Hi Ankit, Can you provide a quick guide to obtaining and installing the requisite C++ compiler? What was on the Mathematica site wasn't easy enough for me. I'm not at all familiar with that. I presume it is free? Thank-you.

There are different types of connectors in one domain (i.e. flangea resp flangeb in the mechanical translational domain). Could you please explain which connector has to be connected to which connector? For example: what is different when flangeb of a spring is connected to flangeb of a mass in comparison when flangeb of a spring is connected to flangea of a mass? There is also an arrow shown in the icons of Mechanics-Translational-Models. For example at the Mechanic-Translational-Model Spring and Mass and Damper and ElastoGap the arrow is always directed from a flangea to flangeb. What is the purpose or the concept behind this arrow?

Hi Sergio - thanks. That was what i was looking for. RTFM helps more often than not.

Ex 4 Pendulum. Y(x) plot of pendulum.r[1], pendulum.r[2] results in horizontal line pendulum.r[2]=0 for range -222e-18< pendulum.r[1]<+222e-18. Is there an instruction in the training I missed?

I can show it again during the review session today.

Yes

Thanks, Was watching you in today's review session, I must have missed it. Model looks exactly like the exercise sheet 3. "Create components and animations Exercise 4 Pendulum" On simulation the animation shows a swinging pendulum Y[x] plot show nothing. time plot shows r2[t]=1 constant r1[t]=0 constant. What might be wrong?

Not clear to me what this means ...

Drag and drop the new Car dynamics graphic over the old one. The F1 car has changed its behavior.

Help > Documentation Center > Simulation Center - Plot Windows had nothing to say about this.

Help?

Can you help me understand In[23] failed? I tried both with and with out system model GUI launched, with the same result.

In[23]:= CreateSystemModel["WSMExercises.Ex7.MyModels.Wingnut", wingnut];

In[24]:= SystemModel["WSMExercises.Ex7.MyModels.Wingnut", "ModelicaDisplay"]

During evaluation of In[24]:= SystemModel::nomod: The model WSMExercises.Ex7.MyModels.Wingnut was not found.

Out[24]= SystemModel["WSMExercises.Ex7.MyModels.Wingnut", "ModelicaDisplay"]

Are you using Mathematica 12.2 as well? I suspect the Mathematica instance is not able to connect to System Modeler.

Try running this in a new Mathematica instance:

Needs["PacletManager`"];
PacletDirectoryLoad["/path/to/your/SystemModeler/Mathematica/"];
RebuildPacletData[]

and then run this:

SystemModeler[{"WSMExercises.Ex6.MyModels.Inerter"}]

Maybe that sentence is better understood after watching you in the lesson, which my good fortune didn't permit in these dreadfully busy times. Achieved the same graph as in the notebook by dragging "car dynamics" from the plot area of the "pinned" simulation ... onto the car dynamics graph created from the simulation with the inerter. Which seems different than the wording in the notebook.

Hi John,

Please drop me a mail at ankitn@wolfram.com and we can schedule a zoom meeting to troubleshoot this issue.

Thanks, Ankit

This particular CreateSystemModel problem may be independent of the issue with the link to System Modeler. @John Burgers could you close all your wolfram applications, open Mathematica and run the following:

SystemModelSimulate["IntroductoryExamples.HelloWorld"]

Looking at the output might give us some information on whether there is a deeper issue with your setup not allowing us to run the executables that correspond to a built model. Then, can you run

CreateSystemModel["MyBall", Ball[]]

Does this return the unevaluated CreateSystemModel function call or does it return a SystemModel? My suspicion is that in your wingnut call, the symbol wingnut was somehow not set to the corresponding shape and the model was not created at all. So if this works, then it would be worth checking the wingnut shape was used properly in the original question. If this does return a SystemModel then could you try

SystemModel["MyBall","ModelicaDisplay"]

Conventionally, if the model exists, this should return a display, regardless of whether your link to System Modeler is working or not. Let us know how this goes.

Apology for so many questions from me, perhaps one of the few newbies on the topic. Also was too busy to attend the thermal modellng session.

My question, the assignment asks to change the walls with "Ventilation" components. But I don't find such a component in "College thermal" nor by query of the packages which i've so far installed, Modellica, Modellica services, ModelPlug, Complex

Thanks for any tips.

The "Ventilation" component is simply an instance of "ThermalConductor" component from the Modelica->Thermal->HeatTransfer->Components package.

Session recordings from the Study Group can be watched from the webinar landing pages. (Registration is required.).

Dear Ankit,

Why if I carry out the following simulation command doesn't work

In[5]:= SystemModelPlot["WSMExercises.Ex3.MyModels.ElectricKettle"]

it complains with: "SystemModelPlot::nov: A list of variables to plot is required." But the simulation is correct because

In[8]:= SystemModelPlot["WSMExercises.Ex3.MyModels.ElectricKettle", "water.T"]

returns the correct plot. Even thought if I execute the solutions example

In[9]:= SystemModelPlot["WSMExercises.Ex3.Solutions.ElectricKettle"]

it is not mandatory to say "water.T" variable I don't understand why. Thanks for any clue. Regards,

Yes, you are correct. The right answer is 1.7 mol/l. I will fix it tomorrow.

Thank you, Ankit. Bob

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