Functional Mock-Up Interface (FMI) - Tool independent standard to support both model exchange and co-simulation of dynamic models

1. FMI TUTORIAL
John Batteh
Modelon Inc.
North America Modelica User’s Group
September 28-29, 2016
Troy, MI
2016-09-28 © Modelon

2. AGENDA
2016-10-11 © Modelon
• FMI Overview
• Tutorial Overview
• Hands-on Exercises
2

3. FUNCTIONAL MOCKUP INTERFACE (FMI)
• Tool independent standard to support both model exchange and co-
simulation of dynamic models
• Original development of standard part of EU-funded MODELISAR
project led and initiated by Daimler
• First version FMI 1.0 published in 2010
• FMI currently supported by more than 85 tools
(see www.fmi-standard.org for most up to date list)
• Active development as Modelica® Association project
• FMI 2.0 released July 2014 and brings additional functionality to FMI
standard
32016-10-11

4. Combined simulation for system integration
Solution
 As a universal solution to this problem the Functional Mockup
Interface (FMI) was developed by the EU-project MODELISAR, and is
now maintained by the Modelica® Association
USE CASE I:
?
supplier1 supplier2 supplier3 supplier4 supplier5
OEM
supplier1
tool 1
supplier2 supplier3 supplier4 supplier5
tool 2 tool 3 tool 4 tool 5
FMI OEM
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5. USE CASE II:
• Combine different modeling formats into
coherent co-simulation (cyber-physical systems)
 Physical models, 1D-3D
 Controls / Software
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FEA
CFD
Modelica /
1-D Systems Simulation
FMI-based System Simulation
Block Diagrams
Controls

6. USE CASE III: VIRTUALIZATION FOR CONTROLS
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7.  The Functional Mock-up Interface (FMI) is a tool independent
standard for
 Model Exchange (ME)
 Co-Simulation (CS)
 The FMI defines an interface to be implemented by an executable
called Functional Mock-up Unit (FMU)
FMI FLAVORS
Tool
Solver
FMU
Model
Tool
FMU
Model
Solver

8. WHAT IS AN FMU?
• Component which implements the FMI standard is called
Functional Mockup Unit (FMU)
• Zipped file (*.fmu) containing the XML description file and
the implementation in source or binary form
• Separation of description of interface data (XML file) from
functionality (C code or binary)
• Additional data and functionality can be included
• Information and interface specification: www.fmi-
standard.org
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9. ENSURING COMPATIBILITY
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https://www.fmi-standard.org/tools

10. FMI: A BUSINESS MODEL INNOVATION
• FMI-compliant tools often allow liberally licensed
export of models for distribution in the
organization
• Exported FMU’s most often don’t require a license
from the model authoring tool
• Deployment from few simulation specialists to
designers, domain specialists, control engineers
• One FMU used by many engineers (control design)
• One FMU run on many cores (robust design)
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11. FMI: A BUSINESS MODEL INNOVATION
1. Separate the model authoring tool
from the model execution tool!
2. Free the model unit (FMU) from
license restrictions
3. Make the standard widely accepted:
https://fmi-standard.org/tools
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12. IP PROTECTION
• FMUs contain compiled code
• FMU creator controls level of openness
 Internal variables
 Parameters
 Inputs and outputs only
• Suitable for sharing between OEMs and suppliers
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13. TYPICAL FMI-BASED WORKFLOWS
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Model Authoring Tool(s)
Low-cost Model Execution Platform
May combine FMUs from several tools
Export: exported
FMU freely licensed
• Additional work flow automation for
 pre-processing,
 model calibration,
 post-processing,
 analysis,
 automated reporting
 automated requirements verification
• True democratization
of simulation
• Greatly improved
utilization of models

14. DEVELOPMENT TO DEPLOYMENT
14
FMU Export
via Model
Export
PyFMI
Parameters
Results
Functional Mockup Interface (FMI)
FMU Simulator
Custom GUI
2016-10-11

15. 15
ALL CONNECTED!

16. PART II
Tutorial Overview

17. TUTORIAL OVERVIEW
• Goal: demonstrate FMI-based workflows in several FMI
compliant tools with hands-on exercises
 Modelica models (vehicle thermal management, vehicle,
cooling loop)
 FMU creation (Dymola, MapleSim)
 FMU import, simulation, and post-processing
• FMI is a standard but we need tools to work with it
• Several tools are provided to support tutorial, both open
source and commercial (evaluation licenses)
• Choose exercises based on interest and tools (note some
have tool pre-requisites, i.e. MATLAB/Simulink)
• FULL DISCLOSURE: tutorial based on tools in use at
Modelon (full list of FMI-compliant tools at www.fmi-
standard.org)
2011-09-30 © Modelon EFD

18. TUTORIAL USE CASE
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19. TUTORIAL USE CASE: VEHICLE
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20. TUTORIAL USE CASE: COOLING LOOP
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21. GETTING STARTED
• USB sticks passed around with all tutorial files
(instructions, software, licenses, sample files, FMUs)
• Open FMIWorkshop.pdf with full tutorial instructions
• Feel free to try your own FMI tools with workshop
• Ask questions if you need help or have problems
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22. LICENSING LOGISTICS
• Dymola
 Full Dymola license required for FMI import and export
• MapleSim
 Contact MapleSoft representatives
• MATLAB/Simulink
 FMI Toolbox (evaluation license provided) + MATLAB/Simulink
required for FMU import into Simulink
 FMU export from Simulink also requires Simulink Coder
• Excel
 FMI Add-in for Excel (evaluation license provided)
 Requires 32 bit Microsoft Office due to 32 bit FMUs
• Evaluation licenses expire on October 3, 2016 but all FMUs
included with tools execute with demo licenses per Users’ Guide
(contact Modelon for more information)
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23. FMI VIDEOS
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Modelon YouTube Channel
https://www.youtube.com/results?s
earch_query=modelon
FMI Tech Day Replay
http://www.modelon.com/campaigns/2013-fmi-detroit/

24. john.batteh@modelon.com, (734) 274-5933
THANK YOU FOR YOUR ATTENTION