I know that I have to linearize it, but I don´t know how to enter a perturbation in the velocity after the damp.
If someone know, I would appreciate it.
MATLAB: How to get the bode diagram between the velocity (input) and the force (output) on the damp in simMechanics
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Since R2020a, the Linear Analysis Tool is called Model Linearizer app. The features of the app remain the same, only the name has changed. For more information on using the app, see Model Linearizer.
The steps to linearize your Simulink model are:
1. Open the Linearization tab by clicking *Linearization Manager *in the Apps tab.
2. Now you can specify the portion of the model to linearize. Select a signal in your model. Then, in the Insert Analysis Points gallery, choose the type of analysis point (e.g. Input Perturbation, Open-loop Output).
3. After that, run the linear analysis by clicking the Model Linearizer button.
For a full example that shows the same linearization workflow in R2020a, refer to the following documentation link:
What you are requesting would require a 4 dimensional plot. Let's call the output variable P and the inputs x,y,z. Several options exist:
1. Make surface plots of P on the vertical axis versus pairs of input variables, while holding the third variable constant: P vs x,y at fixed z; P vs y,z at fixed x; P vs z,x at fixedy.
2. Calculate a surface of constant P and make a 3D plot of that surface in x,y,z space. This sounds hard but Matlab has a great funciton, isosurface(), to make this easy.
The plots below illustrate option 1 (left) and option 2 (right), for the function
p(x,y,z)=(1-abs(x))*cos(y*pi/2)*cos(z*pi*3);
Code to make the figures is attached. The same color scale is used in both sets of plots. The left hand plots have p() on the vertical axis; the right hand plots show surface of constant p, in x,y,z space. For the plots on the right, I rotated each plot by hand to a perspective that I liked more than the default perspective, before doing the screen shot. When you hover the cursor over the plot area for a few seconds, some icons appear at the top right of the plot area. One icon is a little cube with a circular arrow around it. Click it. Then you can click and driag in the plot area to rotate it in 3D.
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