Hi DFE,
Thanks for your question about dynamic modelling with ASCEND. The
'ode_id' syntax in ASCEND is something that also causes me annoyance, so
you will be pleased to know that we have a student, Ksenija, working on
improved syntax for DAE modelling in ASCEND.
http://ascend4.org/User:Ksenija
Your immediate option here, as a kludge, would be to create the chained
first-order models in an array, and then to set the ode_id values using
a FOR loop inside a method. Alternatively, you could set a constant for
each chained submodel (:== operator) from which you could locally
calculate the needed ode_id.
Our planned new syntax will eliminate this annoying step, hopefully we
will have something better by September or so. As well as the new
syntax, we are working to add generalised event
handling/reinitialisation for DAE simulations, which will be helpful for
step and ramp responses, etc. Currently, reinitialisations must be
handled manually or via methods.
Please let me know if I need to expand on how to go about the suggested
workaround.
Cheers
JP
On 19/06/12 17:20, Daikokuten Eudaemon wrote:
Ascendians,
There are two files attached to this message: dfe_dyn_FO.a4c and
dfe_dyn_FO_FO_InSeries.a4c. The dfe_dyn_FO.a4c models a first order
plant whereas the dfe_dyn_FO_FO_InSeries.a4c models two such plants
connected in series. What I find repelling about the
dfe_dyn_FO_FO_InSeries.a4c is the fact that in the "METHOD on_load"
it contains the following two lines of code:
B2.dy_dt.ode_id := 2;
B2.y.ode_id := 2;
I have been unable to integrate dfe_dyn_FO_FO_InSeries.a4c without
these two lines cited above. IMHO, this is just a kludge as these two
unfortunate lines simply manually coerce the dynamics of each of the
two first order plants into one system. Is there a more elegant way to
connect two (not to mention two hundred twenty two, for example)
dfe_dyn_FO.a4c in series?
Regards,
DFE
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