I build an equivalent circuit in Simulink and it works. Now I want to get the nquvist plot of this equivalent circuit. Does anyone have an idea how to achieve this. Till now I only get the Impedance versus the frequency. I attached the equivalent circuit:
Thanks a lot
When using blocks from "Simscape Power Systems Specialized Technology" use voltage/current measurement blocks (depending on the numerator/denumerator of the transfer function). The outputs of these blocks are Simulink signals. Once you have the signals, you can use the "Simulink Control Design" toolbox to display a Nyquist plot directly. See following link for an example (although for Bode plot, but it is straight forward to apply the procedure to Nyquist plots).
Related
I'm trying to generate a sine wave without using any standard blocks available in Simulink. Right now I'm using constants for phase angle and frequency but eventually I want to vary this and hence not using the standard blocks. Here is the Simulink model
Here is the scope output
The output is not a sinusoidal wave. What am I screwing up here?
I'm using a fixed step auto solver.
As I'm currently not in the possession of Matlab/Simulink so I can't construct a working example. But I think the best solution for your problem is using a Simulink function block. In this block you can define a Matlab function of your own design and it will allow you to generate any signal you want.
Mathworks example
I've been trying to use Simulink for modelling an oscilloscope (including DSP). I am still very novice so please forgive me if the following question is way too easy: How do I implement AC coupling (remove DC component) in Simulink while using analog signals? I know there is a DC blocker, but it only accepts discrete signals and I want to discretize my signal later with an imperfect ADC.
I'm trying to use a MATLAB function for the AC coupling, but I cannot find a way to use the existing analog signal gained from the function declaration. Instead, all MATLAB documentary seems to want me to use an analog device on my computer (https://mathworks.com/help/daq/analog-data-acquisition.html).
Thank you for any efforts and/or suggestions! :)
I don't think using the Matlab Function Block will work since you need to hold a state. To simulate AC coupling, I believe that you need to create a high pass filter. This removes DC from the signal so that the waveform is centered around zero. The corner frequency generally needs to be very low so that there is no distortion of the waveform being measured. You can build this without any special toolboxes. You just need an integrator block, gain block and some summation blocks.
An example is provided below:
This example applies a DC step to the waveform at 1 second. The figure below provides the output
In the upper figure (input) the offset remains, but in the lower figure (output) the offset is removed.
If you want using the matlab AC Coupling function, try using the Matlab Function Block : https://fr.mathworks.com/help/simulink/ug/creating-an-example-model-that-uses-a-matlab-function-block.html . You can use it like any matlab function, i.e. function [out1, out2] = my_function(in1) but it will be defined in a simulink block.
I want to plot gmsk modulator "signal wave form" in simulink. but because gmsk modulator output is complex array, scope can't show it directly, and when I use complex to real / image converter, it's wave form is clearly just flat lines "fig1" rather than "fig2".so i should convert them to sin and cos with their respectively phase and amplitude but don't know how to do it yet. i want to plot something like this "fig2"
thank you.simulink project
When using blocks from the DSP Blockset or the Communications Blockset you'd usually also use the specialized viewers available with those blocksets to view signals. In this case you most likely want the Spectrum Analyzer.
To get familiar with various ways of viewing this type of signal have a look at some of the examples. For instance,
>> commadjcochanint
How to generate the curve of transfer function:
G0(s)=exp(-s)*[(2s+4)/(s^3+5s^2+6s+4)]
using MATLAB and Simulink?
What kind of curve do you mean? Bode plot? Nyquist plot? Step response?
Use the tf function to create your transfer function with the InputDelay parameter to represent the exp(-s), see Models with Time Delays in the documentation for more details.
Once you have your transfer function, you can use functions like bode, nyquist, step, impulse, etc... to generate your "curve" of choice.
All of this requires the Control System Toolbox.
I should stimulate how the lowpass filter work exactly with simulink so i create a signal generator f=50 hz and i make a lowerfilter and after that i want to see it so the only tool that i found it is spectrum analyzer but when i simulate i get two errors
Sorry if it's not really explain because i'm beginner in simulink
The signals being fed into the Spectrum Scope blocks need to be discrete-time signals instead of continuous-time. You can accomplish this by adding a Zero-Order Hold block before each Spectrum Scope, setting the desired discrete sample time in the Zero-Order Hold block's dialog parameters.
As a heads up, you're probably going to want to buffer your signals as well (the spectrum is calculated on "frames" of data, which you can read about here: Create Frame-Based Signals). To do this, you can either use a Buffer block in between your Zero-Order Hold and Spectrum Scope, or select "Buffer Input" in the Spectrum Scope dialog parameters.