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<font size="+1">Hmm... batteries: Charge storage devices which have
a largely constant voltage in the working range but which show big
changes in apparent voltage when they reach full charge and when
the charge drops very low. You don't get all the electrons back.
I suspect a really good model would relate these effects to the
electrochemical processes at work. Also because they are
"batteries" and not individual cells, the aggregate behaviour
will depend on the whole (in series) set. <br>
With a sort of diodes and resistors model for the charge and
discharge routes (somewhat different characteristics), it is
possible to make a fair model for a battery's functional
operations but I'd be a bit concerned if it was to try to make
predictions of behaviour under stress (e.g.very high discharge
rates) or temperature changes (which in lead acid batteries reduce
apparent capacity and ability to deliver current). There's an
industry emerging for batteries with all the associated support
equipment for creating backups for solar power etc.<br>
So it becomes a question of how deep you want to go into the
physics.<br>
<br>
Mike.<br>
<br>
=====================<br>
</font>
<div class="moz-cite-prefix">On 12/04/2017 16:02,
<a class="moz-txt-link-abbreviated" href="mailto:tim@wescottdesign.com">tim@wescottdesign.com</a> wrote:<br>
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<p>I strongly suspect that anything that would be useful would be
specific to batteries, and would perhaps be best done in batch
mode to generate a model that is then hand-tweaked and selected
for use in xcos -- but I say that in part because over the years
I've come to dislike graphical solvers.</p>
<p>I think it's possible to build a subsystem out of blocks that
can be "masked" so that you can enter parameters in the usual
way -- if you could boil your battery model down so that it had
a few parameters, you could translate your measured data into
parameters once, then use parameterized blocks for the battery
behavior.</p>
<p>On 2017-04-12 07:49, phillip mobley wrote:</p>
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<div dir="ltr">Sure thing Tim,
<div> </div>
<div>Thank you for pointing out those details. I will share as
much as I can.</div>
<div> </div>
<div>I am simulating the behavior of a battery as it is
discharging into a circuit. I recorded data from the battery
(for example, the voltage and current and internal
resistance) during testing. I currently have the data at
different time steps inside of an excel file.</div>
<div> </div>
<div>I would like to test this battery under different circuit
configurations. However, changing the circuit can be time
consuming and expensive. I was thinking that I could use
xcos ability to do circuit simulation to construct a basic
model of the battery that I am using that utilizes the data
that I gathered. This way I can simulation the battery under
different circuit configurations very easily.</div>
<div> </div>
<div>So I was wondering if there was a way that I could import
my data into xcos to construct a model for simulation.</div>
<div> </div>
<div>I actually created the system to simulate the battery.</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Apr 11, 2017 at 3:48 PM, Tim
Wescott <span><<a moz-do-not-send="true"
href="mailto:tim@wescottdesign.com">tim@wescottdesign.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0 0 0 .8ex;
border-left: 1px #ccc solid; padding-left: 1ex;">"Simulate
the data"?<br>
<br>
Surely you mean you wish to simulate the system which was
used in the<br>
measurement!<br>
<br>
You don't give much detail, but I suspect that what you
want to do is<br>
to develop a model of the system that fits the experiment,
and then use<br>
that model in your simulations.<br>
<br>
The general term for generating the model is called
"system<br>
identification", but that covers a pretty broad swath.<br>
<br>
Can you share the test you did, the sort of data you
collected, the<br>
sort of system you're trying to model, and how well you
know the system<br>
itself?<br>
<div>
<div class="h5"><br>
On Tue, 2017-04-11 at 15:10 -0400, phillip mobley
wrote:<br>
> Hello all,<br>
><br>
> I have some data from a test that I preformed. I
was looking to<br>
> simulate this data under different conditions and
I was wondering if<br>
> there is a palette in xcos that would allow me to
input data (maybe<br>
> from an excel spreadsheet or copy paste) in order
to use in the<br>
> simulation?<br>
><br>
> Is this possible with xcos?</div>
</div>
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--<br>
<br>
Tim Wescott<br>
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href="http://www.wescottdesign.com">www.wescottdesign.com</a><br>
Control & Communications systems, circuit &
software design.<br>
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<pre class="moz-signature" cols="72">--
Dr.M.J.McCann,MJMcCann-Consulting
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