Simulation time in Simulink

I need to run a simulation from x sec to y sec in Simulink enviroment. I go to Solver --> set Start time=x Stop Time=y and run simulation. But this doesn´t work because simulation keep starting @ 0 sec. Does anybody knows how to do it?

Answer 1

[Jingfang Qu]

Hi,

I understand you had some issue when you tried to set the simulation time for the Simulink model. You are in the right direction:

1. Configuration Parameters->Solver->Simulation time

2. Set start time=x, Stop Time=y;

3. Click Apply, then click OK.

4. Simulate the model, it should start with x and stop at y.

To see the start time, you can click on Step Forward instead of run, then you will see T=x at bottom right.

Thanks

[Pablo Panitta]

Thanks Jingfan for you help. Unfortunately this is exaclty what I´m doing, but for some reason, simulation always starts at 0 sec. See attached. For sure, threre is something I´m doing wrong, but I don´t know what. Br Pablo

[Jingfang Qu]

Have you checked the time T at the bottom right when you use Step Forward? Does it also show T=0?

[Pablo Panitta]

Yes and actually appears the T=Tstart x sec, but simulation always start running from 0 sec. Really weird...

[Siddharth Kamila]

In simulink model, how will we give a simulation time interval in between, while the simulation is running from 0 to 5 sec. Is there any code syntax for this ?

For e.g. :- Let's say, when we start the simulation from 0 sec to 5 sec, the data is processed (input data is given to a system and output data is generated) from 0 sec to 0.05 sec time, then there is an interval from 0.05 sec to 0.06 sec (no processing of data will take place in this interval, no input will be sent to the system and thus no output is generated), and again the data processing goes on (input data is given to a system and output data is generated) from 0.06 sec to 0.11 sec, then again there is interval at 0.11 sec to 0.12 sec (no processing of data will take place in this interval, no input will be sent to the system and thus no output is generated), again from 0.12 sec to 0.17 sec the data processing goes on (input data is given to a system and output data is generated), from 0.17 sec to 0.18 sec, there is an interval (no processing of data will take place in this interval, no input will be sent to the system and thus no output is generated), and like that, this process goes on till 5 sec simulation time.

So, is there any code syntax for providing this time interval ? Atleast give me some suggestion. I am not asking for an exact answer.

Answer 2

[Ankita Bansal]

Hi, can you see time offset(=4) at bottom right of your figure window?

The time offset is actually the start time you have given. The simulation runs from T=4 sec to T=12 sec only. It's just that the graph is shifted by 4 secs (x secs ).

You can also export the data to workspace and check for the min and max values of tout.

[Pablo Panitta]

Hi Ankita

Thanks for you comment. I think this is exactly what I´m doing, but for some reason doesn´t work. As you can see in the video stored in GDrive, simulation actually last 8 sec, but doesn´t start @ 4sec but 0 sec. Let me know if you see something wrong in the setup.

Simulation Time Simulink

Thanks Pablo

[Ankita Bansal]

"simulation actually last 8 sec"

Hi Pablo, simulation is running for 4 to 12 secs (for 8 secs duration). And the graph you are getting is also for 4 to 12 secs, it's just shifted by 4 secs. (4->0 and 12 ->8)

So (x,y) point in the graph actually corresponds to (x+4,y).

Answer 3

[Pablo Panitta]

Hi Ankita, first thank for keep helping me in this. Unfortunatelly I don´t see the same what you´re seeing.

Picture 1: Complete simulation time Tstart=0, Tstop=12

Picture 2 : Partial simulation time Tstart=4 , Tsopt=12.

The only difference I see is the time finish, but partial simulation is not starting at 4 sec, but 0 sec, which is what I try to avoid.

Thanks Pablo