FMPy

FMPy is a free Python library to simulate Functional Mock-up Units (FMUs) that...

• supports FMI 1.0, 2.0, and 3.0
• supports Co-Simulation and Model Exchange
• runs on Windows, Linux and macOS
• has a command line, graphical user interface, and web app
• creates Jupyter Notebooks
• compiles C code FMUs and generates CMake projects for debugging

Installation

Several options are available:

• Install with conda: conda install -c conda-forge fmpy
• Install with from PyPI: python -m pip install fmpy[complete]
• Install a development build

If you don't have Python on your machine you can install Miniforge.

Start the Graphical User Interface

You can start the FMPy GUI with python -m fmpy.gui

Simulate an FMU in Python

To follow this example download Rectifier.fmu for your platform by clicking on the respective link: Linux, macOS, Windows. Change to the folder where you've saved the FMU and open a Python prompt.

>>> from fmpy import *
>>> fmu = 'Rectifier.fmu'
>>> dump(fmu)  # get information

Model Info

  FMI Version       2.0
  Model Name        Rectifier
  Description       Model Rectifier
  Platforms         win64
  Continuous States 4
  Event Indicators  6
  Variables         63
  Generation Tool   MapleSim (1267140/1267140/1267140)
  Generation Date   2017-10-04T12:07:10Z

Default Experiment

  Stop Time         0.1
  Step Size         1e-07

Variables (input, output)

Name                Causality          Start Value  Unit     Description
outputs             output        282.842712474619  V        Rectifier1.Capacitor1.v
>>> result = simulate_fmu(fmu)         # simulate the FMU
>>> from fmpy.util import plot_result  # import the plot function
>>> plot_result(result)                # plot two variables

Simulate an FMU on the command line

To get information about an FMU directly from the command line change to the folder where you've saved the FMU and enter

fmpy info Rectifier.fmu

Simulate the FMU and plot the results

fmpy simulate Rectifier.fmu --show-plot

Get more information about the available options

fmpy --help

Create a Jupyter Notebook

To create a Jupyter Notebook open an FMU in the FMPy GUI and select Tools > Create Jupyter Notebook... or run

fmpy create-jupyter-notebook Rectifier.fmu

on the command line and open the notebook in Jupyter with

jupyter notebook Rectifier.ipynb

Start the Web App

The FMPy Web App is built with Dash and a great way to share your FMUs with anyone that has a web browser. To start it run

python -m fmpy.webapp Rectifier.fmu

on the command line or use --help for more options.

Advanced Usage

To learn more about how to use FMPy in you own scripts take a look at the coupled_clutches.py, custom_input.py and parameter_variation.py examples.

Commercial Support

You're starting a project, need training or professional support? Our partners at LTX Simulation are ready to help you. Please send an e-mail to support@ltx.de for a quote.

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