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From: Punit on 21 Jun 2010 22:38
Hello all,
I have a SimHydraulics model which is stiff, so I'm using ode15s to solve the model. I want to compare the outputs of same model for a small change in a parameter (e.g. valve area). The problem is, the lengths of outputs (resultant force) for nominal parameter value and perturbed parameter are not the same, hence I can not compare the two outputs. Also I can not use the fixed time step integrator for this model. Earlier, when I had mathematical equations for the model, and I could input the time step for ode15s() solver.
Is there any way of obtaining the outputs at specific time steps from a stiff model?
I'm using " to workspace" block for getting the output in workspace.
Thanks
Sincerely,
-Punit
From: Torsten Hennig on 21 Jun 2010 22:56
> Hello all,
> I have a SimHydraulics model which is stiff, so I'm
> using ode15s to solve the model. I want to compare
> the outputs of same model for a small change in a
> parameter (e.g. valve area). The problem is, the
> lengths of outputs (resultant force) for nominal
> parameter value and perturbed parameter are not the
> same, hence I can not compare the two outputs. Also I
> can not use the fixed time step integrator for this
> model. Earlier, when I had mathematical equations for
> the model, and I could input the time step for
> ode15s() solver.
> Is there any way of obtaining the outputs at specific
> time steps from a stiff model?
> I'm using " to workspace" block for getting the
> output in workspace.
> Thanks
> Sincerely,
> -Punit

http://www.mathworks.com/access/helpdesk_r13/help/techdoc/ref/deval.html

Best wishes
Torsten.
From: Punit Tulpule on 22 Jun 2010 10:05
Torsten Hennig <Torsten.Hennig(a)umsicht.fhg.de> wrote in message <1633707539.6590.1277189813281.JavaMail.root(a)gallium.mathforum.org>...
> > Hello all,
> > I have a SimHydraulics model which is stiff, so I'm
> > using ode15s to solve the model. I want to compare
> > the outputs of same model for a small change in a
> > parameter (e.g. valve area). The problem is, the
> > lengths of outputs (resultant force) for nominal
> > parameter value and perturbed parameter are not the
> > same, hence I can not compare the two outputs. Also I
> > can not use the fixed time step integrator for this
> > model. Earlier, when I had mathematical equations for
> > the model, and I could input the time step for
> > ode15s() solver.
> > Is there any way of obtaining the outputs at specific
> > time steps from a stiff model?
> > I'm using " to workspace" block for getting the
> > output in workspace.
> > Thanks
> > Sincerely,
> > -Punit
>
> http://www.mathworks.com/access/helpdesk_r13/help/techdoc/ref/deval.html
>
> Best wishes
> Torsten.

Thanks,
-Punit
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