modelica Questions
2
Solved
I wanted to do the following in Modelica: in a specific model I have several parameters h and I want to deduce some time independent values k from them by solving a set of implicit equations betwee...
Arcane asked 7/2, 2019 at 17:21
2
Solved
I noted numerical issues integrating a pulse input that is delayed by a fixed amount of time in Modelica (using Wolfram System Modeler 4.3):
model PulseTest "Test FixedDelay with Pulse Input";
...
Dellinger asked 10/12, 2018 at 16:41
2
Main goal
Sensitivity analysis of a district heating network.
Approach
Modelica model of the system (in Dymola) using the AixLib and BuildingSystem libraries
Export model as FMU co-simulation
U...
3
This question has two main aspects actually. Right at the beginning, I have to admit that I am totally new to physical modeling and would be glad to be corrected as well, not only be answered. For ...
Traumatize asked 11/9, 2017 at 11:47
1
In Modelica I'm trying to define a dedicated data type OrifSizingCoeff for the sizing coefficient on an hydraulic orifice.
The corresponding physical quantity is a volumetric flow rate divided by t...
Gannet asked 29/9, 2017 at 14:52
3
I have an OpenModelica model made with OMEdit. In order to get a concrete example I designed the following:
Now I would like to run the model in Python. I can do this by using OMPython. After im...
Corrinnecorrival asked 7/1, 2014 at 7:49
3
Solved
I am attempting to define the parameter of a model (block) as a variable. For example:
Real WallThickness = 0.5;
Real WallConductance = 10*WallThickness;
Modelica.Thermal.HeatTransfer.Components.T...
1
I would like to understand the general idea behind hybrid modelling (in particular state events) from a numerical point of view (although I am not a mathematician :)). Given the following Modelica ...
Kat asked 26/3, 2017 at 9:57
2
Solved
I am trying to add measurement noise to a simulation. This is possible to do in for example Simulink but seems to be more difficult in Modelica and SystemModeler.
Any ideas on how to do this?
Swashbuckling asked 18/2, 2013 at 19:34
5
Solved
I'm struggling with the size of output files for large Modelica models. Off course, I can protect some objects in order to remove them completely from the result file. However, that gives rise to t...
Higginbotham asked 28/9, 2011 at 12:55
1
Solved
At work I use git as a version control system and Dymola for modeling and simulation.
One major Issue I have is that once I touch or by mistake move a connection (more exactly the position of a pa...
4
Solved
I'm creating a library of components in Modelica, and would appreciate some input on techniques for unit testing the package.
So far I have a test package, consisting of a set of models, one per c...
Dispart asked 22/3, 2016 at 14:31
1
Solved
Having run out of ideas again I turn to you.
I'm sure this has to have been answered before though for the life of me I can't find a clear description of it.
Scenario:
You work hard to get a mod...
Benavides asked 7/1, 2016 at 17:27
1
Solved
Is it possible to simulate multi-agent systems in Modelica? I'm talking about a system such MASON written in Java. How easy or difficult it would be?
As I understand, Modelica is not a typical prog...
Telic asked 19/9, 2015 at 5:47
0
Is the non-discrete assignment of expressions to integers only possible within the algorithm of a function?
If many model parameters are needed within the algorithm it would be much simpler to cal...
Flense asked 27/6, 2015 at 23:2
1
My research group has developed python code for a new building component that we would like to co-simulate with EnergyPlus. For reuseability and market impact we would like this connection to be as...
Inverter asked 8/6, 2015 at 19:36
2
Solved
I wonder if there a way to "debug" a modelica code, I mean debugging the code line by line and you can see how variables change, things like that?
I know that the modelica code is translated into...
3
Solved
I want to use non-SI units in a Modelica model in a medical context. I am using Modelica in Dymola. Being an engineer I prefer the SI units. But my model parameters are sourced from medical publica...
1
Solved
I would like to place a "System" component in my simulation (similar to Modelica.Fluid.System and Modelica.Mechanics.MultiBody.World) from which all other components can access the Medium package, ...
Hulton asked 13/6, 2014 at 14:21
1
Solved
For example, I have a multibody vehicle model with an initial height of, say 0.1 meter (all wheel vertical loads = 0), as the sim runs, the vehicle will drop onto the ground, after 10 seconds, it r...
Talebearer asked 11/3, 2014 at 19:43
3
Solved
I am trying to build a model that will have slightly different equations based on whether or not certain components exist (in my case, fluid ports).
A code like the following will not work:
param...
Dissolvent asked 3/2, 2013 at 1:12
1
Solved
Equation section : declarative
Algorithm section : imperative
Can anyone help me with examples that show the difference between these two sections in Modelica Language? When to use what section...
Gannie asked 19/11, 2013 at 17:39
1
Solved
I would like to perform integration of a function of a variable other than time in Modelica, but I don't know how to do it.
For example, how can I evaluate the integral of x dx with upper limit 5 a...
Herzog asked 9/5, 2013 at 8:47
1
Solved
I would like to model an explictly time dependent differential equation in Modelica.
Say I would like to model
Real x(start=1);
der(x) = t;
in Modelica. What is the correct way to access the ...
Rib asked 5/8, 2011 at 22:7
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