decrease the mat file size of Dymola result

Question

The result of Dymola simulation is .mat file, which might be very big. Here is a series of results of a Power plant model, the simulation time interval is 0-100000s, but I only need the data during 90000 to 100000s, so is there any way to let Dymola only output the data of 90000 to 100000s?

score 6 · Accepted Answer · answered Oct 14 '21 at 14:28

There is a section called "Variable frequency of output points" in the Dymola User manual. There you'll find an explanation on how Advanced.Simulation.VariableInterval=true and statements like

when time >=… then
  Dymola.Simulation.SetOutputInterval(…);
end when;

will enable you to set the output interval depending on the simulation time.

The example shown there is:

model VariableOutputInterval "demonstrate the use of variable output interval in a model"
  Real x;
equation
  x = sin(10*time);
  
  when initial() then
    Dymola.Simulation.SetOutputInterval(0.1);
  end when;

  when time >= 0.5 then
    Dymola.Simulation.SetOutputInterval(0.05);
  end when;

  when time >= 1.1 then
    Dymola.Simulation.SetOutputInterval(0.002);
  end when;
end VariableOutputInterval;

Also there are two notes:

The only way to “reset” the interval length to the one in the simulation setup is to explicitly set that interval, this is done in the last when statement above.
You must have a separate when statement for each time.

decrease the mat file size of Dymola result

1 Answers1