Regarding Transfer function blcok

I am working on a Simulink model Which consists of Various Simulink blocks. I have to replace all these blocks with Matlab Function by writing the equivalent Matlab Code in it.

I have got a problem while replacing the Transfer Function in it. i.e, I used "tf" command to replace the first order Transfer Function but my Matlab doesn't consist "Control_Toolbox" which is very expensive. So, Can I replace this Transfer Function with any other logic insted of using Control_ToolBox. The Transfer Function looks as shown below.

Your ideas can be really helpful. Thank you

Answer 1

[Jesús Zambrano]

Hi Nagasai,

When you can say logic, it refers to include types of blocks such as AND / OR / NOT etc instead of your trasnfer function... That´s why I said that it is not possible to do it in that way.

From the screenshot you attach, I think that you want to implement it in time-domain instead of in frequency domain. In this case, you could use the command

sys_ss = ss(sys)

where ss is your trasnfer function.

This function is part of the Control System Toolbox, for more details check this link:

https://se.mathworks.com/help/releases/R2019a/control/referencelist.html?type=function&s_cid=doc_ftr&category=index&s_tid=CRUX_lftnav_function_index

Best,

Jesús

[Naga]

Hi Jesus,

Thank you for your help. Actually my Supervisor told me to avoid using the Control Toolbox instead told that I can implement the code for that PT1 system.

As he mentioned that I can write some code, I thought it is possible to do that. After listening to what you said , I came to the conclusion that we can do that only with the Control ToolBox license

Answer 2

[Jesús Zambrano]

Hi Nagasai,

A transfer function relates the process output ith its input, usually written in frequency domain, where the analysis of such a systems is made by using Laplace transform. In this way, the amplitud of the output at certain frequency is described as a function of the frequency of the input signal. There is not relationship between a transfer function and a logic implementation, therefore, it cannot be replaced with any logic.

Best,

Jesús

[Naga]

Hi Jesus,

Thank you for your response. Actually I have found a code written in another Programming Language when I googled it. I'm attaching that pic below.

So I was wondering whether the same logic is possible in Matlab as well. If possible ,please tell me.

Thank you