Femyou

loading and running fmi-standard FMUs in dotnet core

The binary package is available from NuGet

Features

This is a limited implementation of the fmi-standard.

Available features :

• Load FMU model
• Get model variables
• Create co-simulation instance
• Read and write variable values from instance
• Simulate by advancing time

The features are verified with the reference FMUs.

Example

using var model = Model.Load("BouncingBall.fmu");
var height = model.Variables["h"];
var velocity = model.Variables["v"];
double h = 60.0, v = 0.0;
using var instance = model.CreateCoSimulationInstance("demo");
instance.WriteReal((height, h), (velocity, v));
instance.StartTime(0.0);
while (h > 0 || Math.Abs(v) > 0)
{
  var values = instance.ReadReal(height, velocity).ToArray();
  h = values[0];
  v = values[1];
  instance.AdvanceTime(0.1);
}

Demos

The Bouncing Ball reference FMU visualized with GIF animation.

Troubleshooting

Here are some mistakes I've made, maybe they can help you:

Unhandled exception. System.IO.FileNotFoundException: Could not find or load the native library: BouncingBall.fmu\binaries\win64\BouncingBall.dll

This most likely because you build it for the wrong architecture, make sure that you build for your platform.

Couldn't load MOS files

Make sure they are in your working directory (in this case it would be demos/BouncingBallGif/bin/Debug/net5.0/)