автоматически дает заголовок и метки сюжета. Если вы хотите изменить эти настройки, вам нужно сохранить величину и фазу в отдельной переменной, а затем построить график с помощью функции plot() , после чего вы можете дать желаемый заголовок и метки для графика. Например, давайте создадим вышеуказанный график боде с помощью функций subplot() и plot() и изменим его заголовок с помощью функции title() . См. Код ниже.
Как вы можете видеть на выходе, графики такие же, но с другим названием. Вы также можете изменить другие свойства, такие как метки, стили линий, цвет графика, используя свойство Color и т. Д. Проверьте эту ссылку для получения более подробной информации о функции bode() .
Hello! I am Ammar Ali, a programmer here to learn from experience, people, and docs, and create interesting and useful programming content. I mostly create content about Python, Matlab, and Microcontrollers like Arduino and PIC.
Как совместить две диаграммы боде в simulink
In the continuous module in the common toolbox (Continuous), you find the Transfer FCN, pull into the new model.
Find the in Out module in the common module (Commonly Used Blocks) to pull into the new model
Right click on the Transfer FCN module to find linear analysis, select the linearization block (Linearize Block . ), click to enter
In the following interface, you can find the corresponding Bode diagram in the following interface. (Note that the model is run before generating the Bode map)
Bode display method
Show multiple Bode images
The parameters in the model are modified as follows, and the modified operation is run.
Click the Bode map corresponding to the Bode to open the model, you can see the Bode plot of the model after changing the parameters, and our previous Bode plot (Bode Plot1), which separates two separate graphs.
A picture showing different parameters on a picture
The BODE map described above is separated. If we have to make a comparison, you will put it in a drawing, and then we display the Bode map of different parameters in a picture.
Click the Bode Plot1 to open the Bode map, you can see the appearance of the model after changing the parameters in the first figure, the model of the two different parameters can be compared.
Как совместить две диаграммы боде в simulink
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Draw a Bode figure using Simulink
In the continuous module in the common toolbox (Continuous), you find the Transfer FCN, pull into the new model.
Find the in Out module in the common module (Commonly Used Blocks) to pull into the new model
Right click on the Transfer FCN module to find linear analysis, select the linearization block (Linearize Block . ), click to enter
In the following interface, you can find the corresponding Bode diagram in the following interface. (Note that the model is run before generating the Bode map)
Bode display method
Show multiple Bode images
The parameters in the model are modified as follows, and the modified operation is run.
Click the Bode map corresponding to the Bode to open the model, you can see the Bode plot of the model after changing the parameters, and our previous Bode plot (Bode Plot1), which separates two separate graphs.
A picture showing different parameters on a picture
The BODE map described above is separated. If we have to make a comparison, you will put it in a drawing, and then we display the Bode map of different parameters in a picture.
Click the Bode Plot1 to open the Bode map, you can see the appearance of the model after changing the parameters in the first figure, the model of the two different parameters can be compared.