[Scilab-users] Xocs : enabled superblocks and multi frequence diagram

[Serge Steer]

The solution of your problem depends the solution of your problem 
depends on the type of your state system:

- if it is a continous time state system  the xcos solver is able to 
automatically adapt its step size so, it is not necessary to handle two 
copies of your superblock
- if it is a discret time system you can use two SampleCLK block one 
with 1/10 period and the other one with 1/1000 period as explained in 
the attached xcos diagram

Serge Steer
Le 21/07/2014 08:45, Quentin Mazué a écrit :
> Hello,
>
> I need to model a special phenomenon which has two different states:
>
> ->1) A transient state: from 0 to 1 sec.
> For this phase I need calculations with a very small time step (around
> 0.001s)
>
> ->2) Then a steady state: from 1 to end of simulation (around 10-15sec)
> For this phase I need calculations with a large time step (0.1s)
>
> Enclosed, a picture of an equivalent Simulink diagram which matches my
> needs.
>   
> Illustration_EnabledSuperblocks_MultifreqDiagram.png
> <http://mailinglists.scilab.org/file/n4030940/Illustration_EnabledSuperblocks_MultifreqDiagram.png>
>
> Both phases have the same inputs calculated with the same block.
>
> I would like to:
>
> ->a) Specify that I have 2 superblocks within the same Xcos diagram that
> make the computations with different time step and a third one with a time
> step which change during the simulation (the Input superblock)
>
> ->b) be able to deactivate the transient superblock when I don’t need
> transient calculations and activate the steady block only when I need it.
>
>
> Why I would like to do that?
>
> ->I’m working with a new way of computing a phenomenon and I have to show
> that this new method is faster than the previous method and enough accurate.
> If I don’t deactivate the transient block, Xcos is still running this block
> and I lose all the interest of my new model.
>
> ->at the same time, I have to show that Scilab/Xocs is able to match the
> need of my company. They are actually using a lot Matlab/Simulink,
> especially the blocks: enabled subsystem, triggered subsystem, trigger, zero
> order hold, rate transition,…
>
>
>
> Thanks for your help
>
> Quentin Mazué
>
>
>
>
> --
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