[Scilab-users] Problems with Scilab- Xcos simulations (Algebraic loop / Derivative block).

[Stéphane Mottelet]

The system described in your EDOS.ps file can be written in implicit form,

A*[dy1/dt; dy2/dt] = F(y1,y2)

but here you have A =[1 -1; -2 2], i.e. A is singular. I am not sure 
that; at least under this form, your system is well-posed.

S.

Le 08/04/2019 à 22:13, Marcus Vinicius Pereira de Souza a écrit :
> Dear all,
> I'm trying to do a simulation involving a system of ordinary 
> differential equations. However, in working out the block diagram, I 
> came across an algebraic loop problem.
>
> To solve this problem, I made a new arrangement of the equations and 
> then it was necessary to include a derivative block.
> Two new problems have appeared: 1) the initial value of the output 
> signal does not match the value obtained by the initial value theorem 
> and 2) the signal has a strong oscillation (probably due to high 
> frequencies).
> Can anyone help me solve these issues? Attached, the. Thank you very much.
>
>
>
>
> --
> Marcus Vinicius Pereira de Souza, D.Sc. (Eng.)
> Prof. do Ens. Bas. Tec. Tecnológico
> CEFET/RJ | Campus Valença-RJ
> Cel: +55 32 9 8436 9695 (TIM - Wapp)
> /http://lattes.cnpq.br/1549590151077934/ 
> <https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lattes.cnpq.br/1549590151077934>
>
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